Lithium-rich manganese-based positive electrode material capable of realizing accurate lithium matching, and preparation method and application thereof

Abstract

The invention discloses a lithium-rich manganese-based positive electrode material capable of realizing accurate lithium preparation and a preparation method and application thereof. The preparation method comprises the following steps: S1, weighing corresponding soluble metal salts according to a proportion and mixing the soluble metal salts into a metal salt solution; S2, adding the metal salt solution, the precipitant solution and a complexing agent into a reaction kettle, reacting and filtering to obtain a precursor; S3, putting the precursor into a muffle furnace, and calcining in an air atmosphere; S4, mixing and stirring the precursor and a lithium source to obtain a mixture; S5, sintering the mixture in a muffle furnace. According to the method, the precursor of the lithium-rich manganese-based positive electrode material is oxidized and pre-sintered in the air, so that the hardness of the precursor is increased, the structure is more favorably maintained, the component structure is single, accurate lithium preparation is realized, residual lithium on the surface is reduced, and the stability of the structure is enhanced; compared with a conventional method, the method is efficient, economical and easy to operate, the process is easy to control, and the problem of deviation of the lithium preparation amount in a traditional method can be well solved.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a lithium-rich manganese-based positive electrode material for realizing precise lithium allocation, a preparation method and application thereof. Background technique [0002] With the rapid development of the global economy and science and technology, people's demand for energy is also increasing, and the energy storage crisis of traditional fossil energy (coal, oil, etc.) is gradually emerging, so the development and utilization of new energy has become a research hotspot. People have begun to use clean energy such as wind energy and water energy, but these energy sources are time-sensitive, and batteries need to be used to convert and store these energies before making rational use of them. Nickel-metal hydride batteries and lead-acid batteries were once commonly used secondary batteries, but they were gradually replaced by lithium-ion batteries due to their low...

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Problems solved by technology

[0006] The purpose of the present invention is to provide a lithium-rich manganese-based positive electrode material that realizes accurate lithium distribution and its preparation method and application in view of the large error in the amount of lithium that exists in the current lithium-rich manganese-based positive electrode materials. During the test, it was found that although the lithium-rich manganese-based cathode material does not have obvious cation mixing problems, after the precursor of the lithium-rich manganese-based cathode material is pre-fired in air, the hardness of the precursor becomes larger, and the primary particle transformation It is similar to a single crystal, and makes its highly active crystal face more exposed, and has a single composition structure, so that it can achieve precise lithium allocation, which solves the shortcomings in the existing technology

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