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A low-temperature lithium ion battery electrolyte and lithium ion battery based on surfactant

A surfactant and lithium-ion battery technology, applied in the field of lithium-ion batteries, can solve problems such as difficult to maintain lithium ion migration rate, reduce reaction kinetics rate, low conductivity, etc., to achieve good performance and ensure low impedance characteristics , the effect of high conductivity

Inactive Publication Date: 2018-12-21
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Under low temperature conditions, carbonate solvents commonly used in electrolytes, such as ethylene carbonate, dimethyl carbonate, ethyl methyl carbonate, etc., have a high viscosity and low conductivity, so it is difficult to maintain a fast lithium ion Migration rate, greatly reducing the reaction kinetic rate

Method used

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  • A low-temperature lithium ion battery electrolyte and lithium ion battery based on surfactant
  • A low-temperature lithium ion battery electrolyte and lithium ion battery based on surfactant

Examples

Experimental program
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Effect test

Embodiment 1

[0022] Mix the mixed solvent of ethylene carbonate, dimethyl carbonate, ethyl methyl carbonate and ethyl propionate at a mass ratio of 30:30:30:10, and then fully dissolve lithium hexafluorophosphate in the premixed solvent, then add mass The fraction is 2.5% vinylene carbonate and 2.5% vinyl sulfate, and finally add 0.2% surfactant tetraethylammonium octanesulfonate, and mix to obtain electrolyte 1; wherein lithium hexafluorophosphate accounts for the mass ratio of the whole electrolyte 14%. The above steps were all performed in a glove box filled with inert gas.

Embodiment 2

[0024] Mix the mixed solvent of ethylene carbonate, dimethyl carbonate, ethyl methyl carbonate and ethyl propionate at a mass ratio of 20:40:20:10, and then fully dissolve lithium hexafluorophosphate in the premixed solvent, then add mass The fraction is 1% vinylene carbonate and 1% lithium bisfluorosulfonimide, and finally add 0.5% surfactant tetraethylammonium octanesulfonate, and mix to obtain electrolyte 2; wherein lithium hexafluorophosphate accounts for the whole The electrolyte mass ratio is 14%. The above steps were all performed in a glove box filled with inert gas.

Embodiment 3

[0026] Mix the mixed solvent of ethylene carbonate, dimethyl carbonate, ethyl methyl carbonate and ethyl propionate at a mass ratio of 20:50:20:1, and then fully dissolve lithium hexafluorophosphate in the premixed solvent, then add mass The fraction is 2% vinylene carbonate and 1% vinyl sulfate, 1% lithium bisfluorosulfonimide, and finally add 0.2% surfactant tetraethylammonium heptadecafluorooctanesulfonate, mix Electrolyte 3 was obtained; the mass ratio of lithium hexafluorophosphate to the whole electrolyte was 14%. The above steps were all performed in a glove box filled with inert gas.

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Abstract

The invention discloses a low-temperature lithium ion battery electrolyte and a lithium ion battery based on a surfactant, which comprises an organic solvent, a lithium salt electrolyte, a surfactantand a film forming additive, wherein the surfactant is octane sulfonate tetraethylammonium salt and derivatives thereof. The invention selects the solvent ratio with low viscosity through the screening combination of the solvents; Vinylene carbonate combined with vinyl sulfate DTD or lithium difluorosulfonimide LiFSI as film forming additive can form low impedance SEI film on the surface of negative electrode. Finally, a small amount of surfactant was added to optimize the viscosity of the electrolyte, and the electrolyte system has good compatibility with the positive and negative electrode materials, and can improve the low-temperature discharge and cycle performance of the lithium ion battery under the low-temperature application environment. The electrolyte system has the advantages oflow viscosity and high conductivity under the low-temperature condition, and the kinetics of lithium ion is improved.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a surfactant-based low-temperature lithium-ion battery electrolyte and a lithium-ion battery. Background technique [0002] As the world's energy demand continues to grow, the consumption of fossil energy on the earth continues to accelerate, which has brought about a series of increasingly prominent environmental problems. Efficient, safe, clean and renewable new energy and related technologies have become a research hotspot around the world. Lithium-ion batteries have the advantages of high energy density, high discharge voltage, and long cycle life, and have firmly occupied the market share of mobile electronic devices, electric vehicles (EV), hybrid electric vehicles (HEV) and other fields. However, as lithium-ion batteries are more and more widely used, people's demand for their comprehensive performance is also increasing. For example, the poor low-temperatur...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0569H01M10/0525
CPCH01M10/0525H01M10/0567H01M10/0569H01M2300/0042Y02E60/10
Inventor 王涂亮庞春光梁大宇
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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