Low temperature electrolyte for lithium-ion power battery and preparation method thereof

A power battery and lithium-ion technology, which is applied in the field of low-temperature electrolyte for lithium-ion power batteries and its preparation, can solve problems such as poor low-temperature performance of the electrolyte, achieve the effects of reducing content, improving low-temperature performance, and improving low-temperature discharge efficiency

Inactive Publication Date: 2015-07-29
WANXIANG 123 CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] The object of the present invention is to provide a low-temperature electrolyte for lithium-ion power batteries that improves the low-temperature discha

Method used

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  • Low temperature electrolyte for lithium-ion power battery and preparation method thereof

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Embodiment 1

[0030] A preparation method of a low-temperature electrolyte for a lithium-ion power battery, the preparation method is as follows: in a dry, nitrogen-filled glove box, ethylene carbonate, ethyl methyl carbonate, and ethyl propionate are uniformly mixed according to the ratio, and the magnetic induction Stir at 2500GS for 25 minutes, then add additives while stirring within 2 minutes, and continue stirring for 15 minutes at a magnetic induction of 1000GS; then slowly add the solute lithium hexafluorophosphate according to the ratio, turn off the magnetic field, and continue stirring for 30 minutes to obtain a low-temperature electrolyte for lithium-ion power batteries. Among them, the additives are vinyl sulfite and lithium difluorooxalate borate, and the mass parts of each component are 20 parts of ethylene carbonate, 38 parts of ethyl methyl carbonate, 40 parts of ethyl propionate, 1.5 parts of vinyl sulfite and 0.5 part of lithium difluorooxalate borate, and the electrolyte ...

Embodiment 2

[0033] A preparation method of a low-temperature electrolyte for a lithium-ion power battery, the preparation method is as follows: in a dry, nitrogen-filled glove box, ethylene carbonate, ethyl methyl carbonate, and ethyl propionate are uniformly mixed according to the ratio, and the magnetic induction Stir at 2800GS for 30 minutes, then add additives while stirring within 2.5 minutes, and continue stirring for 18 minutes at a magnetic induction of 1200GS; then slowly add the solute lithium hexafluorophosphate according to the ratio, turn off the magnetic field, and continue stirring for 40 minutes to obtain a low-temperature electrolyte for lithium-ion power batteries. Among them, the additives are vinyl sulfite and lithium difluorooxalate borate, and the mass parts of each component are 28 parts of ethylene carbonate, 35 parts of ethyl methyl carbonate, 35 parts of ethyl propionate, 1.8 parts of vinyl sulfite and 0.2 parts of lithium difluorooxalate borate, and the electroly...

Embodiment 3

[0036] A preparation method of a low-temperature electrolyte for a lithium-ion power battery, the preparation method is as follows: in a dry, nitrogen-filled glove box, ethylene carbonate, ethyl methyl carbonate, and ethyl propionate are uniformly mixed according to the ratio, and the magnetic induction The intensity is 3000GS and stirred for 35 minutes, then add the additive while stirring within 3 minutes, the magnetic induction intensity is 1500GS and continue to stir for 20 minutes; then slowly add the solute lithium hexafluorophosphate according to the proportion, turn off the magnetic field, and continue stirring for 45 minutes to obtain a low-temperature electrolyte for lithium-ion power batteries. Among them, the additives are vinyl sulfite and lithium difluorooxalate borate, and the mass parts of each component are 23 parts of ethylene carbonate, 37 parts of ethyl methyl carbonate, 38 parts of ethyl propionate, 1.7 parts of vinyl sulfite and 0.3 parts of lithium difluo...

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Abstract

The invention relates to a low temperature electrolyte for a lithium-ion power battery and a preparation method thereof. Components of the low temperature electrolyte comprise solvents and a solute, wherein the solvents are a mixture of ethylene carbonate, ethyl methyl carbonate, ethyl propionate and an additive. The preparation method comprises steps of uniformly mixing the solvents under a magnetic field and adding the solute. By the use of ethyl propionate, viscosity and eutectic point of the electrolyte system are reduced so as to help migration of lithium ion and reduce content of ethylene carbonate in the electrolyte. Thus, the electrolyte has low melting point and viscosity, and low temperature performance of the electrolyte is improved. By the use of lithium difluoroborate which has good heat stability and oxidation stability, metal dissolution potential of the electrolyte can be improved. The prepared lithium-ion power battery can raise low-temperature discharging efficiency by 15-20% and increase low-temperature mean voltage by 10-15%.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery electrolytes, in particular to a low-temperature electrolyte for lithium-ion power batteries that improves the low-temperature discharge performance of lithium-ion power batteries and a preparation method thereof. [0002] Background technique [0003] Lithium-ion batteries have been widely used since their commercialization in the early 1990s. The principle of this battery is to rely on the different deintercalation-insertion reaction potentials of lithium ions in the positive and negative active materials to obtain a potential difference. Lithium ions flow between the positive and negative electrodes, which is vividly called a rocking chair battery. With the development of the economy and the improvement of people's living standards, people's demand and requirements for power batteries are getting higher and higher. Therefore, power batteries with low cost, good safety, high energy ...

Claims

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Application Information

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IPC IPC(8): H01M10/0569H01M10/0568H01M10/0567
CPCH01M10/0525H01M10/0567H01M10/0568H01M10/0569Y02E60/10
Inventor 李青柱吕豪杰金荣在
Owner WANXIANG 123 CO LTD
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