Cathode material, preparation method thereof and lithium ion battery containing same

Abstract

The application relates to the field of processing of a lithium battery, in particular to a cathode material, a preparation method thereof and a lithium ion battery containing the same. The cathode material comprises a lithium-containing cathode material and an indium oxide cladding layer coated on the surface of the lithium-containing cathode material. The preparation method comprises the following steps of: adding a soluble indium salt into a solution dissolved with an alkaline substance and stirring to form a sol; adding the lithium-containing cathode material into the sol and stirring to lead a generated sediment to be uniformly deposited and attached onto the surface of the lithium-containing cathode material; removing a liquid to obtain a lithium-containing cathode material solid body attached with the sediment; and roasting the lithium-containing cathode material solid body attached with the sediment to form the lithium ion cathode material coated with indium oxide on the surface. Compared with other inertia cladding materials such as aluminum oxide, the cathode material provided by the invention has the advantages that the electronic conductivity of indium oxide is excellent, and moreover, the discharging specific capacity, the cycling performance and the safety performance under high voltage can be obviously improved.

Description

technical field [0001] The present application relates to the field of lithium battery processing, in particular to a positive electrode material, a preparation method thereof, and a lithium ion battery containing the positive electrode material. Background technique [0002] With the miniaturization and thinning of portable electronic devices such as mobile phones, digital cameras, and notebook computers, the market's requirements for energy density, safety performance, and cycle life of lithium-ion batteries are also increasing. [0003] Lithium-ion batteries generally include: a positive electrode sheet, a negative electrode sheet, a separator between the spacer and the positive and negative electrode sheets, and an electrolyte, wherein the positive electrode sheet includes a positive current collector and a positive electrode material distributed on the positive electrode collector, and the negative electrode sheet includes a negative A current collector and a negative e...

AI Technical Summary

Problems solved by technology

However, the above cathode materials have their own disadvantages: LiCoO 2 When the charging voltage exceeds 4.2V, the structure is unstable and the safety becomes poor; LiNiCoO 2 The structure of LiMn is unstable and has strong oxidizing property to the electrolyte; LiMn 2 o 4 poor high temperature performance

However, the process of the above method is difficult to control, and the consistency of the obtained product cannot be guaranteed.

Another example is that the Chinese invention patent application CN200510034893.2 adopts the organosol method to treat LiCoO 2 Surface coating, although a positive electrode material with a uniform surface coating can be obtained, the process control is complicated and the materials such as titanate and silicate used are expensive, which is not conducive to improving the cost performance of lithium-ion batteries

[0005] Therefore, there is currently no positive electrode material with excellent comprehensive performance.

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