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Low-temperature battery electrolytic solution based on ionic liquid, preparation method and application thereof

An ionic liquid, low-temperature lithium battery technology, applied in the field of lithium-ion battery electrolyte materials, can solve the problems of unfavorable battery capacity, high cost, high low-temperature viscosity of ionic liquid, etc. Effect

Pending Publication Date: 2021-06-11
苏州德加能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, ionic liquids have the problems of high viscosity at low temperature and high cost, which will not be conducive to the development of battery capacity.

Method used

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  • Low-temperature battery electrolytic solution based on ionic liquid, preparation method and application thereof
  • Low-temperature battery electrolytic solution based on ionic liquid, preparation method and application thereof
  • Low-temperature battery electrolytic solution based on ionic liquid, preparation method and application thereof

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Effect test

Embodiment 1

[0027] This embodiment provides a low-temperature lithium battery electrolyte based on ionic liquid and its preparation method, specifically:

[0028] (a) Under argon protection, measure 1.0 mL of 1-ethyl-3-methylimidazole bistrifluoromethanesulfonimide ionic liquid in a glove box, and then weigh 0.374 g of bis(fluorosulfonyl Acyl) imide lithium (LiFSA), stir evenly, the amount concentration of LiFSA in this ionic liquid electrolyte is 2.0M;

[0029] (b) Add 1.0 mL of anhydrous dichloromethane to the above electrolytic solution; after fully mixing, the low-temperature electrolytic solution is obtained; the lithium salt concentration in the electrolytic solution is 1.0M.

Embodiment 2

[0031] This embodiment provides an ionic liquid-based low-temperature lithium battery electrolyte and its configuration method, specifically:

[0032] (a) Under argon protection, measure 1.0 mL of N-butyl-N-methylpyrrolidine bistrifluoromethanesulfonimide salt ionic liquid in a glove box, and then weigh 0.574 g of bistrifluoromethanesulfonimide ionic liquid Lithium methanesulfonylimide (LiTFSI), stirred evenly, the concentration of LiTFSI in the ionic liquid electrolyte is 2.0M;

[0033] (b) Add 4.0 mL of anhydrous dichloromethane to the above electrolytic solution; after fully mixing, the low-temperature electrolytic solution is obtained; the lithium salt concentration in the electrolytic solution is 0.4M.

Embodiment 3

[0035] This embodiment provides an ionic liquid-based low-temperature lithium battery electrolyte and its configuration method, specifically:

[0036] (a) Under argon protection, measure 1.0 mL of N-butyl-N-methylpyrrolidine bistrifluoromethanesulfonimide salt ionic liquid in a glove box, and then weigh 0.152 g of lithium hexafluorophosphate ( LiPF 6 ) mixed evenly, the LiPF in the ionic liquid electrolyte 6 The concentration of the substance is 1.0M;

[0037] (b) After mixing evenly, add 1.0mL of 1,1,2,2-tetrafluoroethyl-2,2,2-trifluoroethyl ether to the above electrolytic solution; low-temperature electrolyte; in this electrolyte, the lithium salt concentration is 0.5M.

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Abstract

The invention provides a low-temperature battery electrolytic solution based on an ionic liquid, a preparation method and application thereof. The electrolytic solution comprises an organic solvent, a lithium salt and an ionic liquid, wherein the ionic liquid is an imidazolium ionic liquid, a pyrrolyl ionic liquid or a pyridyl ionic liquid. The invention also provides a preparation method of the electrolytic solution. According to the invention, the low-temperature capacity retention rate and the cycle performance of the lithium ion battery containing the electrolytic solution are greatly improved.

Description

technical field [0001] The invention relates to a low-temperature lithium battery electrolyte, in particular to an ionic liquid-based low-temperature resistant lithium battery electrolyte and a preparation method thereof, belonging to the technical field of lithium-ion battery electrolyte materials. Background technique [0002] In recent decades, due to the significant reduction in cost of Li-ion batteries, their applications in different fields have been increasing. In particular, the number of electric vehicles has increased exponentially, while more than 60% of lithium-ion batteries have been deployed in transportation electrification applications. Therefore, society is paying more and more attention to high-energy lithium batteries that are safe and can operate in a wide operating temperature range. At present, the operating temperature of most commercial batteries is around room temperature, and with the popularization of electrification, the demand for low-temperatur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0566H01M10/0569H01M10/0525
CPCH01M10/0566H01M10/0569H01M10/0525H01M2300/0028Y02E60/10
Inventor 晏成林郑艺伟钱涛夏欣瑶朱元泽
Owner 苏州德加能源科技有限公司
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