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

Electrolyte, preparation method thereof and lithium ion battery

An electrolyte and lithium salt technology, applied in the field of electrolyte and its preparation method and lithium ion battery, can solve the problems of reducing the discharge capacity retention rate of lithium ion battery, deteriorating the cycle stability of lithium ion battery, etc., so as to be convenient for large-scale application , High temperature cycle stability performance and discharge capacity retention rate improvement, the effect of excellent high temperature cycle stability performance and discharge capacity retention rate

Active Publication Date: 2020-02-04
ZHUHAI COSMX BATTERY CO LTD
View PDF11 Cites 10 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, compared with conventional lithium cobalt oxide cathodes, high-capacity high-nickel materials as cathodes will degrade the cycle stability of lithium-ion batteries, especially high-temperature cycle stability, and significantly reduce the lithium-ion battery capacity when discharged at a high rate. discharge capacity retention

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, preparation method thereof and lithium ion battery
  • Electrolyte, preparation method thereof and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0043] The present invention also provides a preparation method for any one of the lithium-ion batteries described above, comprising: mixing a solvent, a lithium salt, and an additive under an inert atmosphere to obtain an electrolyte.

[0044] The solvent in the preparation method is composed of a cyclic carbonate solvent and a chain carbonate solvent, and the mass ratio of the cyclic carbonate solvent in the electrolyte is 1.5-20%, and the chain carbonate solvent is The mass proportion in the electrolyte is 47-86.1%;

[0045] The lithium salt in the preparation method is lithium hexafluorophosphate, and lithium bisfluorosulfonyl imide and / or lithium bistrifluoromethanesulfonyl imide;

[0046] The additive in the preparation method is selected from one or more of vinyl sulfite, lithium difluorobisoxalate borate, lithium difluorobisoxalate phosphate, vinylene carbonate and thiophene.

[0047] Specifically, it can be carried out in a glove box (moisture <10 ppm, oxygen <1 ppm)...

Embodiment 1

[0069] The electrolyte solution of this embodiment includes the following components according to mass percentage: ethylene carbonate 3%, dimethyl carbonate 66%, methyl ethyl carbonate 16%, vinyl sulfite 0.5%, difluorobisoxalate lithium borate 0.5% %, lithium hexafluorophosphate 4%, lithium bisfluorosulfonimide 10%.

[0070] Ethylene carbonate, dimethyl carbonate, ethyl methyl carbonate, vinyl sulfite, lithium difluorobisoxalate borate, lithium hexafluorophosphate, and lithium bisfluorosulfonimide were mixed according to the above proportions to obtain the electrolyte solution of this embodiment.

[0071] The electrolyte in this embodiment is matched with LiNi 0.8 co 0.1 mn 0.1 o 2 The positive electrode, PP diaphragm and graphite negative electrode are assembled into Li-ion battery 1#.

Embodiment 2

[0073] The electrolyte solution of this embodiment includes the following components according to mass percentage: 8.5% ethylene carbonate, 70% dimethyl carbonate, 4% ethyl methyl carbonate, 1.5% vinylene carbonate, 8% lithium hexafluorophosphate, difluorosulfonic acid Lithium imide 8%.

[0074] Ethylene carbonate, dimethyl carbonate, ethyl methyl carbonate, vinylene carbonate, lithium hexafluorophosphate, and lithium bisfluorosulfonimide were mixed according to the above proportions to obtain the electrolyte solution of this embodiment.

[0075] The electrolyte in this embodiment is matched with LiNi 0.8 co 0.1 mn 0.1 o 2 The positive electrode, PP diaphragm and graphite negative electrode are assembled into Li-ion battery 2#.

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 provides an electrolyte, a preparation method thereof and a lithium ion battery. The electrolyte comprises a solvent, a lithium salt and an additive, wherein the solvent is composed of acyclic carbonate solvent and a chain carbonate solvent, the mass ratio of the cyclic carbonate solvent in the electrolyte is 1.5-20%, and the mass ratio of the chain carbonate solvent in the electrolyte is 47-86.1%; the lithium salt is lithium hexafluorophosphate, and lithium bis(fluorosulfonyl)imide and / or bistrifluoromethanesulfonimide lithium; and the additive is selected from one or more of ethylene sulfite, lithium oxalyldifluoro borate, lithium difluoro(bisoxalate)phosphate, vinylene carbonate and thiophene. The electrolyte can enable the lithium ion battery to have excellent dischargecapacity retention ratio and high-temperature cycling stability.

Description

technical field [0001] The invention relates to an electrolyte, a preparation method thereof and a lithium ion battery, belonging to the technical field of lithium ion batteries. Background technique [0002] Lithium-ion battery is an ideal mobile power source. Due to its small size, light weight, high discharge voltage, and no memory effect, more than 95% of smart electronic products such as camcorders, laptops, and drones have been used A lithium-ion battery serves as the main power source. In recent years, with the rapid development of smart electronic products, people have put forward higher requirements for the further optimization of the battery life of lithium-ion batteries. At this stage, using high-capacity high-nickel materials as the positive electrode is a common way to increase the energy density of lithium-ion batteries. [0003] However, compared with conventional lithium cobalt oxide cathodes, high-capacity high-nickel materials as cathodes will degrade the...

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
IPC IPC(8): H01M10/0569H01M10/0567H01M10/0568H01M10/058H01M10/0525H01M10/42
CPCH01M10/0525H01M10/0567H01M10/0568H01M10/0569H01M10/058H01M10/4235H01M2300/0037Y02E60/10Y02P70/50
Inventor 廖波王海李素丽李俊义徐延铭
Owner ZHUHAI COSMX BATTERY 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