Positive electrode lithium supplementing material and lithium ion battery comprising same

A technology for lithium ion batteries and positive electrodes, which is applied in the field of positive electrode lithium supplement materials and their preparation, can solve the problems of poor surface structure stability and high residual alkali value, and achieve the effects of improving energy density, reducing residual alkali value, and inhibiting gas production.
CN113178567APending Publication Date: 2021-07-27ZHUHAI COSMX BATTERY CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
ZHUHAI COSMX BATTERY CO LTD
Publication Date
2021-07-27

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Abstract

The invention provides a positive electrode lithium supplementing material and a lithium ion battery comprising the positive electrode lithium supplementing material, the lithium supplementing material is coated in a special surface coating mode, and the purposes of stabilizing the stability of the surface structure of the material and reducing the residual alkali value are achieved. Meanwhile, the problems that a large amount of gas is easily generated in the charging and discharging process, the structure is unstable, and then a series of side reactions are caused can be solved. Zirconium dioxide is adopted as a coating layer and coats the surface of Li2NiO2, on one hand, zirconium dioxide is used as a non-active material, has a porous structure and inhibits erosion of HF in an electrolyte to protect a Li2NiO2 body material, and meanwhile, free deintercalation of lithium ions can be allowed; on the other hand, the reaction with residual lithium on the surface of Li2NiO2 is carried out, the residual alkali value of the material is reduced, and the gas production problem of the battery is effectively inhibited, so that a stable surface structure is obtained.
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Description

technical field

[0001] The invention belongs to the technical field of lithium ion batteries, and mainly relates to a positive electrode lithium supplement material, a preparation method thereof and a lithium ion battery comprising the positive electrode lithium supplement material. Background technique

[0002] At present, during the first charging process of commercial lithium-ion batteries, about 10wt% of the active lithium in the positive electrode material is consumed, and an irreversible and stable SEI film is formed on the surface of the negative electrode, resulting in irreversible capacity loss, which in turn leads to a decrease in the energy density of lithium-ion batteries. . In response to this problem, the loss of this part of irreversible capacity can usually be eliminated by supplementing lithium at the positive electrode, and the energy density and other electrical properties of the battery can be improved.

[0003] For example by choosing Li 2 NiO 2 mater...

Claims

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