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Electrolyte and lithium-ion battery

A technology of electrolyte and electrolyte, applied in secondary batteries, circuits, electrical components, etc., can solve the problems of easy decomposition of cyclic sulfate esters, achieve the effects of inhibiting surface activity, good stability, and reducing resistance

Inactive Publication Date: 2021-06-25
湛江市金灿灿科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] Lithium-ion battery electrolytes generally obtain good high and low temperature performance by adding cyclic sulfate additives. However, cyclic sulfates are easy to decompose at room temperature, so the electrolyte containing cyclic sulfate additives must be kept at low temperature. Store and transport at room temperature
At the same time, the shelf life of the electrolyte is less than 6 months, which brings a lot of inconvenience to users

Method used

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  • Electrolyte and lithium-ion battery
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  • Electrolyte and lithium-ion battery

Examples

Experimental program
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Effect test

Embodiment 1

[0037] In the first step, at room temperature, in a nitrogen glove box with moisture less than 5ppm, ethylene carbonate (EC), propylene carbonate (PC), diethyl carbonate (DEC) and propyl acetate (PA) are mixed with mass ratio 3:1:4:2 are mixed to obtain the first mixed solution;

[0038] In the second step, add 1mol / L lithium hexafluorophosphate (LiPF 6 ), 0.1mol / L lithium bisfluorosulfonyl imide (LiFSI), 0.1mol / L lithium tetrafluorooxalate phosphate (LiPF 4 C 2 o 4 ), mix uniformly so that the molar concentration of lithium hexafluorophosphate in the electrolyte is 1mol / L, and the molar concentrations of lithium bisfluorosulfonimide and lithium tetrafluorooxalate phosphate in the electrolyte are 0.1mol / L, and the first Two mixed solution;

[0039] In the third step, adding 3% of 1,3-propane sultone (PS), 2% of succinonitrile (SN), and 1% of adiponitrile to the above-mentioned second mixed solution accounted for the total mass percentage of the electrolyte. Nitrile (ADN),...

Embodiment 2

[0050] In the first step, at room temperature, in a nitrogen glove box with moisture less than 5ppm, ethylene carbonate (EC), propylene carbonate (PC), diethyl carbonate (DEC), ethyl propionate (EP) and acetic acid Propyl ester (PA) is mixed with a mass ratio of 3:1:4:1:1 to obtain the first mixed solution;

[0051] Other steps are identical with embodiment 1.

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Abstract

The invention provides an electrolytic solution, comprising a non-aqueous organic solvent, an electrolyte lithium salt, and a first additive, the electrolyte lithium salt comprising lithium hexafluorophosphate, lithium bisfluorosulfonyl imide and lithium tetrafluorooxalate phosphate, and the first additive comprising Fluorinated anhydrides, lithium difluorooxalate borate and phosphates. The present invention also provides a lithium-ion battery comprising the above-mentioned electrolyte solution. The electrolyte solution of the invention has excellent high and low temperature performance, and can be stored and transported at room temperature.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to an electrolyte and a lithium ion battery using the electrolyte. Background technique [0002] Lithium-ion battery electrolytes generally obtain good high and low temperature performance by adding cyclic sulfate additives. However, cyclic sulfates are easy to decompose at room temperature, so the electrolyte containing cyclic sulfate additives must be kept at low temperature. Store and transport at room temperature. At the same time, the shelf life of the electrolyte is less than 6 months, which brings a lot of inconvenience to users. Contents of the invention [0003] The main purpose of the present invention is to provide an electrolyte solution, which can be stored at room temperature while ensuring better high and low temperature performance of the electrolyte solution. [0004] In order to achieve the above object, the electrolyte solution provided by the pr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0566H01M10/0567H01M10/0568H01M10/0525
CPCH01M10/0525H01M10/0566H01M10/0567H01M10/0568Y02E60/10
Inventor 高歌谢青松杨文峰杨宁江
Owner 湛江市金灿灿科技有限公司
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