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Additive, electrolyte and application thereof in improving low-temperature performance of lithium battery

A technology of electrolyte and lithium battery, applied in the application field of additives to improve the low-temperature performance of lithium batteries, to achieve the effects of good conductivity, excellent low-temperature performance, and excellent composition

Pending Publication Date: 2022-03-08
DALIAN CBAK POWER BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its disadvantage is that the pyridines cannot form an effective SEI film on the negative electrode, and in actual use, additional additives such as VC, FEC, TSVC, PS, etc. must be added to form a film on the negative electrode.

Method used

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  • Additive, electrolyte and application thereof in improving low-temperature performance of lithium battery

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] This embodiment provides an additive for an electrolyte, which contains methylene methanedisulfonate, ethylene carbonate, and allylmalonylurea in a mass ratio of 1:1:1.

[0041] This embodiment further provides a lithium battery electrolyte containing the above additives, the formula of which is as follows: 15.6g lithium hexafluorophosphate, 0.5g methylene methanedisulfonate, 0.5g ethylene carbonate, 0.5g allyl malonyl urea , 82.9g organic solvent (ethylene carbonate 12.435g, ethyl methyl carbonate 14.922g, propyl propionate 55.543g, the mass percentage of the three is 15:18:67).

[0042] During preparation, lithium hexafluorophosphate, methylene methanedisulfonate, ethylene carbonate, and allyl malonyl urea are dissolved in an organic solvent and mixed uniformly to prepare an electrolyte solution.

Embodiment 2

[0044] This embodiment provides an additive for electrolyte, which contains lithium difluorooxalate borate, ethylene carbonate and 2-oxomalonylurea in a mass ratio of 5:5:8.

[0045] This embodiment further provides a lithium battery electrolyte containing the above-mentioned additives, the formula of which is as follows: 20g lithium hexafluorophosphate, 0.5g lithium difluorooxalate borate, 0.5g ethylene carbonate, 0.8g 2-oxomalonylurea, 78.2g Organic solvent (ethylene carbonate 15.640g, ethyl methyl carbonate 15.640g, ethyl propionate 46.920g, the mass percentage of the three is 20:20:60).

[0046] During preparation, lithium hexafluorophosphate, lithium difluorooxalate borate, ethylene carbonate, and 2-oxomalonylurea are dissolved in an organic solvent and mixed uniformly to prepare an electrolyte solution.

Embodiment 3

[0048] This embodiment provides an additive for electrolyte, which contains lithium difluorooxalate borate, ethylene carbonate and oxalylurea in a mass ratio of 1:1:2.

[0049] This embodiment further provides a lithium battery electrolyte containing the above-mentioned additives, the formula of which is as follows: 18.0g lithium hexafluorophosphate, 0.5g lithium difluorooxalate borate, 0.5g ethylene carbonate, 1.0g oxalyl urea, 80g organic solvent (carbonic acid Vinyl ester 12.800g, dimethyl carbonate 15.200g, propyl propionate 52.000g, the mass percentage of the three is 16:19:65).

[0050] During preparation, lithium hexafluorophosphate, lithium difluorooxalate borate, ethylene carbonate, and oxalylurea are dissolved in an organic solvent and mixed uniformly to prepare an electrolyte solution.

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Abstract

The invention relates to the field of batteries, in particular to an additive, an electrolyte and application thereof in improving the low-temperature performance of a lithium battery. The additive for the electrolyte provided by the invention can be prior to an electrolyte solvent, a thin and continuous SEI film is formed in the lithium battery, and compared with an SEI film formed by a traditional electrolyte, the film has the advantages that the impedance of main components is lower, and the conductivity is better, so that the lithium battery applying the additive or the electrolyte has excellent low-temperature performance.

Description

technical field [0001] The invention relates to the field of batteries, in particular to an additive, an electrolyte solution and their application in improving the low-temperature performance of lithium batteries. Background technique [0002] In the 21st century, lithium batteries are widely used in many fields such as mobile phones, computers, wearable devices, electric vehicles, two-wheeled bicycles, power tools, and street lamps. [0003] In recent years, as lithium batteries have become more and more widely used in various fields, the requirements for battery performance and application environment have become higher and higher, such as high-power discharge, ultra-low temperature discharge below -30°C, and ultra-long cycle life of 10,000 times. Wait. Especially in the field of low temperature, the demand is becoming more and more vigorous. However, under low temperature conditions, first, as the temperature decreases, the discharge of lithium batteries becomes more an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/42H01M10/0525
CPCH01M10/0567H01M10/4235H01M10/0525H01M2300/0025Y02E60/10
Inventor 王元杰薄晋科田秀君王文武曹仕良
Owner DALIAN CBAK POWER BATTERY CO LTD
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