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Lithium ion battery electrolyte and preparation method thereof

A lithium-ion battery and electrolyte technology, applied in the field of lithium-ion batteries, can solve the problems of low capacity retention rate, low-temperature charging lithium evolution, poor low-temperature performance, etc. Effect

Pending Publication Date: 2022-02-11
江苏涛立电子新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As we all know, ordinary lithium-ion batteries have poor low-temperature performance, cannot be charged under extremely cold conditions (below -40°C), and are prone to low-temperature charging and lithium deposition, and the capacity retention rate is very low under high-rate discharge conditions.

Method used

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  • Lithium ion battery electrolyte and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Step 1. Take dimethyl carbonate: ethyl methyl carbonate: propylene carbonate: ethylene carbonate mass ratio of 2:11:2:1 organic solvents and mix them evenly to obtain a mixed solvent, set aside; take ethyl acetate: glycerin Ester: bismorpholino diethyl ether: tris(2,2,2-trifluoroethyl) phosphate: propenyl-1,3-sultone: ethoxy pentafluorocyclotriphosphazene mass ratio Each additive is 2:3:0.2:0.5:1:1, for standby; the mass ratio of the total amount of additives to the total amount of organic solvent is 1:90;

[0028] Step 2. Stir and mix ethyl acetate and glyceride at -10°C to obtain a mixture for later use;

[0029] Step 3. Take half of the mixed solvent, add lithium tetrafluoroborate and lithium dioxalate borate at the same time, stir and mix evenly, then add the mixture in step 2, stir and mix evenly to obtain the first mixed solution;

[0030] Step 4. Take the other half of the mixed solvent, add ethoxypentafluorocyclotriphosphazene while stirring, mix well and heat ...

Embodiment 2

[0036] Step 1, take dimethyl carbonate: ethyl methyl carbonate: propylene carbonate: ethylene carbonate mass ratio of 3:7:1:2 organic solvents and mix them evenly to obtain a mixed solvent, set aside; take ethyl acetate: glycerin Ester: bismorpholino diethyl ether: tris(2,2,2-trifluoroethyl) phosphate: propenyl-1,3-sultone: ethoxy pentafluorocyclotriphosphazene mass ratio Each additive is 1:4:0.1:1:2:0.5, and it is reserved; the mass ratio of the total amount of additives to the total amount of organic solvent is 2:85;

[0037] Step 2. Stir and mix ethyl acetate and glyceride at -5°C to obtain a mixture for later use;

[0038] Step 3. Take half of the mixed solvent, add lithium tetrafluoroborate and lithium dioxalate borate at the same time, stir and mix evenly, then add the mixture in step 2, stir and mix evenly to obtain the first mixed solution;

[0039] Step 4. Take the other half of the mixed solvent, add ethoxypentafluorocyclotriphosphazene while stirring, mix well and ...

Embodiment 3

[0045] Step 1, take dimethyl carbonate: ethyl methyl carbonate: propylene carbonate: ethylene carbonate mass ratio of 4:3:2:1 of organic solvents and mix them evenly to obtain a mixed solvent, set aside; take ethyl acetate: glycerin Ester: bismorpholino diethyl ether: tris(2,2,2-trifluoroethyl) phosphate: propenyl-1,3-sultone: ethoxy pentafluorocyclotriphosphazene mass ratio Each additive is 3:2:0.3:2:1.5:1, for standby; wherein the mass ratio of the total amount of additives to the total amount of organic solvent is 4:75;

[0046] Step 2. Stir and mix ethyl acetate and glyceride at -20°C to obtain a mixture for later use;

[0047] Step 3. Take half of the mixed solvent, add lithium tetrafluoroborate and lithium dioxalate borate at the same time, stir and mix evenly, then add the mixture in step 2, stir and mix evenly to obtain the first mixed solution;

[0048] Step 4. Take the other half of the mixed solvent, add ethoxypentafluorocyclotriphosphazene while stirring, mix well...

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Abstract

The invention discloses a lithium ion battery electrolyte, which comprises an electrolyte lithium salt, an organic solvent and an additive, the electrolyte lithium salt comprises lithium tetrafluoroborate, lithium bis (oxalato) borate and lithium bis (trifluoromethanesulfonimide); the organic solvent comprises dimethyl carbonate, methyl ethyl carbonate, propylene carbonate and ethylene carbonate; and the additive is prepared from the following components: ethyl acetate, glyceride, dimorpholinyl diethyl ether, tris (2, 2, 2-trifluoroethyl) phosphate ester, allyl-1, 3-sultone and ethoxypentafluorocyclotriphosphazene. The electrolyte is wide in working temperature range and good in high-rate cycle performance.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a lithium ion battery electrolyte and a preparation method thereof. Background technique [0002] Most of the current starting batteries for automobiles are lead-acid batteries, but lead-acid batteries have low specific energy and serious lead pollution problems, and their service life is about 2 to 3 years. Using lithium-ion batteries instead of lead-acid batteries as automobile starting batteries has less environmental pollution, higher power density and cycle life. As we all know, ordinary lithium-ion batteries have poor low-temperature performance, cannot be charged under extremely cold conditions (below -40°C), and are prone to lithium deposition at low temperature, and the capacity retention rate is very low under high-rate discharge conditions. The performance of the electrolyte is an important factor affecting the low-temperature performance of lithium-ion ...

Claims

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Application Information

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IPC IPC(8): H01M10/0569H01M10/0568H01M10/0567H01M10/0525H01M10/42
CPCH01M10/0569H01M10/0568H01M10/0567H01M10/0525H01M10/4235H01M2300/0025Y02E60/10
Inventor 谢海龙刘乐明沈阳贺彩香
Owner 江苏涛立电子新材料有限公司
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