Lithium supplementing method for the lithium ion battery positive electrode

A lithium-ion battery and positive electrode technology, which is applied in the field of lithium-ion battery positive electrode lithium supplementation, can solve the problems of low initial battery efficiency, improve initial efficiency and battery capacity, avoid dust pollution and safety issues, and increase energy density.

Inactive Publication Date: 2019-08-13
湖北猛狮新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to overcome the deficiencies in the prior art, the purpose of the invention is to provide a method for replenishing lithium at ...

Method used

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  • Lithium supplementing method for the lithium ion battery positive electrode

Examples

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Effect test

Embodiment 1

[0015] Example 1: In the positive electrode pulping process, the Li 5 FeO 4 The lithium supplement material is mixed evenly with the main material of lithium cobalt oxide, SUPER-P conductive agent, PVDF binder and NMP solvent, among which Li 5 FeO 4 The amount of lithium cobalt oxide is 2% of the weight of lithium cobalt oxide, and then lithium-ion batteries are made through processes such as coating, rolling, assembly, liquid injection, formation, and volume separation.

Embodiment 2

[0016] Example 2: In the positive electrode pulping process, the Li 5 FeO 4 The lithium supplement material is mixed evenly with the main material of lithium manganese oxide, SUPER-P conductive agent, PVDF binder and NMP solvent, among which Li 5 FeO 4 The amount of lithium manganate is 1% of the weight of lithium manganate, and then the lithium-ion battery is made into a lithium-ion battery through processes such as coating, rolling, assembly, liquid injection, formation, and volume separation.

Embodiment 3

[0017] Example 3: During the positive electrode pulping process, the Li2MnO3-LiNiCoMnO2 lithium supplement material is mixed with the main material of nickel-cobalt lithium manganese oxide, SUPER-P, kS-6 conductive agent, PVDF binder and NMP solvent and other materials, wherein The amount of Li2MnO3-LiNiCoMnO2 is 5% of the weight of nickel-cobalt lithium manganese oxide, and then the lithium-ion battery is made through processes such as coating, rolling, assembly, liquid injection, formation, and volume separation.

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Abstract

The invention relates to a lithium supplementing method for a lithium ion battery positive electrode. The method is used for supplementing lithium for the lithium ion battery positive electrode. In apositive electrode pulping process, a lithium supplementing material is uniformly mixed with a positive electrode main material, a conductive agent, a binding agent, a solvent and other materials, andthen the lithium battery is prepared through the procedures of coating, rolling, assembling, liquid injecting, formation, capacity grading and the like. Compared with the prior art, the process doesnot need to be changed, and operation is easy; inert atmosphere protection is not needed; no special requirement on the environment is needed; the existing production process and equipment do not needto be improved; the lithium supplementing material is uniformly mixed with materials such as a main material, a binder and a conductive agent in the positive electrode pulping process under the existing production environment, equipment and process conditions; and the additional equipment cost does not need to be increased. The method belongs to 'wet processes for lithium supplement', and dust pollution and safety problems caused by dry processes for lithium supplement are avoided. After the lithium ion battery is supplemented with lithium, the initial efficiency and the battery capacity canbe improved, so that the energy density of the battery is increased.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a method for replenishing lithium at the positive electrode of the lithium ion battery. Background technique [0002] Lithium-ion batteries have become one of the most widely used secondary batteries due to their advantages such as high voltage, high energy density and long cycle life. However, with the miniaturization of portable electronic devices, the continuous development of long-term standby, and the use of high-power and high-energy devices such as electric bicycles and electric vehicles, the energy density of lithium-ion batteries as energy storage power sources has been increasingly raised. high demands. [0003] During the first charging process of the battery, the solid electrolyte interface film formed on the surface of the negative electrode will consume part of the Li migrated from the positive electrode. + , resulting in Li in the cathode material ...

Claims

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Application Information

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IPC IPC(8): H01M4/04H01M4/505H01M4/525H01M10/0525H01M4/485
CPCH01M4/0402H01M4/485H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 李董轩赖见李青海刘进康书文袁智斌
Owner 湖北猛狮新能源科技有限公司
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