Nickel cobalt lithium manganate composite anode material of lithium ion battery and preparation method of nickel cobalt lithium manganate composite anode material

Abstract

The invention relates to a nickel cobalt lithium manganate composite anode material of a lithium ion battery and a preparation method of the nickel cobalt lithium manganate composite anode material, and belongs to the technical field of anode materials of lithium ion batteries. The composite anode material comprises nickel cobalt lithium manganate and lithium lanthanum titanate wrapping the surface of the nickel cobalt lithium manganate. The chemical formula of the composite anode material is LiNixCoyMn(1-x-y) O2 / LizLa (2-z) / 3TiO3, x is greater than 1 and smaller than 1, y is greater than 0 and smaller than 1, (x+y) is greater than 1 and smaller than 1, z is greater than or equal to 0.5 and smaller than or equal to 1.5, and the mass percent of the lithium lanthanum titanate is 0.5-1.5%wt. A layer of stable conductive materials which are the lithium lanthanum titanate wraps the surface of the nickel cobalt lithium manganate composite anode material. On one hand, the structure of the nickel cobalt lithium manganate composite anode material is quite stable; and on the other hand, the ionic conductivity of the nickel cobalt lithium manganate material is quite high, so that dissolution of the nickel cobalt lithium manganate material is restrained, the conductivity is improved, and the rate capability and the recycling performance of the material are greatly improved.

Description

technical field [0001] The invention relates to a lithium ion battery composite negative electrode material and a preparation method thereof. More specifically, the invention relates to a lithium ion battery nickel-cobalt lithium manganate composite positive electrode material and a preparation method thereof, belonging to the technical field of lithium battery positive electrode materials. Background technique [0002] Lithium-ion battery, as a new type of green battery, has developed rapidly since it came out. Among them, the cathode material is an important factor restricting the development of lithium-ion batteries. At present, the widely used lithium-ion battery cathode materials in the market mainly include lithium cobalt oxide, lithium nickel cobalt manganese oxide, lithium manganese oxide and lithium iron phosphate. [0003] Nickel cobalt lithium manganese oxide material combines the advantages of lithium cobalt oxide, lithium manganese oxide and lithium nickel oxid...

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Problems solved by technology

[0007] The present invention aims to solve the problem that nickel-cobalt-lithium-manganese-oxide material in the prior art is easy to dissolve and has low conductivity, and provides a lithium-ion battery nickel-cobalt-lithium manganate composite positive electrode material, the surface of which is coated with a layer of stable conductive material Lithium lanthanum titanate, on the one hand, inhibits the dissolution of nickel-cobalt lithium manganese oxide materials, and on the other hand, improves the electrical conductivity, thereby greatly improving the rate performance and cycle performance of the material

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