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Method for lithium supplement of lithium ion battery negative electrode plate, lithium-supplement negative electrode plate and lithium ion battery

A technology for lithium-ion batteries and negative electrodes, which is applied in lithium-ion battery negative electrodes, lithium-supplemented negative electrodes, and lithium-ion batteries. It can solve the problems of high toxicity of lithium sources, improve the cycle capacity retention rate, and benefit the industry. The effect of production and improvement of the first Coulombic efficiency

Inactive Publication Date: 2019-06-14
沁新集团(天津)新能源技术研究院有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to solve the problem of high toxicity of the lithium source in the prior art, and provide a method for supplementing lithium to the negative electrode sheet of a lithium ion battery, a lithium replenishing negative electrode sheet and a lithium ion battery

Method used

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  • Method for lithium supplement of lithium ion battery negative electrode plate, lithium-supplement negative electrode plate and lithium ion battery

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Effect test

Embodiment 1

[0028] At room temperature, lithium carbonate is dissolved in aqueous carbonic acid solution to form a lithium bicarbonate aqueous solution with a concentration of 0.02M, and then the lithium bicarbonate aqueous solution is evenly sprayed on the negative electrode sheet (the negative electrode active material is artificial graphite, Jiangxi Zichen Technology Co., Ltd., brand The surface of FT-1, the same below), was dried at 90° C. and 0.05 MPa for 6 hours to obtain a lithium-supplementing negative electrode sheet containing 1% by weight of lithium carbonate on the surface.

Embodiment 2

[0030] At room temperature, lithium carbonate was dissolved in aqueous carbonic acid solution to form a lithium bicarbonate aqueous solution with a concentration of 0.03M, and then the lithium bicarbonate aqueous solution was evenly sprayed on the surface of the negative electrode sheet, and dried at 95°C and 0.1MPa for 2 hours to obtain a surface containing A lithium-replenishing negative electrode sheet of 3% by weight lithium carbonate.

Embodiment 3

[0032] At room temperature, lithium carbonate was dissolved in aqueous carbonic acid solution to form an aqueous solution of lithium bicarbonate with a concentration of 0.06M, and then the aqueous solution of lithium bicarbonate was evenly sprayed on the surface of the negative electrode sheet, and dried at 85°C and 0.01MPa for 8 hours to obtain a surface containing Lithium-supplementing negative electrode sheet with 6% by weight lithium carbonate.

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Abstract

The invention relates to the field of lithium ion batteries, in particular to a method for lithium supplement of a lithium ion battery negative electrode plate, a lithium-supplement negative electrodeplate and a lithium ion battery. The method for the lithium supplement of the lithium ion battery negative electrode plate comprises the step of drying the negative electrode plate and a lithium hydrogencarbonate solution after contact to obtain the lithium-supplement negative electrode plate. The invention also provides the lithium ion battery fabricated by the lithium-supplement negative electrode plate. The lithium ion battery is obtained by assembly and formation of the lithium-supplement negative electrode plate, a positive electrode plate, a separator and an electrolyte. According to the method for lithium supplement of the lithium ion battery negative electrode plate, the employed lithium hydrogencarbonate solution (lithium source) is not toxic, the problem of safety does not exist, the method can be performed without protection of inert gas, and industrial production is facilitated; and moreover, the lithium ion battery provided by the invention employs the negative electrodeplate subjected to lithium supplement (namely, the negative electrode plate comprising lithium carbonate on a surface) and a lithium carbonate-containing electrolyte, the negative electrode plate andthe electrolyte are jointly matched, and the initial coulombic efficiency and the cycle capacity retention rate of the battery are greatly improved.

Description

technical field [0001] The invention relates to the field of lithium-ion batteries, in particular to a lithium-replenishing method for a negative electrode sheet of a lithium-ion battery, a lithium-replenishing negative electrode sheet and a lithium-ion battery. Background technique [0002] Due to the advantages of high voltage, high energy density and long cycle life, lithium-ion batteries have become one of the most widely used secondary batteries. However, with the development of portable electronic devices, electric bicycles and electric vehicles, the requirements for performance such as energy density of lithium-ion batteries are getting higher and higher. [0003] The first coulombic efficiency of a lithium-ion battery is an important factor affecting the performance of a lithium-ion battery. For the negative electrode, the formation of a solid electrolyte film (SEI film) on the surface of the negative electrode during the first charging process will consume part of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1393H01M4/1395H01M4/04H01M4/133H01M4/134H01M10/0566H01M10/0525
CPCY02E60/10
Inventor 王宏栋
Owner 沁新集团(天津)新能源技术研究院有限公司
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