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A kind of lithium ion battery electrolyte, lithium ion battery

A lithium-ion battery and electrolyte technology, applied in secondary batteries, circuits, electrical components, etc., can solve problems such as poor low-temperature performance, poor work performance, and inhibition of application, and achieve the effect of improving stability and high-temperature performance

Active Publication Date: 2020-04-10
CALB CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The hydrophobic electrolyte of lithium-ion batteries is mainly formed by dissolving electrolyte salts in organic solvents. The conductivity of conventional electrolytes is average. When high requirements are placed on the low-temperature performance of batteries, conventional electrolytes cannot optimize the function of battery materials. Therefore, its low-temperature performance is poor, and the discharge performance of lithium batteries at -40°C is even worse or cannot discharge power.
This makes the low-temperature performance of current lithium-ion batteries, especially in ultra-low temperature environments, poor, which seriously inhibits their application in these special fields.
[0004] The Chinese invention patent with the publication number CN103825049B discloses a high-temperature-resistant electrolyte solution for lithium-ion batteries, in which the high-temperature-resistant additive lithium oxalate borate is added, accounting for 0.1%-8% of the total mass of the electrolyte solution. Ion batteries have good performance at high temperatures, and the 200-cycle cycle capacity at 60°C is about 70%, but the low temperature resistance of the electrolyte is average, which cannot meet the needs of batteries at low temperatures

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The lithium-ion battery electrolyte additive in the present embodiment is made up of ethylene carbonate, vinyl sulfate, three (trimethylsilane) borates, and described ethylene carbonate, vinyl sulfate, three (trimethylsilane) boron The mass ratio of esters is 3:8:5.

[0021] The electrolyte solution in this embodiment includes: the above-mentioned additives, solvent and electrolyte salt, and the solvent is composed of propylene carbonate, dimethyl carbonate, ethyl methyl carbonate, Composed of diethyl carbonate; the electrolyte salt is lithium hexafluorophosphate and lithium bisfluorosulfonyl imide, the molar ratio of which is =8:2, LiPF 6 The concentration is 1.0 mol / L; the addition amount of the ethylene carbonate, vinyl sulfate, and tris(trimethylsilane) borate is 0.3%, 0.8%, and 0.5% of the mass of the electrolyte, respectively.

[0022] The lithium-ion battery in this example is made from the above-mentioned electrolyte, wherein the positive electrode sheet of the...

Embodiment 2

[0024] The lithium-ion battery electrolyte additive in the present embodiment is made up of ethylene carbonate, vinyl sulfate, three (trimethylsilane) borates, and described ethylene carbonate, vinyl sulfate, three (trimethylsilane) boron The mass ratio of esters is 5:10:1.

[0025] The electrolyte solution in this embodiment includes: the above-mentioned additives, solvent and electrolyte salt, and the solvent is composed of propylene carbonate, dimethyl carbonate, ethyl methyl carbonate, Composed of diethyl carbonate; the electrolyte salt is lithium hexafluorophosphate and lithium bisfluorosulfonyl imide, the molar ratio of which is =10:1, LiPF 6 The concentration is 1.1 mol / L; the addition amount of the ethylene carbonate, vinyl sulfate, and tris(trimethylsilane) borate is 0.5%, 1.0%, and 0.1% of the mass of the electrolyte, respectively.

[0026] The lithium-ion battery in this embodiment is made from the above-mentioned electrolyte solution. The preparation of positive ...

Embodiment 3

[0028] The lithium-ion battery electrolyte additive in the present embodiment is made up of ethylene carbonate, vinyl sulfate, three (trimethylsilane) borates, and described ethylene carbonate, vinyl sulfate, three (trimethylsilane) boron The mass ratio of esters is 2:10:2.

[0029] The electrolyte solution in this embodiment includes: the above-mentioned additives, solvent and electrolyte salt, and the solvent is composed of propylene carbonate, dimethyl carbonate, ethyl methyl carbonate, Composed of diethyl carbonate; the electrolyte salt is lithium hexafluorophosphate and lithium bisfluorosulfonimide, the molar ratio of which is =7:1.5, LiPF 6 The concentration is 1.2 mol / L; the addition amount of the ethylene carbonate, vinyl sulfate, and tris(trimethylsilane) borate is 0.2%, 1.0%, and 2.0% of the mass of the electrolyte, respectively.

[0030] The lithium-ion battery in this embodiment is made from the above-mentioned electrolyte solution. The preparation of positive an...

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PUM

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Abstract

The invention relates to a lithium ion battery electrolyte additive, an electrolyte and a lithium ion battery and belongs to the technical field of lithium ion batteries. The lithium ion battery additive uses components with good thermal stability and low film-forming resistance. Ethylene carbonate and ethylene sulfate can improve the conductivity of a lithium ion electrolyte at a low temperatureand an ultra-low temperature. Tri(trimethylsilane)borate can protect a positive pole and improve the high-temperature performances of the battery. A lithium ion battery prepared from the electrolyte containing the lithium ion battery electrolyte additive has performances at a low temperature and a high temperature, has the discharge capacity 85% of the initial capacity at a low temperature of -20DEG C, has the discharge capacity 75% of the initial capacity at a low temperature of -40 DEG C and keeps 85% of the capacity of the battery stored at a high temperature of 55 DEG C for 28d.

Description

technical field [0001] The invention relates to a lithium ion battery electrolyte and a lithium ion battery, belonging to the technical field of lithium ion batteries. Background technique [0002] Compared with other types of secondary batteries, lithium-ion batteries have the advantages of high voltage, high energy density, long service life, small self-discharge, and no memory effect. These advantages make lithium-ion batteries more and more widely used. Lithium-ion batteries have gradually become the protagonists in those occasions that require high battery electrical performance, reliability, and safety, such as aviation, aerospace, and military fields. [0003] The hydrophobic electrolyte of lithium-ion batteries is mainly formed by dissolving electrolyte salts in organic solvents. The conductivity of conventional electrolytes is average. When high requirements are placed on the low-temperature performance of batteries, conventional electrolytes cannot optimize the fun...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0567H01M10/0525
CPCH01M10/0525H01M10/0567Y02E60/10
Inventor 张要军杨超刘吉云
Owner CALB CO LTD