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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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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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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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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Enhancing lithium nickel manganese cobalt oxide (LNMCO) battery performance through a novel approach to improving thermal stability. The invention involves creating stable, homogeneous mixtures of LNMCO active materials, where each component retains its chemical integrity during normal operating conditions. These discrete regions or particles combine to form a single, homogeneous material, enabling the use of commercially available LNMCO in LIBs while maintaining their inherent thermal stability.

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