Safe non-aqueous electrolyte for battery

A non-aqueous electrolyte, safe technology, applied in the direction of secondary batteries, circuits, electrical components, etc., can solve the problems of high freezing point, affecting the low-temperature performance of the battery, and reducing the conductivity, so as to achieve improved low-temperature performance, excellent safety performance, The effect of improving stability

Active Publication Date: 2014-04-30
福建邵武创鑫新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, ethylene carbonate has a high freezing point (39°C), and it is solid at room temperature. At low temperatures, the electrolyte solidifies and the conductivity decreases, which greatly affects the low-temperature performance of the battery.

Method used

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  • Safe non-aqueous electrolyte for battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The electrolyte composition is as follows: Lithium salt LiPF 6 Mass concentration 1.0mol·L -1 , organic solvent propylene carbonate, cyclic phosphazene compound represented by structural formula (I) (wherein R 1 ~R 5 is fluorine, R 6 Ethoxy) and diethyl carbonate (mass ratio 20:20:60), the additive vinyl vinyl sulfite (VES) accounts for 3% of the total mass of the electrolyte, and the additive VC accounts for 2% of the total mass of the electrolyte.

[0022] The prepared electrolyte is injected into the positive electrode according to the conventional battery manufacturing process. Lithium cobaltate , Negative pole graphite flexible packaging battery. The battery design capacity is 1000mAh. The battery is formed according to the following process: 0.02C constant current charging to 2.8V, 0.05C constant current charging to 3.3 V, 0.1C constant current charging to 4.2 V, 4.2 V constant voltage charging, cut-off current 0.033 c. After the formation, the battery i...

Embodiment 2

[0035] The electrolyte composition is as follows: Lithium salt LiPF 6 Concentration 1.0 mol·L -1 , organic solvent propylene carbonate, cyclic phosphazene compound represented by general formula (I) (wherein R 1 ~R 5 is fluorine, R 6 methoxy) and diethyl carbonate (mass ratio 25:5:70), the additive vinyl vinyl sulfite (VES) accounted for 3% of the total electrolyte, and the additive VC accounted for the total electrolyte The mass percentage of the amount is 2%.

Embodiment 3

[0037] The electrolyte composition is as follows: Lithium salt LiPF 6 concentration 0.8 mol L -1 , organic solvent propylene carbonate, cyclic phosphazene compound represented by general formula (I) (wherein R 1 ~R 6 Fluorine) and diethyl carbonate (mass ratio 20:10:70), the additive vinyl vinyl sulfite (VES) accounted for 3% of the total electrolyte, the additive VC accounted for 3% of the total electrolyte The mass percentage content is 2%.

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Abstract

The invention discloses safe non-aqueous electrolyte for a battery. The electrolyte comprises a lithium salt, an organic solvent and an additive, wherein the organic solvent comprises a cyclic compound and chain carbonate; the cyclic compound comprises propylene carbonate and a cyclic phosphonitrile compound. The electrolyte takes a flame-retardant compound as a solvent, has high safety performance, low-temperature performance and high-temperature cycle performance and is safe electrolyte which can be used in a wide temperature range. Meanwhile, due to a matched synergistic effect of the solvent and the additive, the battery has high electrochemical performance, the capacity of a lithium ion battery using the electrolyte can be fully exerted, and the battery has excellent safety performance, high-temperature resistance, low-temperature performance and long cycle life.

Description

Technical field [0001] The invention involves the field of electrolytic liquid technology in batteries, which specifically involves a kind of safe non -hydrolysis solution for battery. Background technique [0002] Lithium -ion batteries are widely used as portable electronic products as a reliable energy source for its high -ratio energy, high voltage, no memory effect, environmental protection, and long life.However, in recent years, there have been many battery safety accidents in various countries. This is mainly due to the safety problems caused by thermal loss caused by the battery (thermal impact, overcharge, short circuit, etc.), especially in electric vehicles, etc.In terms of large -capacity power applications, safety issues are particularly important.At present, the electrolytes of lithium -ion batteries are mostly electrolytes of organic liquids, consisting of organic solvents and conductive lithium salts.Common organic solvents are alkyl carbonate, such as carbonate ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0569
CPCH01M10/0525H01M10/0569Y02E60/10
Inventor 卞锋菊张忠如刘新平杨勇祖利洲闫春凤黄当睦吴茂祥
Owner 福建邵武创鑫新材料有限公司
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