Overcharge-resistant electrolyte, secondary lithium battery adopting electrolyte and preparation method

An electrolyte and overcharge technology, applied in the manufacture of electrolyte batteries, secondary batteries, non-aqueous electrolyte batteries, etc., can solve the problems of loss of performance of overcharge additives, affecting the long cycle life of batteries, increasing battery internal resistance, etc. Room temperature cycle performance and high temperature performance, the effect of reducing reactivity and improving high and low temperature performance

Inactive Publication Date: 2020-04-21
GUANG DONG VDL NEW ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Currently commonly used anti-overcharge additives (such as biphenyl, cyclohexylbenzene) can improve the overcharge safety of the battery to a certain extent, but the stability is poor during the long cycle of the battery, and it is easy to increase the internal resistance of the battery and affect the battery life. At the same time, when the battery is overcharged, this type of additive will irreversibly decompose and produce gas or electropolymerization. After the battery is overcharged, the overcharge additive will often lose its own performance.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0023] Example 1

[0024] The mass percentage of the solvent in the electrolyte is 78%, and the mass ratio of ethylene carbonate, propylene carbonate and methyl ethyl carbonate in the solvent is 1:1:3. The mass percentage of the ionic liquid in the electrolyte is 3%. The mass percentage of the biphenyl in the electrolyte is 1%, and the mass percentage of the cyclohexylbenzene in the electrolyte is 1%. The mass percentage of the vinylene carbonate in the electrolyte is 0.5%, the mass percentage of the 1,3-propane sultone in the electrolyte is 0.5%, and the mass percentage of the vinyl sulfate in the electrolyte is 0.5%. The percentage is 0.5%. The mass percentage of the flame retardant additive in the electrolyte is 1%. The mass percentage of lithium bistrifluoromethanesulfonimide is 1%, the mass percentage of lithium bisoxalatoborate is 1%, and the balance is lithium hexafluorophosphate.

Example Embodiment

[0025] Example 2

[0026] The mass percentage of the solvent in the electrolyte is 76%, and the mass ratio of ethylene carbonate, propylene carbonate and methyl ethyl carbonate in the solvent is 1:1:3. The mass percentage of the ionic liquid in the electrolyte is 5%. The mass percentage of the biphenyl in the electrolyte is 2%, and the mass percentage of the cyclohexylbenzene in the electrolyte is 2%. The mass percentage of the vinylene carbonate in the electrolyte is 1%, the mass percentage of the 1,3-propane sultone in the electrolyte is 1%, and the mass percentage of the vinyl sulfate in the electrolyte is 1%. The percentage is 1%. The mass percentage of the flame retardant additive in the electrolyte is 0.5%. The mass percentage of lithium bistrifluoromethanesulfonimide is 1%, the mass percentage of lithium bisoxalatoborate is 1%, and the balance is lithium hexafluorophosphate.

Example Embodiment

[0027] Example 3

[0028] The mass percentage of the solvent in the electrolyte is 73%, and the mass ratio of ethylene carbonate, propylene carbonate and methyl ethyl carbonate in the solvent is 1:1:3. The mass percentage of the ionic liquid in the electrolyte is 8%. The mass percentage of the biphenyl in the electrolyte is 1%, and the mass percentage of the cyclohexylbenzene in the electrolyte is 1%. The mass percentage of the vinylene carbonate in the electrolyte is 1%, the mass percentage of the 1,3-propane sultone in the electrolyte is 1.5%, and the mass percentage of the vinyl sulfate in the electrolyte is 1.5%. The percentage is 1.5%. The mass percentage of the flame retardant additive in the electrolyte is 1.5%. The mass percentage of lithium bistrifluoromethanesulfonimide is 1%, the mass percentage of lithium bisoxalatoborate is 1%, and the balance is lithium hexafluorophosphate.

[0029] The preparation method of this electrolyte is:

[0030] 1) In a glove box fille

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Abstract

The invention provides an overcharge-resistant electrolyte and a preparation method thereof. The electrolyte comprises lithium salt, a solvent, an ionic liquid, an anti-overcharge additive, a film-forming additive and a flame-retardant additive, wherein the lithium salt consists of lithium hexafluorophosphate, ditrifluoromethyl lithium sulfonimide and lithium bis(oxalato) borate; the solvent consists of ethylene carbonate, propylene carbonate and ethyl methyl carbonate; the ionic liquid is N-methyl-N-PROPYLPIPERIDIUM bis (trifluoromethane sulfonyl) imide, and the anti-overcharge additive is composed of biphenyl and phenylcyclohexane; the film-forming additive is composed of vinylene carbonate, 1, 3-propane sultone and ethylene sulfate; and the flame-retardant additive is triphenyl phosphate. According to the overcharge-resistant electrolyte, a secondary lithium battery has relatively high safety and electrochemical performance, and long circulation and overcharge prevention performanceis realized.

Description

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Claims

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Application Information

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Owner GUANG DONG VDL NEW ENERGY CO LTD
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