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Electrolyte containing phenyl sulfonate compound and lithium ion battery

A technology containing phenyl sulfonate and lithium-ion batteries, which can be used in secondary batteries, organic electrolytes, non-aqueous electrolytes, etc., and can solve the problems of effectively improving the high-temperature cycle performance of batteries

Active Publication Date: 2021-12-10
JIUJIANG TINCI ADVANCED MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the addition of the second additive did not effectively improve the high-temperature cycle performance of the battery.

Method used

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  • Electrolyte containing phenyl sulfonate compound and lithium ion battery
  • Electrolyte containing phenyl sulfonate compound and lithium ion battery
  • Electrolyte containing phenyl sulfonate compound and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (1) Electrolyte composition:

[0033] The structural formula of the electrolyte first additive in the present embodiment is as formula (I 1 ) shown.

[0034]

[0035] Formula (I 1) compound is prepared by adding phenol, toluene and triethylamine into the reactor at room temperature under a nitrogen atmosphere, and then adding sulfonyl fluoride into the reactor at 0°C to 10°C. The reaction temperature is adjusted to 40° C. to 50° C.; the reaction time is 1 h to 4 h. Wherein the ratio of sulfonyl fluoride to phenol is 1:1. The ratio of the amount of substance of sulfonyl fluoride to the amount of substance of triethylamine was 1:1.

[0036] In the present embodiment, formula (I 1 ) represents 1% of the weight of the electrolytic solution; the second additive is citraconic anhydride, which accounts for 0.5% of the weight of the electrolytic solution; the lithium salt is lithium hexafluorophosphate, and the lithium salt accounts for 13% of the weight of the electrol...

Embodiment 2

[0040] (1) Electrolyte composition:

[0041] The structural formula of the electrolyte first additive in the present embodiment is as formula (I 2 ) shown.

[0042]

[0043] Formula (I 2 ) compound is prepared by adding hydroquinone, toluene and triethylamine into the reaction kettle at room temperature under nitrogen protection atmosphere, and then adding sulfonyl fluoride into the reaction kettle at 0°C to 10°C. The reaction temperature is adjusted to 40° C. to 50° C.; the reaction time is 1 h to 4 h. Wherein the ratio of sulfonyl fluoride to hydroquinone is 2:1. The ratio of the amount of substance of sulfonyl fluoride to the amount of substance of triethylamine was 1:1.

[0044] In the present embodiment, formula (I 2 ) represents 1% of the weight of the electrolytic solution; the second additive is citraconic anhydride, which accounts for 0.5% of the weight of the electrolytic solution; the lithium salt is lithium hexafluorophosphate, and the lithium salt accounts...

Embodiment 3

[0048] (1) Electrolyte composition:

[0049] The structural formula of the electrolyte first additive in the present embodiment is as formula (I 3 ) shown.

[0050]

[0051] In the present embodiment, formula (I 3 ) represents 1% of the weight of the electrolytic solution; the second additive is citraconic anhydride, which accounts for 0.5% of the weight of the electrolytic solution; the lithium salt is lithium hexafluorophosphate, and the lithium salt accounts for 13% of the weight of the electrolytic solution; the solvent It is a solvent mixed with ethylene carbonate and ethyl methyl carbonate at a weight ratio of 1:2; the electrolyte solution of this example was prepared according to the conventional electrolyte preparation method.

[0052] (2) Assemble the lithium-ion battery:

[0053] The cathode material is LiNi 0.8 co 0.1 mn 0.1 o 2 ; The negative electrode material is artificial graphite; the diaphragm is polyethylene film; the electrolyte is the electrolyte ...

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Abstract

The invention belongs to the technical field of lithium ion battery materials, and discloses an electrolyte containing a phenyl sulfonate compound and a lithium ion battery. The electrolyte comprises a first additive with a structure shown in a formula (I) and a second additive with an unsaturated bond. The first additive can effectively inhibit and reduce the battery impedance, especially the low-temperature impedance, and further improve the high and low temperature performance of the battery. And the first additive is stable in overall structure and does not need to be stored at low temperature, and an electrolyte using the compound additive does not need to be stored at low temperature, so that the stability of the electrolyte is superior to that of a DTD-containing electrolyte. And the second additive containing unsaturated bonds is matched for use, so that the electrochemical performance, especially the cycle performance, of the battery under high voltage can be further enhanced.

Description

technical field [0001] The invention belongs to the technical field of lithium ion battery materials, and in particular relates to an electrolyte solution containing phenyl sulfonate compound and a lithium ion battery. Background technique [0002] At present, the most commonly used additives in electrolytes on the market are 1,3-propane sultone (PS), fluoroethylene carbonate (FEC), ethylene sulfate (DTD), etc. Among them, DTD has a wide range of applications, almost Can be used with all lithium-ion batteries. Now low DCIR (DC internal resistance) has become a key indicator for more and more battery factory customers, so electrolytes that can reduce battery DCIR have become their new needs. There are not many additives on the market that can reduce battery DCIR and take into account high and low temperature performance, and DTD is one of them. Because DTD itself is unstable and easy to decompose at high temperature, it will further aggravate the deterioration of the electr...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0525H01M10/42
CPCH01M10/0567H01M10/0525H01M10/4235H01M2300/0025Y02E60/10
Inventor 曹哥尽范伟贞信勇赵经纬
Owner JIUJIANG TINCI ADVANCED MATERIALS CO LTD
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