Unlock instant, AI-driven research and patent intelligence for your innovation.

Electrolyte for high-nickel positive electrode material lithium ion battery

A technology for lithium ion batteries and positive electrode materials, applied in secondary batteries, organic electrolytes, non-aqueous electrolytes, etc., can solve problems such as unsolvable electrolyte problems and inappropriateness, achieve good cycle stability and rate performance, and inhibit hydrolysis. , the effect of improving stability

Inactive Publication Date: 2020-11-06
ZHEJIANG UNIV OF TECH
View PDF7 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is not suitable for high-nickel cathode materials, and it cannot solve the problems mentioned above in the actual application of high-nickel cathode materials.

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 for high-nickel positive electrode material lithium ion battery
  • Electrolyte for high-nickel positive electrode material lithium ion battery
  • Electrolyte for high-nickel positive electrode material lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A kind of electrolytic solution for high-nickel cathode material lithium ion battery, preparation is as follows:

[0036] Configure the carbonate-based organic solvent according to the mass ratio EC:EMC=3:7 (mass ratio). Dissolve the lithium salt lithium hexafluorophosphate in the above-mentioned organic solvent, wherein the mass of the organic solvent is 85 wt.% of the total mass, the mass of the lithium salt accounts for 13 wt.% of the total weight of the electrolyte, and 2.0 wt.% benzoic anhydride is added to the above In the electrolyte solution, it is dissolved to obtain the lithium ion battery electrolyte solution.

[0037] A lithium-ion battery was assembled using the electrolyte solution prepared above and the positive electrode material NCM811.

Embodiment 2

[0039] The difference from Example 1 is that 2.0 wt.% benzoic anhydride and 0.5 wt.% lithium difluorooxalate phosphate are added as two-component additives to the electrolyte.

Embodiment 3

[0041] The difference from Example 1 is that 1.0 wt.% benzoic anhydride and 0.5 wt.% lithium difluorooxalate phosphate are added as two-component additives to the electrolyte.

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 discloses an electrolyte of a high-nickel positive electrode material lithium ion battery. The electrolyte contains an anhydride additive. Meanwhile, the additive improves the performance of the battery together with an auxiliary additive. The additive can form a passivation film on the surface of the battery positive electrode material through oxidation, the passivation film is in close contact with the surface of a high-nickel positive electrode material, direct contact between electrolyte and the surface of the positive electrode material is avoided, and oxidative decomposition and side reaction of the electrolyte are inhibited. The passivation film on the surface of the positive electrode can effectively inhibit dissolution of transition metal ions and improve the structural stability of the positive electrode material. Meanwhile, the additive can react with trace water and hydrofluoric acid in the electrolyte to eliminate hydrofluoric acid in the electrolyte and stabilize lithium hexafluorophosphate, so that the high-nickel lithium ion battery containing the electrolyte has a better capacity retention ratio.

Description

technical field [0001] The invention relates to a lithium-ion battery electrolyte and its application in a lithium-ion battery containing a high-nickel positive electrode material, belonging to the field of lithium-ion batteries. Background technique [0002] Lithium-ion batteries are widely used in portable electronic products, electric vehicles and other fields. In order to meet people's increasing demand for energy density, people are committed to developing high-energy-density cathode materials and improving the working voltage of lithium-ion batteries. For example, the operating voltage of high-voltage cathode material lithium nickel manganese oxide is as high as 4.9 V, but the energy density is low and the oxidation decomposition phenomenon is serious in a high-voltage environment; layered ternary materials with high energy density, such as high-nickel cathode material nickel-cobalt manganate Lithium (LiNi x co y mn z o 2 , x≥0.5) The discharge specific capacity c...

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): H01M10/0567H01M10/0525
CPCH01M10/0525H01M10/0567H01M2300/0025Y02E60/10
Inventor 高云芳姜森徐新
Owner ZHEJIANG UNIV OF TECH