A kind of anti-overcharge safe electrolyte for lithium battery

An anti-overcharge and electrolyte technology, applied in secondary batteries, organic electrolytes, non-aqueous electrolytes, etc., to reduce negative effects, improve cycle performance, and reduce adverse effects

Active Publication Date: 2021-01-26
SHUANGDENG GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide an anti-overcharge safe electrolyte, which can not only solve the problem of anti-overcharge safety of lithium batteries, but also reduce the adverse effects of additives on battery cycle performance, and prevent the polymer film formed by additives from covering the positive electrode. , reducing the difficulty of recycling cathode materials

Method used

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  • A kind of anti-overcharge safe electrolyte for lithium battery
  • A kind of anti-overcharge safe electrolyte for lithium battery
  • A kind of anti-overcharge safe electrolyte for lithium battery

Examples

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Effect test

Embodiment 1

[0028] An anti-overcharge safe electrolyte for lithium batteries, the safe electrolyte is composed of organic solvents, electrolytes, film-forming additives, flame retardant additives, and composite anti-overcharge additives in a mass ratio of 100:18:4:1:2 composition.

[0029]The preparation method of the composite anti-overcharge additive is to mix 2,7-dibromo-9-fluorenone and N-(2,4,6-trichlorophenyl)maleimide evenly in a mass ratio of 2.5:1, and heat To complete melting to obtain a mixed melt, then add porous nano-silica to the excess mixed melt, ultrasonically oscillate for 24 hours, then suction filter, cool, and grind to particles with a particle size of 50-100nm;

[0030] The organic solvent is a mixed solvent of ethylene carbonate / dimethyl carbonate (the volume ratio of ethylene carbonate to dimethyl carbonate is 1:1);

[0031] The electrolyte is lithium hexafluorophosphate;

[0032] The film-forming additive is composed of vinyl sulfite and N-methylpyrrole in a mas...

Embodiment 2

[0035] An anti-overcharge safe electrolyte for lithium batteries, the safe electrolyte is composed of organic solvents, electrolytes, film-forming additives, flame retardant additives, and composite anti-overcharge additives in a mass ratio of 100:17:5:3:2.5 composition.

[0036] The preparation method of the composite anti-overcharge additive is to mix 2,7-dibromo-9-fluorenone and N-(2,4,6-trichlorophenyl)maleimide evenly in a mass ratio of 2.8:1, and heat To complete melting to obtain a mixed melt, then add porous nano-silica to the excess mixed melt, ultrasonically oscillate for 24 hours, then suction filter, cool, and grind to particles with a particle size of 50-100nm;

[0037] The organic solvent is a mixed solvent of ethylene carbonate / ethyl methyl carbonate (the volume ratio of ethylene carbonate to ethyl methyl carbonate is 1:1);

[0038] The electrolyte is lithium hexafluorophosphate;

[0039] The film-forming additive is composed of vinyl sulfite and N-methylpyrro...

Embodiment 3

[0042] An anti-overcharge safe electrolyte for lithium batteries, the safe electrolyte is composed of organic solvents, electrolytes, film-forming additives, flame retardant additives, and composite anti-overcharge additives in a mass ratio of 100:17:4:2:3 composition.

[0043] The preparation method of the composite anti-overcharge additive is to mix 2,7-dibromo-9-fluorenone and N-(2,4,6-trichlorophenyl)maleimide evenly in a mass ratio of 2.2:1, and heat To complete melting to obtain a mixed melt, then add porous nano-silica to the excess mixed melt, ultrasonically oscillate for 12 hours, then suction filter, cool, and grind to particles with a particle size of 50-100nm;

[0044] The organic solvent is a mixed solvent of ethylene carbonate / diethyl carbonate (the volume ratio of ethylene carbonate and diethyl carbonate is 1:1);

[0045] The electrolyte is lithium hexafluorophosphate;

[0046] The film-forming additive is composed of vinyl sulfite and N-methylpyrrole in a mas...

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Abstract

The invention relates to the technical field of lithium battery electrolytes, and provides an overcharge-preventing safe electrolyte for lithium batteries. Described electrolytic solution comprises organic solvent, electrolyte, film-forming additive, flame retardant additive and composite anti-overcharge additive, and described composite anti-overcharge additive is 2,7-dibromo-9-fluorenone and N-(2, 4,6-trichlorophenyl)maleimide is jointly supported on porous nano-silica. The electrolyte solution provided by the invention uses additives with different anti-overcharge mechanisms in combination, which can reduce the amount of electropolymerization additives and reduce the adverse effects on battery cycle performance on the basis of solving the safety problem caused by overcharge. Moreover, the thin film generated by electropolymerization of N-(2,4,6-trichlorophenyl)maleimide covers the surface of the negative electrode, which does not affect the recycling of the positive electrode material.

Description

technical field [0001] The invention belongs to the technical field of lithium battery electrolytes and provides an overcharge-preventing safe electrolyte for lithium batteries. Background technique [0002] Lithium-ion batteries are used as power batteries in electric vehicles, electric bicycles, hybrid electric vehicles and other fields, and their safety issues have received more and more attention. Lithium batteries are prone to fire or explosion under extreme conditions such as short circuit, overcharge, heat, impact, etc., especially when the external protection circuit fails or is abused, there is a great safety hazard in overcharging. The safety performance area of ​​the lithium battery electrolyte is extremely small, the overcharge resistance is poor, and the thermal stability is low. Improving its safety has become a research hotspot. Traditional methods often use safety measures outside the battery, such as installing current interruption devices, explosion-proof ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0567H01M10/0525
CPCH01M10/0525H01M10/0567H01M2300/0025Y02E60/10
Inventor 蒋涛
Owner SHUANGDENG GRP
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