Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

A kind of Lithium-ion battery replenishment technology

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

Active Publication Date: 2020-07-31
WANXIANG 123 CO LTD
View PDF9 Cites 0 Cited by
  • 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A kind of Lithium-ion battery replenishment technology
  • A kind of Lithium-ion battery replenishment technology

Examples

Experimental program
Comparison scheme
Effect test

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, Add deionized water to adjust the stirring consisten...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
densityaaaaaaaaaa
densityaaaaaaaaaa
densityaaaaaaaaaa
Login to View More

Abstract

The invention relates to a process for replenishing lithium of a lithium-ion battery. The process for replenishing lithium comprises: first preparing a silicon-carbon negative pole piece, then preparing a Li-naphthalene solution, and putting the prepared silicon-carbon negative pole piece into the Li-naphthalene solution Soaked for 2 hours, obtained after rinsing. In the present invention, before making the battery, a certain amount of lithium is embedded in the silicon-carbon negative electrode sheet to eliminate the irreversible capacity loss caused by the first lithium ion intercalation in the negative electrode to form an SEI film. Under the same charge and discharge depth, the volume deformation of silicon-based negative electrode materials during the lithium ion intercalation and extraction process is reduced after lithium supplementation, which will help improve the cycle stability of silicon-carbon negative electrode lithium-ion batteries. It is confirmed by experiments that the lithium supplementation method can significantly improve the first charge and discharge efficiency of the silicon-based negative electrode, and improve the cycle stability performance.

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com