Cobalt-free lithium-rich positive electrode material, and preparation method and application thereof

Abstract

The invention provides a cobalt-free lithium-rich positive electrode material, and a preparation method and application thereof. The preparation method comprises the steps that a manganese source and Ni-MOF are mixed and subjected to primary calcination to obtain a nickel-manganese matrix, the nickel-manganese matrix and a lithium source are mixed and subjected to secondary calcination to obtain a lithium nickel manganese oxide matrix, the lithium nickel manganese oxide matrix and a zirconium source are mixed and subjected to tertiary calcination to prepare the cobalt-free lithium-rich positive electrode material. According to the invention, Ni-MOF is adopted as the Ni source, three-step calcination is combined, and the Ni source is mixed with the zirconium source in the three-step calcination to form the cobalt-free lithium-rich positive electrode material with a layered structure, so that the cycling stability and the voltage drop of the material are improved, and the cobalt-free lithium-rich positive electrode material has the characteristics of good electrical property, low cost and the like.

Description

technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to a cobalt-free lithium-rich cathode material, a preparation method and an application thereof. Background technique [0002] In recent years, new energy has highlighted the explosive growth trend, and there is an urgent need for a cathode material with low cost, high energy density, high cycle performance and high safety. At present, the cathode material LiCoO on the market 2 Neither NCM nor ternary material (NCM) can meet the above conditions at the same time. The main reason is that the price of cobalt element continues to rise, and cobalt is also a non-environmentally friendly element. Ni in the process of charge and discharge in the ternary material 2+ and Li + The mixed discharge of mixed materials leads to poor cycle stability; in addition, high-nickel materials have problems such as serious gas production and poor low-temperature performance, which further ...

AI Technical Summary

Problems solved by technology

At present, the positive electrode materials LiCoO2 and ternary materials (NCM) on the market cannot meet the above conditions at the same time. The main reason is that the price of cobalt element continues to rise, and cobalt is also a non-environmentally friendly element.

The mixed discharge of Ni2+ and Li+ in the ternary material during charge and discharge causes poor cycle stability; in addition, high-nickel materials have serious gas production and poor low-temperature performance and other issues, further restricting its development

In addition, its cost is low and it is environmentally friendly. However, the current lithium-rich manganese-based cathode materials have poor cycle stability and serious voltage drop problems, which seriously restrict their industrial development.

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