Thermal Stability Improvement in Nickel Manganese Cobalt EV Batteries

Lithium-ion battery for electric vehicles with enhanced thermal stability and safety. The battery comprises a positive electrode sheet and a negative electrode sheet, with the positive electrode sheet featuring a current collector and an active layer comprising lithium nickel cobalt manganese oxide (NCM) and manganese iron lithium oxide (MIL). The MIL active material is optimized with a specific composition and thickness to enhance thermal resistance and prevent thermal runaway. The negative electrode sheet incorporates conductive carbon black, dispersant, and binder. The battery assembly satisfies specific dimensional requirements for current collector and active layer dimensions.

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Battery with improved performance under high-rate charge/discharge conditions through optimized electrode architecture. The battery features a positive electrode sheet with precisely engineered recesses and protrusions that correspond to the sheet's surface features. The recesses have controlled dimensions ranging from 0.2mm to 8mm in width, while the protrusions have corresponding dimensions. The design ensures uniform lithium ion migration between the electrode surfaces, enhancing energy density, cycle life, and lithium precipitation prevention. The recesses and protrusions are strategically positioned to minimize the lithium ion migration time difference between the electrode surfaces, while maintaining optimal structural integrity.

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Battery with enhanced temperature regulation through a novel electrode configuration. The battery features an electrode body with an inner current collection region and an outer current collection region. The inner region has a wider width than the outer region, with the inner collection region extending from the body's inner surface to the outer surface. This design enables the electrode terminal to be positioned between the two collection regions, with the wider inner collection region acting as a thermal buffer between the terminal and the body's surface.

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Thermal stability of high-nickel ternary positive electrode and silicon-doped negative electrode batteries in lithium-ion batteries is improved by using chain carbonate and/or fluorinated cyclic carbonate as the electrolyte solvent instead of conventional ethylene carbonate and propylene carbonate. The chain carbonate includes dimethyl carbonate, ethyl methyl carbonate, diethyl carbonate, methyl n-propyl carbonate, ethyl n-propyl carbonate, di-n-propyl carbonate, Propyl ester, bis(fluoromethyl) carbonate, bis(difluoromethyl) carbonate, bis(trifluoromethyl) carbonate, bis(2-fluoroethyl) carbonate or bis(2,2-di At least one of fluoroethyl) carbonates.

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Cathode material for lithium-ion batteries with improved high temperature stability and cycle life compared to conventional high energy density cathode materials. The cathode has lithium nickel compound particles with a porous structure and distributed erythium oxide particles within the pores. The porous structure reduces agglomeration, improves dispersion, and surface area. The erythium oxide particles enhance cycle stability and thermal stability due to their chemical resistance and buffering effect on stress. Adding metal oxides like aluminum trioxide and zinc oxide in the shell further improves cycle stability and energy density.

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Electrochemical device with improved cycle life through controlled negative electrode expansion. The device comprises a positive electrode, a negative electrode, and a separation film between them. The positive electrode surface features a recessed area, and the separation film creates a gap between the positive and negative electrodes. The recessed area on the positive electrode and the gap between the electrodes serve as a buffer zone, absorbing expansion forces during the battery cycle. This design enables the negative electrode to expand naturally during discharge, while preventing excessive deformation that can compromise the battery's mechanical integrity.

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Lithium-ion battery with enhanced thermal stability through optimized cathode composition. The battery features a cathode comprising lithium nickel cobalt manganese oxide (LNCM) and manganese iron lithium oxide (MIL), with precise control over the LNCM to MIL ratio and compaction density. The cathode is prepared by mixing these components with a binding agent and conductive agent, then coated onto a current collector. The battery's thermal stability is improved through the incorporation of a specific manganese-iron-lithium oxide composition and processing conditions, which enhances the cathode's thermal resistance and prevents thermal runaway.

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Secondary battery with improved thermal safety and energy density by optimizing the composition of the positive electrode, electrolyte, and explosion valve. The positive electrode active material is a mix of nickel-cobalt-manganese oxide with specific ratios of monocrystalline and polycrystalline forms. The electrolyte contains a solvent with specific ratios of carbonate and carboxylate esters. The explosion valve has an upper pressure threshold. This composition balances for high energy density, good cycling, and thermal safety.

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Positive pole piece for lithium-ion batteries that enhances energy density, low-temperature power, and safety performance. The piece comprises a positive current collector and a positive electrode diaphragm with a specific active material composition. The diaphragm is coated with a positive electrode membrane formed through a controlled drying and cold pressing process. The membrane provides improved thermal stability and low-temperature performance characteristics, while maintaining safety properties. The composition of the active materials in the membrane ensures optimal balance between energy density, low-temperature performance, and safety.

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Battery design that improves both energy density and thermal stability while maintaining high cycle life. The battery combines a high-nickel layered oxide cathode with a nickel-cobalt-manganese ternary material, which optimizes performance characteristics for both low-temperature operation and high-temperature cycling. The nickel-cobalt-manganese composition is carefully optimized to balance kinetic performance, thermal stability, and internal resistance characteristics, enabling the battery to achieve superior performance across a wide operating range.

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Battery with enhanced thermal management during charging. The battery comprises a single electrode body with an inner current collection region and an outer current collection region, where the inner region houses the electrode tab and its associated components. The electrode terminal extends from the inner region through the exterior body to the outer region, featuring a wider inner current collection region compared to the outer one. This design configuration enables the electrode terminal to dissipate heat generated during charging, particularly when the battery is rapidly charged, by providing a larger thermal path for heat dissipation.

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Lithium-ion battery with improved low-temperature performance through enhanced negative electrode interface stability. The battery comprises a nickel cobalt lithium manganate polycrystalline positive electrode and a nickel cobalt lithium manganate single crystal negative electrode, with a polyacrylic acid binder in the negative electrode. The binder enables stable interface formation between the negative electrode materials, while the battery's winding structure generates localized temperature gradients that enhance discharge characteristics at low temperatures.

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Non-aqueous electrolyte secondary battery with high capacity retention and low gas generation at high temperatures. The battery comprises a positive electrode with a lithium-containing transition metal oxide active material that can insert and extract metal ions, and a non-aqueous electrolyte containing lithium salts such as lithium tetrafluoroarsenite. The electrolyte is maintained at a low temperature (around 25°C) during charging and discharging, which prevents metal ion migration and gas evolution. The positive electrode maintains its structural integrity even at elevated temperatures, while the electrolyte maintains its integrity through its low-temperature operation.

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Lithium-ion battery positive electrode active material with improved electrochemical performance and reduced cost. The material comprises a specific molecular structure with a precise particle size distribution, enabling enhanced lithium ion mobility and stability. The material's narrow particle size distribution range of 4-8 microns is achieved through precise control of dopant incorporation and crystal growth conditions. This results in improved cycle performance, rate capability, and energy density compared to conventional materials. The material is specifically designed for lithium-ion batteries, particularly for high-performance applications where compact density and high-temperature stability are critical.

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A high-performance lithium transition metal oxide for lithium-ion batteries that combines enhanced capacity with improved thermal stability. The material contains a high concentration of nickel (80% or higher) and cobalt (Co) in a lithium transition metal oxide structure, with the nickel-cobalt ratio maintained within 1.1% of the maximum. The material undergoes controlled thermal treatment to optimize its structural and chemical properties, resulting in superior thermal stability and reduced lithium by-product generation compared to conventional lithium transition metal oxides.

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Nonaqueous electrolyte secondary battery with enhanced aging capacity efficiency through optimized electrode design. The battery comprises a negative electrode with amorphous carbon-coated graphite and a positive electrode featuring a lithium manganese oxide (LMO) and lithium nickel oxide (LNO) mixture with a 20:80 to 90:10 LMO:LNO ratio. The design combines high charge-discharge efficiency with improved capacity retention through carefully controlled electrode thickness and active material layer thickness, while maintaining optimal electrolyte properties.

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Positive electrode active material for lithium-ion batteries with enhanced discharge characteristics. The material, comprising a solid solution of Li[NiCoMn]O2, achieves higher discharge capacities compared to conventional materials through improved charge-discharge cycle performance. The solution enables precise control over the distribution of transition metal ions within the solid solution, resulting in a uniform distribution of charge carriers across the electrode surface. This uniformity is achieved through a novel co-precipitation method that simultaneously precipitates Ni, Co, and Mn precursors, allowing precise control over the Mn distribution. The resulting material exhibits superior discharge characteristics, including enhanced rate capability and charge retention, while maintaining high cycle life.

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Lithium-ion battery with enhanced safety and performance characteristics. The battery features a current collector with a positive electrode active material layer, where the active material is a composite of lithium cobalt oxide, nickel, manganese, cobalt, and other elements. The active material layer is formed on the current collector through a process that maintains high density while ensuring uniform particle distribution. The battery also incorporates a separator and electrolyte system, with a specific design that addresses issues of current collector wear and structural integrity. The battery's design enables high capacity and input/output performance while maintaining safety through optimized electrode architecture and separator properties.

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A positive electrode material for lithium-ion batteries that improves thermal stability and cycle life compared to traditional cathode materials like lithium-nickel-cobalt oxide (LNCO). The new material is a mixture of LNCO and lithium-nickel-manganese-cobalt oxide (LNMCO). The LNMCO provides stability by reducing oxygen release during charging compared to LNCO. The mixture improves thermal stability, specific capacity, and cycle life compared to pure LNCO or LNMCO.

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Cathode material for lithium-ion batteries that achieves long-term safety and performance through a novel combination of manganese spinel oxide and lithium/manganese composite oxide. The material, comprising a mixture of the manganese spinel oxide and lithium/manganese composite oxide, provides enhanced safety and stability at both room temperature and high temperature through the substitution of manganese sites. This material enables high-power lithium-ion batteries with improved cycle life and performance characteristics compared to conventional lithium/manganese oxide cathodes.

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