4.7 V-grade lithium cobalt oxide positive electrode material, preparation method thereof and corresponding battery

Abstract

The invention discloses a 4.7 V-grade lithium cobalt oxide positive electrode material, a preparation method thereof and a corresponding battery, and belongs to the technical field of lithium ion batteries. The positive electrode material is of a core-shell structure, and the core is lithium cobalt oxide; the shell layer is rare earth metal doped lithium cobalt oxide, the position of Li < + > is replaced by rare earth metal ions, and the doping depth is 1-200nm on the surface of the lithium cobalt oxide; the rare earth metal ions have 4f orbits. The preparation method comprises the following steps: (1) preparing a rare earth metal source, a cobalt source and a lithium source in proportion to form a mixture; (2) calcining the mixture at 800-1200 DEG C for 4-24 hours to obtain a primary calcined product; (3) crushing the primary calcined product, and performing secondary calcination at 800-1200 DEG C for 4-24 hours to obtain a lithium cobalt oxide crude product; and (4) crushing the lithium cobalt oxide crude product to obtain a finished product. The first reversible capacity of the positive electrode material reaches up to 240.1 mAh / g under the charging cut-off voltage of 4.7 V, and the cycling stability is good.

Description

technical field

[0001] The invention belongs to the technical field of lithium ion batteries, and relates to a 4.7V grade lithium cobalt oxide positive electrode material, a preparation method thereof and a corresponding battery. Background technique

[0002] Lithium-ion batteries are widely used in consumer electronics, electric vehicles, aerospace and other fields due to their high energy density and power density, long cycle life, no memory effect, and environmental friendliness. With the rapid development of the Internet industry and the advent of the 5G era, people's demand for battery life of mobile terminals (such as smartphones, VR glasses, drones, small robots, etc.) is getting higher and higher. As the core power component of mobile terminals, the energy density of lithium-ion batteries has become the core of consumers' demands. The composition of lithium-ion batteries includes positive electrodes, negative electrodes, electrolytes, separators, and battery packagi...

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