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

Electrolyte, lithium ion battery and formation method

An electrolyte and lithium salt technology, applied in the field of electrochemistry, can solve the problems of vinyl sulfate aggravation, large battery volume changes, affecting battery performance and safety, etc., to improve efficiency and safety, avoid massive gas production, The effect of suppressing the problem of battery gas generation

Active Publication Date: 2021-04-23
宁德国泰华荣新材料有限公司
View PDF9 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the actual use process, the additive will cause the battery to generate a large amount of gas during the formation process, resulting in excessive changes in the volume of the battery during formation, affecting the performance and safety of the battery
The inventor researched that the main component of the gas produced during the chemical formation process is ethylene, and the main decomposition potential is 3-3.6V. At this potential, ethylene carbonate (EC) in the electrolyte begins to decompose, resulting in a large amount of gas. The addition of ethylene sulfate (DTD) will exacerbate this reaction

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
  • Electrolyte, lithium ion battery and formation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] in an argon-filled glove box (H 2 O6 ) in it, add ethylene sulfate (DTD) of 2% of the total amount of the electrolyte and 1% of the total amount of the electrolyte LiBOB and 1% of the total amount of the electrolyte of vinylene carbonate (VC ). Prepare a lithium-ion battery containing the electrolyte (the positive pole is NCM, the negative pole is graphite), and the battery is formed by charging and discharging at 0.1C. The volume and thickness before and after formation are tested, and the volume is measured by the drainage method. The test results are shown in Table 1.

Embodiment 2

[0035] in an argon-filled glove box (H 2O6 ) in it, add ethylene sulfate (DTD) of 2% of the total amount of the electrolyte and 1% of the total amount of the electrolyte LiDBOB and 1% of the total amount of the electrolyte of vinylene carbonate ( VC). Prepare a lithium-ion battery containing the electrolyte (the positive pole is NCM, the negative pole is graphite), and the battery is formed by charging and discharging at 0.1C. The volume and thickness before and after formation are tested, and the volume is measured by the drainage method. The test results are shown in Table 1.

Embodiment 3

[0037] in an argon-filled glove box (H 2 O6 ) in it, add ethylene sulfate (DTD) of 2% of the total amount of the electrolyte and 1% of the total amount of the electrolyte LiBOB of 1% of the total amount of the electrolyte and 1-3 propane sulfone of the total amount of the electrolyte ester. Prepare a lithium-ion battery containing the electrolyte (the positive pole is NCM, the negative pole is graphite), and the battery is formed by charging and discharging at 0.1C. The volume and thickness before and after formation are tested, and the volume is measured by the drainage method. The test results are shown in Table 1.

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

No PUM Login to View More

Abstract

The invention relates to an electrolyte. The electrolyte comprises an organic solvent, a lithium salt and additives; the additives comprise ethylene sulfate, a lithium salt additive and a film forming additive; the lithium salt additive is one or a combination of more of lithium difluoro(oxalato) borate, lithium bis (oxalato) borate, lithium tetrafluoroborate and lithium difluoro bis (oxalato) phosphate; the film forming additive is one or a combination of more of vinylene carbonate, 1-3 propane sultone, vinylene carbonate, fluoroethylene carbonate and propylene sulfate. The additive combination used in the electrolyte of the invention can well inhibit the problem of battery gas production caused by addition of ethylene sulfate (DTD) in the battery formation process, greatly improves the battery production efficiency and safety, and does not influence other performances of the battery. A good protective film formed after formation can further improve the cycle and high-low temperature performance of the battery.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry, and in particular relates to an electrolytic solution, a lithium ion battery and a formation method. Background technique [0002] As a clean and convenient energy source, lithium-ion batteries play a very important role in people's daily life. More and more electrical equipment needs to use lithium-ion batteries to provide energy for them. Formation, as an important step in the manufacture of lithium-ion batteries, is extremely critical to the performance of lithium-ion batteries. The main function of chemical formation is to form a dense protective film on the surface of the negative electrode of the battery, which can effectively prevent the co-embedding of solvent molecules and avoid the damage to the electrode material caused by the co-embedding of solvent molecules, thus greatly improving the cycle performance of the electrode and service life. Among them, vinyl sulfate (DTD) is ...

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 Applications(China)
IPC IPC(8): H01M10/0567H01M10/0525H01M10/42
CPCH01M10/0525H01M10/0567H01M10/4235H01M2300/0025Y02E60/10
Inventor 顾名遥陈晓琴刘春彦甘朝伦赵世勇
Owner 宁德国泰华荣新材料有限公司
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