Yttrium ion modified lithium ion battery ternary positive electrode material and preparation method thereof

Abstract

The invention discloses an yttrium ion modified lithium ion battery ternary positive electrode material and a preparation method thereof. The chemical formula of the lithium ion battery ternary positive electrode material is Li (Ni<0.6>Co<0.2>Mn<0.2>)<1-x>Y<x>O<2>, and x is greater than or equal to 0.005 and less than or equal to 0.015. The preparation method comprises the following steps: addingnickel oxide, cobalt oxide, manganese dioxide, lithium carbonate and yttrium oxide into deionized water, uniformly stirring, carrying out medium ball milling, and carrying out spray drying on the obtained slurry to obtain lithium ion battery ternary positive electrode material precursor powder; and briquetting and calcining the obtained powder. According to the yttrium ion modified lithium ion battery ternary positive electrode material, the radius of the yttrium ions is far greater than that of the ions of a transition metal layer, so that the interlayer spacing is enlarged after replacement,the diffusion speed of the lithium ions is increased, meanwhile, the lithium-nickel mixed arrangement is reduced, and the electrochemical performance of the material is improved.

Description

technical field [0001] The invention belongs to the field of lithium-ion battery manufacture, and specifically relates to a lithium-ion battery ternary cathode material modified by yttrium ions and a preparation method thereof. Background technique [0002] Clean and efficient lithium-ion secondary batteries can improve sustainable and efficient energy for the development of society, reduce excessive dependence on traditional energy sources such as oil, and reduce the pressure on the ecological environment. Lithium-ion batteries have outstanding advantages such as long cycle life, light weight, small size, wide voltage range, large specific capacity, no memory effect, and fast charging and discharging. After decades of technological development, a batch of lithium-ion batteries with a wide range of market applications and low prices have been developed. As my country strongly recommends the transformation of fuel vehicles to electric vehicles, lithium-ion batteries once aga...

AI Technical Summary

Problems solved by technology

[0004] With the increase of nickel content, the content of manganese, which plays a role in stabilizing the structure, and the content of cobalt, which can improve electronic conductivity, in the material are all reduced, which makes the mixing of lithium and nickel in the material more serious, and the rate performance and cycle stability become worse.

At the same time, high-nickel materials have higher requirements on the humidity of the air, and are easy to react with water and carbon dioxide, causing the battery to bulge.

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