Reduce Voltage Fading in Lithium Manganese Rich EV Batteries

Lithium-ion battery cathode material with improved cycle life for electric vehicle applications. The cathode material contains lithium, manganese, nickel, cobalt, or aluminum substitutes like zirconium, and oxygen. The cathode particles have an outer layer of aluminum, zirconium, or a combination. This aluminum coating prevents direct contact with the electrolyte and improves stability compared to typical manganese-based oxides. The aluminum coating is applied through an atomic layer deposition step in the cathode production process.

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Lithium-yttrium-based oxide positive electrode active material for lithium-ion batteries (LIBs) that enhances cycle life through surface modification. The material, comprising Li, M', and oxygen, exhibits improved electrochemical performance compared to conventional cathode materials. The material undergoes a series of calcination and treatment steps to create a surface-modified oxide that exhibits reduced capacity fade and improved stability. The material's surface properties are characterized using XPS analysis, demonstrating enhanced surface area and surface reactivity.

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Activating lithium-rich manganese-based cathode materials for lithium-ion batteries through controlled charging conditions to optimize capacity and voltage stability. The method involves selectively charging the material at specific voltage thresholds, selecting appropriate charging modes, and controlling the charging current density to balance capacity enhancement and voltage plateau stabilization. This approach enables the development of cathode materials with higher energy density and improved stability compared to conventional manganese-based cathodes.

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Lithium-rich manganese-based composite material for lithium-ion batteries, comprising a primary phase of LiNi0.8Co0.1Mg0.2O2 with a secondary phase of Li2O · ZLiMnO2 doped within the primary phase, where the secondary phase content is 0.2112 mol% Li2O · ZLiMnO2.

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A method for monitoring the safety of lithium-ion batteries during storage to prevent thermal runaway. The method measures the capacity recovery rates of the battery after initial charging and discharging cycles, with specific thresholds for Mn dissolution and lithium precipitation. By comparing these recovery rates against a reference capacity loss rate, the method determines if the battery is at risk of thermal runaway when stored at elevated temperatures.

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A lithium-ion battery positive electrode with enhanced safety and capacity through a novel solid solution of lithium-rich manganese compounds. The solid solution, comprising lithium-rich manganese-based compounds, provides improved thermal stability and resistance to extreme conditions like overcharging and high temperatures, while maintaining the balance of lithium ions. This solid solution-based positive electrode enables the battery to operate safely under conditions that would otherwise compromise its performance.

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Enhancing lithium-ion battery performance through the development of negative electrode materials with improved cycle stability. The invention addresses the issue of lithium-ion battery degradation by introducing a novel negative electrode material with enhanced capacity retention. The material achieves this through a unique combination of high capacity density and controlled volume expansion, which prevents the formation of excessive SEI layers during charge/discharge cycles. This approach enables the battery to maintain its capacity over repeated charge/discharge cycles while maintaining high energy density.

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Lithium-ion battery with enhanced cycle life through optimized electrolyte chemistry. The battery features a positive electrode with lithium manganese nickel composite oxide as the active material, where the electrolyte contains dimethyl carbonate as a non-aqueous solvent. This combination provides superior oxidation resistance and decomposition resistance, particularly when high-potential lithium manganese nickel oxide is used. The battery achieves improved charge-discharge characteristics by setting the end-of-charge voltage at 3.7V or less, which prevents potential issues with electrode degradation during charging.

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Nonaqueous electrolyte secondary battery with enhanced low-temperature performance. The battery comprises a sealed accommodation container housing polarizable electrodes, a separator, and an electrolyte solution containing a lithium salt, organic solvent, and supporting salt. The solution is optimized for low-temperature operation with a specific ratio of PC to EC to DME and lithium salt concentration. The negative electrode features a SiOx active material with carbonized surface, while the positive electrode incorporates lithium-manganese oxide. The optimized electrolyte maintains high conductivity even at temperatures below -20°C, enabling reliable operation in low-temperature environments.

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A composite cathode active material for lithium-ion batteries that enhances performance at lower voltages while maintaining high capacity. The material comprises a core containing a first lithium transition metal oxide with a specific layered crystalline structure and a coating layer on the core surface. The coating layer contains a second lithium transition metal oxide with varying composition, including a manganese-rich phase or lithium-rich phases. The composite material is prepared through a heat treatment process that selectively preserves the residual lithium from the core surface, while the second transition metal oxide layer is formed on the core surface. This approach enables the material to maintain its high capacity characteristics at lower voltages while preventing degradation from excessive lithium exposure.

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Lithium-ion battery cathode with enhanced performance and cost-effectiveness. The cathode comprises a lithium-rich manganese-based positive electrode sheet prepared through a novel method that incorporates a wide range of metal dopants like Al, Zr, Ti, and Mg. The sheet is prepared by coating a current collector with a slurry containing the dopants, followed by drying and subsequent processing to form a uniform sheet. The resulting cathode exhibits superior performance characteristics, including enhanced specific discharge capacity and improved cycle life, while maintaining the same preparation method.

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Diamond-free lithium-rich manganese-based cathode material for lithium-ion batteries, comprising a novel manganese-based cathode material with improved stability and cycleability compared to conventional materials. The material is prepared through a novel process that replaces diamond with alternative carbon materials, resulting in enhanced performance characteristics such as improved charge/discharge cycles and specific capacity. The material is incorporated into a lithium-ion battery design featuring a composite positive electrode piece, organic electrolyte, separator, and packaging film.

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Lithium-ion battery with enhanced safety, cycle life, and storage performance through optimized electrode design. The battery incorporates a lithium manganese-based positive electrode active material in its core, while the electrolyte solution contains a specific additive comprising vinylene carbonate. This additive enhances the lithium-ion intercalation process by stabilizing the lithium-ion insertion position at high temperatures, thereby maintaining capacity and preventing degradation. The battery achieves superior performance characteristics compared to conventional lithium-ion batteries, particularly at elevated temperatures.

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NCA ternary battery with high nickel-rich lithium manganese-based solid solution cathode material that addresses the performance limitations of current NCA cathodes. The battery combines the advantages of high-temperature stable, cost-effective NCA cathodes with enhanced cycle life and rate capability. The cathode material comprises a high-yield lithium-rich manganese-based solid solution, where the manganese content accounts for at least 10% of the total weight, and incorporates Cr, Co, Ni, Ni-Co, Ni-Mn, Ni-Co-Mn, Ni-Co-Al, Fe, and Ru. This composition enables superior performance characteristics, including high capacity, good thermal stability, and safety, while maintaining the cost-effectiveness of NCA cathodes.

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A cathode electrode material for lithium-ion batteries that enhances performance by supplementing the irreversible capacity loss of the first charge and discharge. The material comprises a cathode active material layer with a lithium-rich transition metal oxide material modified with a conductive polymer, where the lithium-rich transition metal oxide has a specific formula of LixMeyOz, 1 * X yum2,1 yum2,3 yum4,Me is one or more of Mn, Ti, Cr and Zr.

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Lithium-ion battery cathode material with enhanced specific energy density and improved safety through a novel manganese-based cathode. The material achieves high capacity while maintaining high rate performance and first coulombic efficiency. The cathode material has a specific surface area of 0.37 m^2/g and a molecular formula of Li2Mn3.5LiNio.5Mn0.5O4.5LiNio.5Mn0.5O2, enabling efficient charge and discharge cycles while minimizing volume expansion. The material's unique composition and processing conditions enable superior battery performance compared to conventional cathodes.

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A conductive agent for lithium-ion battery electrodes that enables high-performance battery cells with improved cycle life. The agent combines single-walled carbon nanotubes and graphene nanosheets in a specific ratio to form a conductive network that fills the electrode pores without compromising active material properties. The agent's unique nanoscale structure allows for efficient conductivity while maintaining electrode stability, particularly during high-temperature cycling. The agent enables battery cells with improved energy density and reduced capacity loss compared to conventional conductive agents.

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Lithium-ion battery with enhanced energy density through a novel cathode material approach. The battery achieves significant capacity gains by replacing traditional cathode materials with lithium-rich manganese-based solid solutions, which exhibit unique crystal structures that facilitate lithium migration during charging. The solid solutions enable higher lithium intercalation capacities and improved Coulomb efficiency compared to conventional materials, while maintaining structural integrity during charging. The battery achieves high energy density (708 Wh/L at 500 cycles) with excellent capacity retention (82.1% at 500 cycles) and volume retention (693 Wh/L at 500 cycles).

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A lithium-ion battery that improves voltage stability by leveraging a novel cathode design featuring a conductive agent and graphene-based composite structure. The cathode comprises a lithium-rich cathode material, a conductive agent, polyvinylidene fluoride (PVDF), and a polyacrylonitrile-based binder. The negative electrode material is made from a composite of a conductive agent, a porous separator, and a binder. This innovative cathode design addresses the voltage stability issues typically associated with lithium-rich cathode materials. The battery's overall performance is enhanced through the optimized cathode structure, which enables improved capacity retention and cycle life.

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A flexible polymer-based cathode material for lithium-ion batteries that combines conductive polymer networks with lithium-rich cathode materials. The material comprises a flexible polymer matrix, where the polymer is formed through ink-jet printing and mechanical dispersion, and a lithium-rich cathode material. The polymer matrix provides enhanced mechanical flexibility and deformation properties, while the lithium-rich cathode material maintains its electrochemical performance. The combination enables stable operation of lithium-ion batteries in flexible devices while maintaining high lithium-ion storage capacity.

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