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Lithium ion supplementing technology of lithium ion batteries

A technology for lithium-ion batteries and lithium supplementation, which is applied in the fields of battery electrodes, electrolyte storage batteries, non-aqueous electrolyte storage batteries, etc. It can solve the problems of irreversible capacity loss, achieve the elimination of irreversible capacity loss, improve cycle stability, and reduce volume deformation Effect

Active Publication Date: 2018-09-11
WANXIANG 123 CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method to improve the cycle stability of lithium-ion batteries based on silicon-carbon negative electrodes in order to solve the problem that the irreversible capacity loss caused by the formation of SEI film on the negative electrode has not been effectively solved when the silicon-carbon negative electrode is charged for the first time. lithium-ion battery lithium replenishment process

Method used

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Examples

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Embodiment 1

[0029] A lithium-ion battery supplement lithium process, the preparation method of the silicon carbon negative pole piece is:

[0030] 1) Glue compounding: Take 0.5 parts by weight of hydroxymethylcellulose sodium powder and pour it into the aqueous solution, stir quickly at 2000rpm, add 0.5 parts by weight of polyacrylate, mix until the solid content of the glue is 5%, stir slowly at 400rpm for 30min , to get the glue;

[0031] 2) Add conductive agent: add conductive agent Super P of 1% by weight of the glue solution to the glue solution obtained in step 1), and stir rapidly at 2000rpm for 2 hours to obtain a conductive solution;

[0032] 3) Add the main material: add 10 parts by weight of SiO negative electrode powder to the conductive liquid obtained in step 2), stir slowly at 400 rpm for 10 minutes, then stir quickly at 2000 rpm for 1 hour; then add 1 part by weight of hard carbon, and stir slowly at 400 rpm for 10 minutes, Add deionized water to adjust the stirring consi...

Embodiment 2

[0044] A lithium-ion battery supplement lithium process, the preparation method of the silicon carbon negative pole piece is:

[0045] 1) Glue compounding: Take 3 parts by weight of hydroxymethylcellulose sodium powder and pour it into the aqueous solution, stir quickly at 3000rpm, add 2 parts by weight of polyacrylate, mix until the solid content of the glue is 15%, stir slowly at 800rpm for 30min , to get the glue;

[0046] 2) Add conductive agent: add conductive agent Super P with 45% glue weight to the glue solution obtained in step 1), and stir rapidly at 3000rpm for 2 hours to obtain conductive solution;

[0047]3) Add the main material: add 55 parts by weight of SiO negative electrode powder to the conductive liquid obtained in step 2), stir slowly at 800 rpm for 10 minutes and then stir quickly at 3000 rpm for 1 hour; then add 6 parts by weight of natural graphite and 6 parts by weight of soft carbon , after stirring slowly at 800rpm for 10min, add deionized water to ...

Embodiment 3

[0059] A lithium-ion battery supplement lithium process, the preparation method of the silicon carbon negative pole piece is:

[0060] 1) Glue compounding: Take 5 parts by weight of hydroxymethyl cellulose sodium powder and pour it into the aqueous solution, stir quickly at 4000rpm, add 3 parts by weight of polyacrylate, mix until the solid content of the glue is 25%, stir slowly at 1200rpm for 30min , to get the glue;

[0061] 2) Add conductive agent: add conductive agent Super P with 70% glue weight to the glue solution obtained in step 1), and stir rapidly at 4000rpm for 2 hours to obtain conductive solution;

[0062] 3) Add the main material: add 92 parts by weight of SiO negative electrode powder to the conductive liquid obtained in step 2), stir slowly at 1200 rpm for 10 minutes and then stir quickly at 4000 rpm for 1 hour; then add 20 parts by weight of artificial graphite, and stir slowly at 1200 rpm for 10 minutes, Then add 10 parts by weight of styrene-butadiene rub...

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Abstract

The invention relates to a lithium ion supplementing technology of lithium ion batteries. The technology includes firstly, preparing a silicon carbon negative pole piece; then preparing a Li-naphthalene solution; soaking the prepared silicon carbon negative pole piece in the Li-naphthalene solution for 2 hours; and performing leaching. The silicon carbon negative pole piece is embedded with a certain amount of lithium ion before a battery is prepared, and irreversible capacity losses due to an SEI film which is formed by embedding lithium ions into a negative pole for the first time can be eliminated. Under the same charging and discharging depth, volume deformation amplitude reduction of silicon based negative materials during a lithium ion embedding and extracting process after the lithium ion supplementing can help improve the cyclic stability of silicon carbon negative pole based lithium ion batteries. Through experimental confirmation, charging and discharging efficiency of the silicon carbon negative pole for the first time can be significantly enhanced, and the cyclic stability can be improved as well.

Description

technical field [0001] The invention relates to lithium-ion batteries, in particular to a lithium-ion battery replenishment process for improving the cycle stability of lithium-ion batteries based on silicon-carbon negative electrodes. Background technique [0002] The theoretical capacity of lithium intercalation of silicon is as high as 4200mAh / g, which is more than 10 times that of the current commercial negative electrode graphite material (theoretical capacity 372mAh / g), and has important application prospects. However, the first charge and discharge efficiency of lithium-ion batteries based on silicon-carbon anodes is much lower than that of current commercial graphite anodes. The main reason is that after the lithium ions of the cathode material are inserted into the anode during the first charge, the lithium ions forming the SEI film cannot be reversibly extracted. The problem of low initial charge and discharge efficiency has brought about a large loss of energy den...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/058H01M4/1393H01M4/1395H01M4/587H01M4/38H01M4/36
CPCH01M4/1393H01M4/1395H01M4/362H01M4/386H01M4/587H01M10/058Y02E60/10Y02P70/50
Inventor 石先兴严红王慧敏
Owner WANXIANG 123 CO LTD
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