Lithium nickel cobalt aluminum oxide and lithium manganese oxide composite material used for lithium ion battery and preparation method thereof

Abstract

The invention discloses a lithium nickel cobalt aluminum oxide and lithium manganese oxide composite material used for a lithium ion battery and a preparation method of the lithium nickel cobalt aluminum oxide and lithium manganese oxide composite material. According to the method, suspension liquid is prepared through mixing lithium nickel cobalt aluminum oxide with water, doped type lithium manganese oxide precursors are prepared by the utilization of a co-precipitation method, so that the prepared precursors are evenly precipitated on the surface of lithium nickel cobalt aluminum oxide, and through calcination, crushing and screening, the composite material which is doped with lithium manganese oxide and coated with the lithium nickel cobalt aluminum oxide is obtained. According to the material, the lithium nickel cobalt aluminum oxide (the structural formula is LiNi0.8Co0.15Al0.05O2) serves as a core, and the doped lithium manganese oxide < the structural formula is LiMn2-xMxO4 (0.1<=x<=0.5), and M is one or two of Mg, Co, Al, Cr, Zn and Ti> serves as a shell. The doped lithium manganese oxide serves as a coating layer, through a combination of a control crystallization method and a liquid-phase ball milling method, the doped type lithium manganese oxide precursors are prepared, the defects that a traditional lithium manganese oxide material is low in energy density, and cycling performance of the lithium nickel cobalt aluminum oxide is poor are overcome, the capacity of the material is high, and the cycling performance is excellent. The preparation method is simple, and industrial production is easy.

Description

technical field [0001] The invention relates to a lithium-ion secondary battery, in particular to a nickel-cobalt-aluminum-lithium and lithium manganate composite material for a lithium-ion battery and a preparation method thereof. Background technique [0002] Lithium-ion secondary batteries are widely used in portable electronic products, electric vehicles, secondary charging and energy storage, aerospace and other fields because of their advantages such as high energy density, long cycle life, and low self-discharge rate. The performance of lithium-ion batteries largely depends on the cathode material. At present, lithium manganese oxide materials are widely used as cathode materials for lithium-ion batteries because of their advantages such as good safety, non-toxicity, low pollution, abundant resources, and low cost. However, the low energy density of lithium manganate limits its application. [0003] Nickel-cobalt-aluminium-lithium materials have high energy density, ...

AI Technical Summary

Problems solved by technology

The performance of lithium-ion batteries largely depends on the cathode material. At present, lithium manganese oxide materials are widely used as cathode materials for lithium-ion batteries because of their advantages such as good safety, non-toxicity, low pollution, abundant resources, and low cost. However, the disadvantage of low energy density of lithium manganate limits its application.

[0003] Nickel-cobalt-aluminum-lithium materials have high energy density, but also have many disadvantages, such as poor cycle performance and poor safety performance, which limit their application in lithium-ion batteries

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