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Lithium ion battery low temperature electrolyte and lithium ion battery

A lithium-ion battery and electrolyte technology, applied in the field of lithium-ion batteries, can solve problems such as poor discharge performance and achieve the effect of improving low-temperature performance

Active Publication Date: 2015-11-11
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

The electrolyte improves the low-temperature performance of lithium-ion batteries to a certain extent, but its discharge performance at -40°C is still poor.

Method used

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  • Lithium ion battery low temperature electrolyte and lithium ion battery
  • Lithium ion battery low temperature electrolyte and lithium ion battery
  • Lithium ion battery low temperature electrolyte and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The lithium-ion battery low-temperature electrolyte of this embodiment is composed of the following components in weight percent: lithium hexafluorophosphate 5%, lithium fluoride 0.3%, lithium tetrafluoroborate 0.2%, dimethyl carbonate 30%, ethylene carbonate 26.5%, 25% ethyl methyl carbonate, 8% dibutyl carbonate, 2% vinylene carbonate, 2% ethyl propionate, 1% ethyl acetate.

[0018] In a glove box filled with argon gas, the moisture content is controlled to be <0.1ppm, and the oxygen content is <0.1ppm, and the above-mentioned components are uniformly mixed in proportion to obtain a low-temperature electrolyte for lithium-ion batteries.

[0019] The lithium-ion battery of this embodiment uses the ternary material as the positive electrode and artificial graphite as the negative electrode. The above-mentioned lithium-ion battery low-temperature electrolyte is injected into the battery system, and a lithium-ion battery with a battery capacity of 10Ah is prepared by using...

Embodiment 2

[0021] The lithium-ion battery low-temperature electrolyte of this embodiment is composed of the following components in weight percent: 12% lithium hexafluorophosphate, 0.3% lithium fluoride, 1% lithium tetrafluoroborate, 30% dimethyl carbonate, 20% ethylene carbonate, 15% ethyl methyl carbonate, 10% dibutyl carbonate, 3% vinylene carbonate, 5% ethyl propionate, 3.7% ethyl acetate.

[0022] In a glove box filled with argon gas, the moisture content is controlled to be <0.1ppm, and the oxygen content is <0.1ppm, and the above-mentioned components are uniformly mixed in proportion to obtain a low-temperature electrolyte for lithium-ion batteries.

[0023] In the lithium-ion battery of this embodiment, the ternary material is used as the positive electrode and the artificial graphite is used as the negative electrode. The above-mentioned lithium-ion battery low-temperature electrolyte is injected into the battery system, and a lithium-ion battery with a battery capacity of 10Ah i...

Embodiment 3

[0025] The lithium-ion battery low-temperature electrolyte of the present embodiment is composed of the following components in weight percent: 12.5% ​​lithium hexafluorophosphate, 0.5% lithium fluoride, 2% lithium tetrafluoroborate, 20% dimethyl carbonate, 25% ethylene carbonate, 18% ethyl methyl carbonate, 15% dibutyl carbonate, 3% vinylene carbonate, 2% ethyl propionate, 2% ethyl acetate.

[0026] In a glove box filled with argon gas, the moisture content is controlled to be <0.1ppm, and the oxygen content is <0.1ppm, and the above-mentioned components are uniformly mixed in proportion to obtain a low-temperature electrolyte for lithium-ion batteries.

[0027] In the lithium-ion battery of this embodiment, the ternary material is used as the positive electrode and the artificial graphite is used as the negative electrode. The above-mentioned lithium-ion battery low-temperature electrolyte is injected into the battery system, and a lithium-ion battery with a battery capacity ...

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Abstract

The present invention relates to a lithium ion battery low temperature electrolyte and a lithium ion battery, and belongs to the technical field of lithium ion batteries. The lithium ion battery low temperature electrolyte comprises, by weight, 5-20% of lithium hexafluorophosphate, 0.1-3% of lithium fluoride, 0.2-5% of lithium tetrafluoroborate, 48-94.7% of an electrolyte solvent, 2-5% of vinylene carbonate, 2-10% of ethyl propionate, and 1-5% of ethyl acetate. With the lithium ion battery low temperature electrolyte of the present invention, the charge-discharge performance and the cycle performance of the electrolyte at the low temperature can be improved.

Description

technical field [0001] The invention relates to a lithium-ion battery low-temperature electrolyte and a lithium-ion battery, belonging to the technical field of lithium-ion batteries. Background technique [0002] Since the commercialization of lithium-ion secondary batteries, battery performance has been continuously improved, such as energy density, power density, cycle performance, and high-rate discharge performance. With the continuous research and application of new materials and technologies in the field of lithium-ion batteries, the safety of lithium-ion batteries has also been greatly improved. The continuous improvement of the performance of lithium-ion batteries has promoted the wide application of lithium-ion batteries in more and more fields. However, as the application range of lithium-ion batteries becomes wider and wider, the problem of poor adaptability to the application environment becomes increasingly prominent. For example, the charge and discharge per...

Claims

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Application Information

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IPC IPC(8): H01M10/0568H01M10/0569H01M10/0525
CPCH01M10/0525H01M10/0568H01M10/0569H01M2300/0025H01M2300/0028Y02E60/10
Inventor 邵俊华孔东波张利娟邵超闫国锋冯秀娟李海杰
Owner HENAN FAENLAITE NEW ENERGY SCI & TECH CO LTD
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