Lithium ion battery electrolyte and lithium ion battery

A lithium-ion battery and electrolyte technology, applied in secondary batteries, circuits, electrical components, etc., can solve the problem of testing temperature range that cannot meet the high energy density requirements of batteries, and achieve improved low-temperature cycle performance, improved cycle performance, The effect of reducing impedance

Inactive Publication Date: 2018-11-06
CHINA AVIATION LITHIUM BATTERY LUOYANG +1
View PDF6 Cites 25 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The electrolyte solution takes into account the high temperature performance and low temperature performance of the battery by adding the synergistic effect between the gas expansion inhibitor and the low impedance additive, but the low temperature performance of the electrolyte described in the above technology is only the cycle performanc...

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
  • Lithium ion battery electrolyte and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The lithium ion battery electrolyte of the present embodiment is made up of organic solvent, electrolyte lithium salt, low-impedance additive and functional additive; The lithium salt that adopts is lithium hexafluorophosphate; Composed of lithium phosphate; the functional additive used is tris(trimethylsilane) borate; the organic solvent used is composed of ethylene carbonate, ethyl methyl carbonate, diethyl carbonate and fluoroethylene carbonate, carbonic acid The mass ratio of vinyl ester 20%, ethyl methyl carbonate 50%, diethyl carbonate and fluoroethylene carbonate is 20:50:20:10; in lithium-ion battery electrolyte, the concentration of electrolyte lithium salt is 1.0mol / L, the mass fraction of lithium difluorophosphate is 0.5%, the mass fraction of lithium difluorobisoxalate phosphate is 1%, and the mass fraction of functional additives is 0.5%.

[0037] The lithium-ion battery electrolyte in this embodiment is obtained by adding electrolyte lithium salt, low-imp...

Embodiment 2

[0040]The lithium ion battery electrolyte of the present embodiment is made up of organic solvent, electrolyte lithium salt, low-impedance additive and functional additive; The lithium salt that adopts is lithium hexafluorophosphate; Composed of lithium phosphate; the functional additive used is tris(trimethylsilane) phosphate; the organic solvent used is composed of propylene carbonate, ethyl methyl carbonate, diethyl carbonate and fluoroethylene carbonate, propylene carbonate The mass ratio of ester, ethyl methyl carbonate, diethyl carbonate and fluoroethylene carbonate is 20:50:20:10; in lithium-ion battery electrolyte, the concentration of electrolyte lithium salt is 1.0mol / L, difluorophosphoric acid The mass fraction of lithium is 0.5%, the mass fraction of lithium difluorobisoxalate phosphate is 1%, and the mass fraction of functional additives is 0.5%.

[0041] The lithium-ion battery electrolyte in this embodiment is obtained by adding electrolyte lithium salt, low-imp...

Embodiment 3

[0044] The lithium ion battery electrolyte of the present embodiment is made up of organic solvent, electrolyte lithium salt, low-impedance additive and functional additive; It is composed of lithium difluorophosphate and lithium difluorobisoxalate phosphate; the functional additive used is tris(trimethylsilane) borate; the organic solvent used is composed of ethylene carbonate, ethyl methyl carbonate, diethyl carbonate ester and fluoroethylene carbonate, the mass ratio of ethylene carbonate, ethyl methyl carbonate, diethyl carbonate and fluoroethylene carbonate is 20:50:20:10; in lithium ion battery electrolyte, the concentration of lithium hexafluorophosphate 0.9mol / L, the concentration of lithium bis(fluorosulfonyl)imide is 0.1mol / L, the mass fraction of lithium difluorophosphate is 0.5%, the mass fraction of lithium difluorobisoxalate phosphate is 0.5%, functional additive The mass fraction is 0.5%.

[0045] The lithium-ion battery electrolyte in this embodiment is obtain...

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 a lithium ion battery electrolyte and a lithium ion battery, and belongs to the technical field of lithium ion batteries. The lithium ion battery electrode comprises an organic solvent, an electrolyte lithium salt, a low-impedance additive and a functional additive, wherein the low-impedance additive comprises lithium difluorophosphate and lithium difluoro bis(oxalato) phosphate, the functional additive is an arbitrary one or a combination of tris(trimethylsilyl) borate and tris(trimethylsilyl) phosphate, and the functional additive accounts for 0.1-4% of the total mass of the lithium ion battery electrolyte. The lithium ion battery electrolyte can participate in negative electrode film formation, the interface impedance of the electrolyte is reduced, and the low-temperature performance of the electrolyte is improved; and a flexible and high-temperature stable electrode interface film also can be formed on a surface of a high-capacity silicon carbon composite negative electrode material, the breakage of an SEI film caused by silicon expansion during the circulation process is timely repaired, and the cycle property of the silicon carbon negative electrode lithium ion battery is improved.

Description

technical field [0001] The invention relates to a lithium ion battery electrolyte and a lithium ion battery, belonging to the technical field of lithium ion batteries. Background technique [0002] Since the commercialization of lithium-ion batteries in the 1990s, they have received extensive attention due to their superior performance in all aspects. However, with the gradual development of electric vehicles, people have put forward higher requirements for the energy density of lithium-ion batteries. [0003] The current commercial lithium-ion battery anode material uses graphite anode material, which has a low charge-discharge specific capacity and a theoretical capacity of 372mAh / g, which cannot meet the current demand for high-energy-density chemical power sources for electric vehicles. Due to its high theoretical specific capacity (4200mAh / g), low delithiation potential (<0.5V), and abundant content, silicon-based materials have become one of the most ideal candidat...

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): H01M10/0525H01M10/0567
CPCH01M10/0525H01M10/0567Y02E60/10
Inventor 余琦仝俊利马国华支岩辉徐云辉
Owner CHINA AVIATION LITHIUM BATTERY LUOYANG
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap