Multi-component and single-core-shell structured positive electrode material of lithium ion battery and preparation method

Abstract

The invention provides a multi-component and single-core-shell structured positive electrode material of a lithium ion battery. The positive electrode material comprises a shell and a core arranged in the shell, wherein the core comprises at least two kinds of components; the material of each component is selected from one kind of a positive electrode active material with a laminated structure, a positive electrode active material with a spinel structure, and a positive electrode active material with an olivine structure; the material of the shell is selected from at least two kinds of the materials selected from the positive electrode active material with the laminated structure, the positive electrode active material with the spinel structure, and the positive electrode active material with the olivine structure; the positive electrode active material with the laminated structure comprises <x>Li<2>MO<3>.(1-x)LiMO<2>, wherein x is greater than or equal to 0 and less than 1; the positive electrode active material with the spinel structure comprises LiM<2>O<4>; and the positive electrode active material with the olivine structure comprises LiMPO<4>, wherein M is selected from one or more of metal elements with the atomic number of greater than six. The invention also provides a preparation method for the positive electrode material of the lithium ion battery.

Description

technical field [0001] The invention relates to a lithium-ion battery cathode material with a multi-component single core-shell structure and a preparation method thereof. Background technique [0002] Lithium-ion batteries are considered to be the most promising due to their high voltage, high capacity and environmental characteristics, and are therefore widely used in a wide range of fields from notebook computers to electric vehicles. But existing lithium-ion battery technology is not yet able to meet the growing demand for high-performance energy. The energy density, capacity, charge and discharge performance, cycle life, safety performance and cost of lithium batteries are mainly determined by the components (including chemical components and structural components) that make up the battery. The composition of the positive electrode material includes layered materials such as nickel-cobalt lithium manganese oxide, lithium nickel-cobalt aluminate, lithium cobalt oxide, e...

AI Technical Summary

Problems solved by technology

However, this method is only a macroscopic mixture of various substances, which may cause the inhomogeneity of various performance indicators and fail to achieve the desired effect.

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