Lithium-ion electrolyte with wide temperature range

An electrolyte and lithium-ion technology, which is applied in the field of electrolyte preparation for lithium-ion batteries, can solve problems such as poor performance of the electrolyte and difficulty in satisfying the stability of the electrolyte, and achieve widening of the use temperature range, good high-temperature performance, and high conductivity rate effect

Inactive Publication Date: 2019-11-15
HUARUI XINXIANG CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the electrolyte is difficult to meet the stability of the electrolyte under high temperature conditions.
[0004] The application number is CN201710289678.X, and the invention patent with the application publication date of 2017.04.27 discloses a high-temperature type electrolyte. Stability, maintaining the structure of the positive electrode, thereby improving battery life, but the electrolyte has poor performance under low temperature conditions

Method used

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  • Lithium-ion electrolyte with wide temperature range
  • Lithium-ion electrolyte with wide temperature range
  • Lithium-ion electrolyte with wide temperature range

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A wide temperature range lithium-ion electrolyte, the electrolyte is composed of 10wt% electrolyte lithium salt, 1wt% positive electrode film-forming additive (TMSB), 1 wt% negative electrode film-forming additive (VC) and the rest of the solvent ;

[0033] The electrolyte lithium salt is composed of lithium hexafluorophosphate, lithium difluorophosphate, and lithium bistrifluoromethanesulfonylimide in a mass ratio of 8:1:1;

[0034] The solvent is a mixture of organic carbonate and cyclic ether (1,4-dioxane) at a volume ratio of 1:1, and the composition of the organic carbonate is a mixture of EC, DEC and EMC at a volume ratio of 3:3:4.

Embodiment 2

[0036] A wide temperature range lithium-ion electrolyte, the electrolyte is composed of 10wt% electrolyte lithium salt, 1wt% positive electrode film-forming additive (TMSB), 1 wt% negative electrode film-forming additive (VC) and the rest of the solvent ;

[0037] The electrolyte lithium salt is composed of lithium hexafluorophosphate, lithium difluorophosphate, and lithium bistrifluoromethanesulfonylimide in a mass ratio of 8:1:1;

[0038] The solvent is a mixture of organic carbonate and carboxylate (EP) at a volume ratio of 1:1, and the composition of the organic carbonate is a mixture of EC, DEC and EMC at a volume ratio of 3:3:4.

Embodiment 3

[0040] A wide temperature range lithium-ion electrolyte, which consists of 15 wt % electrolyte lithium salt, 3 wt % positive film-forming additive (ADN), 3 wt % negative film-forming additive (FEC) and the balance of Solvent composition;

[0041] The electrolyte lithium salt is composed of lithium hexafluorophosphate, lithium difluorophosphate, and lithium bistrifluoromethanesulfonylimide in a mass ratio of 8:1:1;

[0042] The solvent is a mixture of organic carbonate and cyclic ether (1,3-dioxane) at a volume ratio of 1:1, and the composition of the organic carbonate is a mixture of EC, PC and DMC at a volume ratio of 2:1:7.

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Abstract

The invention belongs to the technical field of lithium-ion battery electrolyte preparation, in particular to a lithium-ion electrolyte with a wide temperature range. The electrolyte is composed of 10-20wt% of electrolyte lithium salt, 2-8wt% of additive and residual solvent. By using the electrolyte lithium salt capable of improving the high temperature performance and the solvent with a wide liquid path temperature range and combining the raw materials at a certain amount, the electrolyte has both good high temperature performance and good low temperature discharge performance, and finally,the use temperature range of the electrolyte is widened.

Description

technical field [0001] The invention belongs to the technical field of lithium ion battery electrolyte preparation, and in particular relates to a wide temperature range type lithium ion electrolyte. Background technique [0002] Since lithium-ion batteries entered the field of small electronics in 1990, after more than 20 years of research and practice, they have entered a stage of rapid development. With the continuous expansion of the lithium-ion battery market, it is difficult for traditional lithium-ion batteries to meet high and low temperature performance at the same time. Low temperature performance is difficult to meet the needs of the market. Therefore, developing an electrolyte that satisfies both high and low temperature performance has become an important direction for researchers. [0003] The invention patent whose application publication number is CN107171023A and whose application publication date is 2017.09.15 discloses a low-temperature electrolyte. The...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0568H01M10/0569H01M10/0525
CPCH01M10/0525H01M10/0567H01M10/0568H01M10/0569H01M2300/0025Y02E60/10
Inventor 王兰吕秀夯
Owner HUARUI XINXIANG CHEM
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