A kind of high-performance cathode material and preparation method thereof

Abstract

The invention discloses a novel high-performance cathode material. The novel cathode material is a composite material formed by coating a ternary material with a transition metal oxide, and belongs to the technical field of ternary material preparation. Using two-dimensional layered MXene as the precursor of transition metal oxides, solid-phase grinding and high-temperature calcination were used to directly prepare ternary materials uniformly coated with transition metal oxides. The invention can prepare a ternary material evenly coated with a transition metal oxide in one step, has strong universality, and a simple preparation process. The ternary material prepared by the method has a uniform appearance and is used as a positive electrode material of a lithium ion battery with stable cycle performance. , excellent rate performance.

Description

technical field [0001] The invention relates to a ternary positive electrode material technology of a lithium-ion battery covered by solid-phase sintering of Mxene powder, which belongs to the technical field of lithium-ion batteries. Background technique [0002] Since lithium-ion batteries were first commercialized by Sony in the 1990s, their proportion in the energy market has increased year by year. Lithium-ion batteries have significant advantages such as high specific energy, high working voltage, long cycle life, small self-discharge, environmental friendliness, and long life, and are widely used in portable electronic devices such as notebook computers, mobile phones, cameras, and so on. Compared with LiCoO2, which can only play 50% of the theoretical specific capacity, and Co metal resources are scarce, and the toxicity of Co will cause harm to people and the environment, the layered ternary material system combines the advantages of various transition metal element...

AI Technical Summary

Problems solved by technology

[0003] At present, the main problem of ternary materials is that the voltage platform continues to decay as the cycle progresses. At the same time, high-nickel ternary materials also have defects such as poor cycle stability and poor high-temperature performance.

In comparison, LiNi1 / 3Co1 / 3Mn1 / 3O2, LiNi0.4Co0.2Mn0.4O2, LiNi0.5Co0.2Mn0.3O2 materials have better cycle performance, but poor rate performance

[0004] At present, the process of transition metal oxide-coated ternary cathode materials is complex, and the transition metals involved come from many toxic and harmful organic solutions, which are relatively difficult to deal with, and subsequent wastes are likely to cause environmental pollution, which greatly increases the process cost.

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