Core-Shell Lithium Metal Oxide Cathode for High Voltage Stability

The patent uses a composite material structure consisting of a core shell composite particle where Li2MnO3 forms the core and LiCoO2 forms the shell. This composite structure allows the material to achieve high electrical capacity through the LiCoO2 shell while the Li2MnO3 core provides structural stability, preventing capacity degradation during charge-discharge cycles. The composite approach combines the advantages of both materials to resolve the contradiction between high capacity and structural stability.

The patent applies local quality by creating a core shell structure where different regions of the particle have different compositions and functions. The core region (Li2MnO3) provides structural stability while the shell region (LiCoO2) provides high capacity. This spatial differentiation of material properties allows the overall particle to simultaneously achieve both structural stability and high electrical capacity, resolving the technical contradiction.

The patent employs a composite material approach where Li2MnO3 (core) and LiCoO2 (shell) are combined in specific ratios. This composite structure enables the material to achieve high specific capacity (250-280 mAh/g) while maintaining good cycle life characteristics. The synergistic effect of the two materials in the composite structure prevents the rapid voltage decay and capacity fading that occur when excessive lithium is used in single-phase materials.

The patent optimizes the composition parameters by controlling the molar ratio of Li2MnO3 to LiCoO2 in the core shell structure, and by doping with metals such as Ni, Co, Mn, Fe, Cr, Ti, Cu, Al, Mg, Zr, or B. This parameter optimization allows the material to achieve high specific capacity while maintaining structural stability and good cycle life, resolving the contradiction between capacity and duration.

The patent uses a composite material structure where Li2MnO3 forms the core and LiCoO2 forms the shell. This composite approach allows the material to achieve high electrical capacity while maintaining structural stability at high voltages. The LiCoO2 shell provides a stable protective layer that prevents structural degradation, while the Li2MnO3 core contributes to high capacity, resolving the contradiction between capacity and compositional stability.

The patent applies local quality by creating a core shell structure where the shell region (LiCoO2) provides structural stability at high voltages while the core region (Li2MnO3) provides high capacity. This spatial differentiation allows different parts of the particle to fulfill different functions, with the shell protecting the core from structural degradation during high-voltage operation.