Techniques to Increase Energy Density of LFP Batteries for EVs

Lithium secondary battery with enhanced high-temperature performance through the use of a non-aqueous electrolyte containing specific additives. The battery comprises a lithium iron phosphate (LFP) positive electrode with a composite oxide active material, and a non-aqueous electrolyte that includes a lithium salt, an organic solvent, a first additive represented by the chemical formula 1, and a second additive represented by the chemical formula 2. The electrolyte contains 2% or less of the first additive and 2% or less of the second additive. This non-aqueous electrolyte provides improved thermal stability and resistance to electrode degradation compared to traditional aqueous electrolytes.

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A lithium iron phosphate positive electrode material and method that enhances electrochemical performance through a novel graphene-based interface layer. The material comprises positive electrode particles with a graphene coating layer comprising lithium carbonate and boron-doped graphene. The graphene layer is formed through a controlled dehydrogenation process in a protective atmosphere, ensuring precise control over the reaction conditions. This composite layer provides improved conductivity and interface stability compared to traditional carbon coatings, enabling enhanced fast charge/discharge performance and long cycle stability in lithium iron phosphate batteries.

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Lithium iron phosphate battery with enhanced energy density and fast charging capabilities through optimized electrode design. The battery features a positive electrode with a surface density of 23 mg/cm^2, a negative electrode with a surface density of 24 mg/cm^2, and a separator. The design incorporates a novel electrolyte composition that balances conductivity, wettability, and electrolyte density to achieve the battery's high energy density and fast charging performance.

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Nonaqueous electrolyte energy storage device with enhanced capacity retention and resistance management. The device utilizes lithium iron phosphate as the positive electrode material, with graphite and non-graphitic carbon as the negative electrode materials. The electrolyte composition is optimized to achieve high capacity retention after repeated charge-discharge cycles while maintaining low internal resistance increase rates. The electrolyte contains lithium hexafluorophosphate at concentrations of 0.7 mol/dm3 or less, with specific ratios of LiFSI to LiPF6 ranging from 50:50 to 99:1.

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A hybrid lithium-sodium ion battery combining lithium iron phosphate (LiFePO4) cathodes with iron-based polyanion cathodes. The battery features a positive electrode comprising LiFePO4, with one or more iron-based polyanion cathodes, and a conductive additive. The cathode material is optimized for conductivity while maintaining high energy density and power density. The battery achieves superior performance through the synergistic effect of both lithium iron phosphate and iron-based polyanion cathodes, with the conductive additive enhancing conductivity.

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A modified lithium iron phosphate cathode material for lithium-ion batteries that enhances their performance through a novel three-dimensional carbon network structure. The material comprises a lithium iron phosphate cathode with a 1-5% carbon content, where the carbon network is formed through a process that integrates 3D network precursors with lithium iron phosphate precursors. This structure enables the material to achieve improved electronic conductivity while maintaining its unique olivine-type iron phosphate structure, thereby enhancing the overall performance of lithium-ion batteries.

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Graphene-encapsulated lithium iron phosphate (LiFePO4) composite material for lithium-ion batteries, prepared through a novel solvothermal synthesis method. The synthesis process involves the controlled nucleation of graphene onto iron source particles, followed by reaction with lithium and phosphorus sources under high-temperature solvothermal conditions. The graphene serves as a nucleating agent, facilitating the formation of the LiFePO4 composite through controlled graphene-iron interactions.

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Positive electrode for lithium secondary batteries with enhanced stability against overcharge-induced gas generation and thermal runaway. The electrode features a double-layer structure comprising a first positive electrode active material layer on the collector and a second positive electrode active material layer on the first layer. The second layer incorporates lithium carbonate or lithium oxalate, which generates gas during overcharge. The electrode's design prevents the formation of a gas-filled path through the double-layer structure, thereby preventing thermal runaway and enabling reliable operation at high charge levels.

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A polymer lithium-ion battery negative electrode with improved energy density and fast charging capabilities. The battery features a novel negative electrode structure where the active material layers are selectively coated with different lithium intercalation potentials in the thickness direction. This enables optimized lithium insertion during both charging and discharging, achieving both high energy density and fast charging. The active material layer with the higher lithium insertion potential is positioned near the cathode, while the lower-intercalation potential layer is positioned near the anode.

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Lithium iron phosphate battery with improved performance and safety characteristics through a multi-pole structure that enhances current density, reduces thermal management issues, and prevents electrolyte degradation. The battery cell incorporates a multi-pole design that increases the current conduction area while maintaining thermal stability, preventing hot pressing-related issues and side reactions. The cell architecture also features a diaphragm made of a PE-wet-coated ceramic material and a carbon-coated aluminum foil positive electrode current collector. The battery achieves higher performance and safety through these innovative structural elements.

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Lithium iron phosphate (LiFePO4) cathode material with improved conductivity and operating voltage range through controlled doping of iron and manganese sites. The material, synthesized through a novel milling process combining In2O3, Fe2O3, MnO2, and P source dispersion with ball milling, pre-sintering, and cooling, achieves consistent doping uniformity and stable performance while maintaining the material's inherent electrochemical properties.

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Lithium iron phosphate power battery that maintains charge-discharge performance at low temperatures and cycles well. The battery incorporates a positive electrode with a graphene coating on lithium iron phosphate particles, and a negative electrode comprising natural graphite and modified graphite. The graphene coating enhances lithium ion conductivity and diffusion, while the graphite components maintain high capacity. The battery achieves excellent low-temperature performance and cycle life through the optimized electrode structure, enabling continuous use of electric vehicles at temperatures below 25°C.

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A method for preparing a reduced graphene oxide/carbon coating/lithium iron phosphate composite material that addresses the issues of uneven graphene dispersion and agglomeration in conventional composite formulations. The method involves a controlled reduction of graphene oxide to form a uniform dispersion of graphene particles in a carbon matrix, followed by the deposition of lithium iron phosphate onto the graphene-C composite. The graphene-C composite is prepared through a sequential process involving graphite oxide smelting, dispersion, and carbonization, followed by the deposition of lithium iron phosphate onto the carbon surface. This approach enables the creation of a uniform, graphene-C composite with controlled graphene dispersion and reduced agglomeration, resulting in improved performance of lithium iron phosphate cathode materials in lithium-ion batteries.

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Lithium iron phosphate-graphene in-situ composite material for high-performance lithium-ion batteries, enabling enhanced electrochemical performance through synergistic enhancement of conductivity and capacity. The composite material comprises lithium iron phosphate cathode material coated with graphene, with specific improvements in conductivity and capacity. The graphene enhances the material's electrical conductivity, while the lithium iron phosphate maintains its electrochemical stability. The composite material demonstrates superior performance compared to conventional lithium iron phosphate cathodes, with enhanced capacity retention and rate capability.

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A multilayer graphene/lithium iron phosphate intercalation composite material for lithium-ion batteries, achieved through a novel supercritical dimethylformamide-based graphene synthesis process. The composite material comprises a multilayer graphene electrode with a high capacity density of 131.5 mAh/g at an initial state charge of 3.5 mAh/g, and maintains 75.5% capacity retention upon repeated charge cycles. The process involves precise control of graphene synthesis conditions, including precise control of the graphite-to-graphene ratio and supercritical dimethylformamide concentration. This approach enables the creation of high-performance lithium iron phosphate intercalation electrodes with superior rate capability compared to conventional synthesis methods.

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Lithium iron phosphate battery with enhanced low-temperature performance and higher energy density. The battery features a specially designed separator that improves lithium ion diffusion at low temperatures, while maintaining the battery's structural integrity. The separator is integrated into the battery cell design, with the positive plate, separator, and negative plate forming a single unit. This configuration enables the battery to maintain its performance characteristics even at extremely low temperatures, making it suitable for electric vehicles operating in cold climates.

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Lithium iron phosphate lithium-ion battery with improved performance characteristics. The battery comprises a positive electrode comprising a positive electrode current collector and a positive electrode material, and a negative electrode comprising a negative electrode current collector and a negative electrode material. The positive electrode material includes 93-95 parts of lithium iron phosphate, 3-5 parts of a positive electrode conductive agent, 2-3 parts of a positive electrode binder, and 5-25 parts of a solvent.

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A lithium battery cathode material preparation method that enables high-performance lithium-ion batteries with improved energy density and stability. The method involves dissolving metal salts in a solvent to obtain metal cations, which are then combined with a specific organogelator to form a gel-like precursor. The gel precursor is then processed through a series of steps, including conversion to a carbon-rich structure, dispersion of graphene, and assembly of the cathode material. The organogelator enables controlled incorporation of graphene while maintaining structural integrity, resulting in a cathode material with enhanced conductivity and stability.

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Composite lithium battery cathode material for high-capacity lithium-ion batteries, comprising a lithium iron phosphate cathode material prepared through a novel synthesis route. The material combines a high-capacity lithium iron phosphate cathode with a conductive organic framework derived from a gelling agent, which is specifically designed to prevent carbon oxidation during the calcination process. This framework structure enables stable cathode performance while maintaining high lithium ion intercalation capacity.

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A method for preparing lithium iron phosphate (LiFePO4) cathode materials with enhanced electrochemical performance through the integration of graphene. The method involves creating a three-dimensional graphene oxide (GDOX) surface that provides optimal contact with the lithium ion electrolyte, while the graphene network facilitates efficient electron transport. The resulting LiFePO4/GDOX composite material exhibits improved lithium ion diffusion and conductivity compared to conventional methods, enabling enhanced performance in lithium-ion batteries.

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A method for preparing lithium iron phosphate (LiFePO4) / graphene composite cathode materials for lithium-ion batteries. The method involves creating a LiFePO4/Graphene composite through a combination of mechanical activation and chemical vapor deposition (CVD) processes. The composite is prepared by first activating the LiFePO4 precursor through mechanical activation, followed by CVD deposition of graphene onto the activated LiFePO4 surface. This composite structure combines the enhanced electrochemical properties of LiFePO4 with the high surface area and conductivity of graphene, enabling improved performance in lithium-ion batteries.

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Graphene composite lithium iron phosphate cathode material for lithium-ion batteries, comprising lithium iron phosphate and dilute graphite. The material combines the high safety and cycle life of lithium iron phosphate with the enhanced conductivity of graphene. The composite is prepared through a process that incorporates sulfonated graphene into the lithium iron phosphate precursor slurry, followed by particle size reduction and calcination. The resulting material exhibits improved conductivity and consistency compared to conventional lithium iron phosphate cathodes.

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A novel method for synthesizing carbon nanotube (CNT)-coated lithium iron phosphate (LiFePO4) composites through an in situ synthesis approach. The process involves the direct incorporation of CNTs into the LiFePO4 material during its synthesis, eliminating the need for separate carbon and LiFePO4 precursors. This approach enables the creation of high-performance LiFePO4 composites with enhanced electrochemical properties, including improved cycle stability and capacity retention. The synthesis method achieves this through the controlled incorporation of CNTs into the LiFePO4 matrix during the synthesis process, resulting in a uniform distribution of CNTs and LiFePO4 phases.

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Lithium iron phosphate (LiFePO4) / graphene composite cathode material for lithium-ion batteries that achieves enhanced performance through a novel graphene-based coating approach. The coating utilizes activated graphene as a carbon source and enriched graphene surface, creating a three-dimensional conductive network between LiFePO4 particles. This graphene-based coating system enables uniform and dense electron transport across the particle surface, significantly reducing diffusion distances and improving charge transfer rates. The resulting material exhibits superior discharge capacity, cycle stability, and overall performance compared to conventional graphene-based coatings.

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A method for preparing lithium iron phosphate battery anode materials through the incorporation of mesoporous carbon (m-CNT) into natural graphite. The method involves modifying natural graphite with m-CNT to enhance its structural and surface properties, particularly in terms of dispersion, surface charge density, and mechanical stability. The m-CNT incorporation improves the anode's ability to maintain its structure during charge and discharge cycles, particularly at low temperatures where lithium iron phosphate battery performance is compromised. This modification enables the creation of lithium iron phosphate battery anode materials with improved charge/discharge characteristics, enhanced surface utilization, and increased capacity retention.

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Graphene-doped lithium iron phosphate composite material with enhanced conductivity and charge-discharge performance. The composite comprises lithium iron phosphate particles with a surface coating of graphene, achieving improved conductivity, charge capacity, and cycle stability compared to conventional lithium iron phosphate materials. The graphene layer is prepared through a controlled oxidation process to produce high-quality graphene oxide, which is then reduced to produce the final graphene coating. The resulting composite material exhibits superior performance characteristics for lithium iron phosphate cathodes in lithium-ion batteries.

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Lithium-ion battery cathode material with enhanced conductivity, charge-discharge performance, and cycle stability. The material comprises lithium iron phosphate particles with a graphene coating on their surface, achieving high electrical conductivity, high charge and discharge capacity, and improved cycle life. The material preparation involves a two-step process: first, a lithium iron phosphate precursor is synthesized and dispersed in ethanol, followed by a graphene coating process. The resulting material has a uniform graphene coating on the iron phosphate surface, ensuring consistent performance across the battery.

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Preparation of LiFePO4/graphene composites for lithium-ion batteries through a novel wet-chemical synthesis route. The process involves a multi-step dispersion of LiFePO4 nanoparticles in a pyrrolidone-based solvent, followed by mechanical milling and subsequent heat treatment in a controlled atmosphere. The resulting composite material exhibits enhanced conductivity and cycling performance compared to conventional methods, with improved thermal stability and mechanical durability.

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A lithium iron phosphate battery with enhanced performance at low temperatures, achieved through a graphene-coated nano-sized lithium iron phosphate cathode and a modified negative electrode. The battery features a conductive graphene coating on the lithium iron phosphate cathode, which improves electron transfer rates and enhances charge capacity at low temperatures. The negative electrode comprises a modified material with improved electrochemical properties, while the electrolyte maintains its performance characteristics. The battery achieves improved low-temperature performance and cycle life through these optimized components.

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Graphene-coated lithium iron phosphate cathode material and preparation method for improved battery performance. The coating involves a two-step process: first, a nitrogen-doped graphene oxide dispersion is prepared through a controlled reaction between graphene oxide and nitrogen sources. This dispersion is then applied to lithium iron phosphate precursor materials, where the graphene oxide enhances electronic conductivity and improves mechanical stability. The resulting coated cathode material exhibits enhanced electrical conductivity, mechanical strength, and thermal stability compared to conventional lithium iron phosphate cathodes.

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A method for preparing graphene/lithium iron phosphate composite materials through controlled graphene dispersion in lithium iron phosphate precursors. The process involves ultrasonic dispersion of graphite oxide in a solvent, followed by wet ball milling and dry grinding to produce a uniform graphene dispersion. The graphene dispersion is then incorporated into lithium iron phosphate precursors or pre-fired materials through wet ball milling and dry grinding, followed by controlled reduction and firing to produce a composite material with uniformly dispersed graphene.

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Graphene-enhanced lithium iron phosphate cathode for lithium-ion batteries with improved rate performance and stability. The cathode comprises a graphene-coated lithium iron phosphate slurry on a carbon nanofiber composite adhesive, with a specific ratio of adhesive to active material. This composite slurry enables enhanced electrical conductivity while maintaining structural integrity through the graphene layer, resulting in improved power density and cycle life.

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Preparation method of low-temperature type lithium iron phosphate batteries that enables continuous discharge at -20°C. The method involves using a ternary solvent system with specific composition and concentration of lithium hexafluorophosphate, LiPF6, and ethylene carbonate (EC) in ethyl methyl carbonate (EMC) at a 3:4:2 ratio. This composition enables enhanced lithium ion conductivity at low temperatures, significantly improving the discharge performance of lithium iron phosphate batteries in cold environments.

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Lithium iron phosphate cathode material for lithium-ion batteries that combines enhanced electronic conductivity with improved lithium ion diffusion rate. The material comprises a lithium iron phosphate precursor powder coated with a 6-10wt% graphene doping layer, where the doping element is either nitrogen, boron, or phosphorus. The graphene layer enhances both electronic conductivity and lithium ion diffusion, leading to significantly improved charge and discharge capacity compared to conventional lithium iron phosphate cathodes. The doping layer also improves cycle life under high discharge rates. The resulting composite material achieves high power density and long cycle life while maintaining excellent cycle stability.

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Lithium secondary battery with improved power characteristics in low voltage operation. The battery features a positive electrode comprising lithium iron phosphate (LiFePO4) and layered lithium nickel manganese cobalt oxide (LNNMCBO), and a negative electrode comprising a negative electrode active material with a potential difference of 3.10 V or higher from the LiFePO4 at a point of 50% state of charge. The negative electrode is made from a material with a higher potential difference than LiFePO4, enabling higher operating voltages and improved power delivery in low voltage regions. The battery achieves enhanced performance in both high voltage and low voltage operation through optimized electrode design and separator architecture.

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A method for preparing lithium iron phosphate (LiFePO4) cathode materials that addresses the conventional limitations of low bulk density and conductivity. The method employs a novel approach to prepare LiFePO4/carbon composites through a granulation process, enabling both improved conductivity and increased density. The composite material combines the benefits of LiFePO4 with the conductivity-enhancing properties of graphene, resulting in a cathode material with enhanced performance characteristics for lithium-ion batteries.

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A nonaqueous electrolyte battery that achieves improved cycle performance by leveraging a novel combination of lithium iron phosphate and lithium titanate electrodes. The battery employs lithium iron phosphate as the positive electrode active material, which provides a stable 3.4 V voltage profile, while lithium titanate serves as the negative electrode active material. The battery utilizes a chain ether as the nonaqueous electrolyte solvent, which enables efficient charge/discharge processes while maintaining optimal electrolyte properties.

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A method for preparing high-performance lithium iron phosphate cathode materials and battery electrodes through a novel composite approach. The process involves synthesizing lithium iron phosphate cathode materials through conventional methods, followed by surface modification with a conductive agent and binder. The modified cathode material is then coated onto a substrate using a uniform layering process, followed by drying and compacting. This composite material enables rapid charge-discharge performance while maintaining high capacity and thermal stability.

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Lithium secondary battery with enhanced power density in low voltage operation. The battery incorporates lithium iron phosphate (LiFePO4) as the positive electrode active material and layered lithium iron oxide (Li2IO3) as the negative electrode active material. At the 50% state-of-charge point, the negative electrode and LiFePO4 exhibit a potential difference of 3.10V, enabling power enhancement in the low voltage region. The LiFePO4 maintains its high energy density even at lower charge levels, while the Li2IO3 provides a stable voltage platform. The optimized design ensures efficient power delivery across the voltage range.

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A method for preparing lithium iron phosphate (LiFePO4) electrodes for lithium-ion batteries by encapsulating the active material within a mesoporous carbon matrix. The encapsulation process involves creating a carbon matrix with high surface area through controlled carbonization and activation, followed by the growth of LiFePO4 crystals on the carbon surface. This structure combines the benefits of LiFePO4's high lithium ion capacity with the improved electrical conductivity and charge/discharge stability of the carbon matrix. The encapsulated LiFePO4 structure enables enhanced cycling performance and reduced material waste compared to traditional methods.

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High-density lithium iron phosphate anode material preparation method for lithium-ion batteries that improves tap density and processing efficiency. The method involves synthesizing lithium iron phosphate particles with a surface modification process that incorporates alkene double modification, followed by carbon coating. This surface modification enhances the anode's electrical conductivity and thermal stability while maintaining its structural integrity. The resulting material exhibits improved tap density compared to conventional methods, enabling higher lithium-ion battery densities.

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Power cell for electric vehicles that enhances cycle life and performance through optimized electrode materials. The cell employs a novel electrode configuration featuring carbon-coated copper foil anodes and a ceramic membrane diaphragm. The anode paste contains nanometer-grade lithium iron phosphate, conductive carbon black, and modified artificial graphite, while the cathode paste incorporates nanometer-grade lithium iron phosphate, conductive carbon black, and modified artificial graphite. The cell's membrane features a single-layer ceramic coating with a thickness of 20 microns. The battery cell design combines advanced electrode materials with a unique membrane structure to improve charging and discharging performance while maintaining high cycle life.

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High-performance lithium iron phosphate battery for energy storage applications that addresses both high and low temperature performance challenges. The battery improves upon existing lithium iron phosphate batteries by enhancing both high and low temperature discharge characteristics. This enables greater energy density and longer cycle life in both warm and cold operating conditions, making it suitable for applications requiring high performance across a broad temperature range.

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A novel method for preparing lithium iron phosphate (LiFePO4) anodes through optimized interface formation between graphite and alkene precursors. The process involves sequential addition of lithium hydroxide, iron source, and phosphorus source precursors to the graphite matrix, followed by controlled heating to promote interface formation. This approach enables the creation of LiFePO4 anodes with enhanced electrochemical performance through optimized interface structure.

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