High-rate electrolyte of lithium ion battery

A lithium-ion battery and electrolyte technology, applied in the field of lithium batteries, can solve the problems of affecting the performance of battery cycle, increase the cost, and the content cannot be too high, and achieve the effects of increasing the rate, improving the safety, and improving the flame retardant performance.

Inactive Publication Date: 2019-03-01
HENAN FAENLAITE NEW ENERGY SCI & TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the prior art, the rate of lithium batteries is generally increased by adding additives. For high-rate lithium batteries, two kinds of additives are generally used: 1. film-forming additives (such as VC, PS, etc.), 2. surfactants, adding these two kinds of additives The purpose of the additive is not only to improve the interface between the electrolyte and the SEI film, reduce the impedance of the SEI film, but also to accelerate the electrolyte to wet the pole piece, diaphragm and improve the migration environment of lithium ions in the electrolyte bulk solution during high current discharge. And diffuse the environment in the pole piece, thereby improving the rate performance of the lithium-ion battery, and the content of these two additives should not be too high, otherwise it will affect the cycle performance of the battery and increase the cost

Method used

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Examples

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Effect test

Embodiment 1

[0023] A high-rate electrolyte solution for lithium-ion batteries, including electrolyte lithium salt, organic solvent, and flame-retardant additive;

[0024] The electrolyte lithium salt is a mixture of lithium hexafluorophosphate and lithium bisfluorosulfonimide; the molar ratio of lithium hexafluorophosphate and lithium bisfluorosulfonimide is 12:1; the amount of lithium salt added in the electrolyte is 1.3mol / L;

[0025] The organic solvent is a mixture of ethylene carbonate, dimethyl carbonate, and ethyl methyl carbonate; the mass ratio of ethylene carbonate, dimethyl carbonate, and ethyl methyl carbonate is 1:1:1;

[0026] The flame retardant additive is fluoroethylene carbonate; the added amount of the flame retardant additive accounts for 2% of the mass of the electrolyte.

Embodiment 2

[0028] A high-rate electrolyte solution for lithium-ion batteries, including electrolyte lithium salt, organic solvent, and flame-retardant additive;

[0029] The electrolyte lithium salt is a mixture of lithium hexafluorophosphate and lithium bisfluorosulfonimide; the molar ratio of lithium hexafluorophosphate and lithium bisfluorosulfonimide is 12:3; the amount of lithium salt added in the electrolyte is 1.5mol / L;

[0030] Organic solvent is the mixture of ethylene carbonate, dimethyl carbonate, diethyl carbonate, ethyl methyl carbonate; The mass ratio of ethylene carbonate, dimethyl carbonate, diethyl carbonate, ethyl methyl carbonate is 1:0.4: 0.5:1;

[0031] The flame retardant additive is ethoxy pentafluorocyclotriphosphazene; the added amount of the flame retardant additive accounts for 5% of the mass of the electrolyte.

Embodiment 3

[0033] A high-rate electrolyte solution for lithium-ion batteries, including electrolyte lithium salt, organic solvent, and flame-retardant additive;

[0034] The electrolyte lithium salt is a mixture of lithium hexafluorophosphate and lithium bisfluorosulfonyl imide; the molar ratio of lithium hexafluorophosphate and lithium bisfluorosulfonyl imide is 12:5; the amount of lithium salt added to the electrolyte is 1.7mol / L;

[0035] The organic solvent is a mixture of ethylene carbonate, propylene carbonate, and diethyl carbonate; the mass ratio of ethylene carbonate, propylene carbonate, and diethyl carbonate is 1:1:2;

[0036] The flame retardant additive is lithium trifluoromethanesulfonate; the added amount of the flame retardant additive accounts for 3% of the mass of the electrolyte.

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Abstract

The invention discloses a high-rate electrolyte of a lithium ion battery. According to the electrolyte provided by the invention, a mixed lithium salt composed of lithium hexafluorophosphate and lithium bis(fluorosulfonyl)imide is used in the electrolyte, so that the conductivity of the electrolyte can be improved, the transference number of lithium ions can be increased, a passivation film with low impedance is formed, therefore, the rate of the electrolyte is increased; meanwhile, a flame retardant additive is added into the electrolyte, so that the flame retardancy of the electrolyte can befurther improved, and the safety of the electrolyte is indirectly improved.

Description

technical field [0001] The invention belongs to the technical field of lithium batteries, in particular to a high-rate electrolyte for lithium ion batteries. Background technique [0002] Lithium-ion batteries have the characteristics of high specific energy, high specific power, and long cycle life. At present, lithium-ion batteries have been widely used in consumer electronics and other fields. With the development of new energy vehicles, lithium-ion batteries are becoming more and more common in the power field, and will have greater development potential and market prospects. [0003] In the prior art, the rate of lithium batteries is generally increased by adding additives. For high-rate lithium batteries, two kinds of additives are generally used: 1. film-forming additives (such as VC, PS, etc.), 2. surfactants, adding these two kinds of additives The purpose of the additive is not only to improve the interface between the electrolyte and the SEI film, reduce the imp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0568H01M10/0569H01M10/0525
CPCH01M10/0525H01M10/0567H01M10/0568H01M10/0569H01M2300/0025H01M2300/0037Y02E60/10
Inventor 邵俊华孔东波张利娟王亚洲郭飞王珂珂闫国锋乔文忠李海杰侯红岐谢佳庆卢小波
Owner HENAN FAENLAITE NEW ENERGY SCI & TECH CO LTD
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