An electrolyte solution for lithium-ion batteries with both high and low temperature performance

A lithium-ion battery, high and low temperature technology, applied in the direction of secondary batteries, circuits, electrical components, etc., can solve the problems of unsatisfactory high-temperature storage performance, short battery cycle life, and unsatisfactory low-temperature discharge performance, etc., to broaden the working temperature range , High electrochemical reactivity, improve the effect of low temperature discharge platform

Active Publication Date: 2016-06-08
SHANSHAN ADVANCED MATERIALS QUZHOU CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In addition, in the Chinese invention patent applications of CN103000944A, CN102306837A and CN101252207, the disclosed lithium-ion battery electrolytes all have the defects of short battery cycle life, unsatisfactory high-temperature storage performance and unsatisfactory low-temperature discharge performance.

Method used

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  • An electrolyte solution for lithium-ion batteries with both high and low temperature performance
  • An electrolyte solution for lithium-ion batteries with both high and low temperature performance
  • An electrolyte solution for lithium-ion batteries with both high and low temperature performance

Examples

Experimental program
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Effect test

Embodiment 1

[0037] A lithium-ion battery electrolyte that takes into account both high and low temperature performance, it includes the following components by weight percentage:

[0038] Lithium hexafluorophosphate 12.0%

[0039] Mixed organic solvent 82.5%

[0040] Film-forming additive 3.0%

[0041] Additives to improve dielectric constant and low temperature wettability 2.0%

[0042] Lithium salt additive 0.5%;

[0043] In this embodiment, the mixed organic solvent includes 80wt% carbonate solvent and 20wt% linear carboxylate solvent;

[0044]In the present embodiment, carbonate solvent is ethylene carbonate, propylene carbonate, dimethyl carbonate and ethyl methyl carbonate; Linear carboxylate solvent is ethyl propionate and n-propyl propionate; Wherein, ethylene carbonate , propylene carbonate, dimethyl carbonate, ethyl methyl carbonate, ethyl propionate, and n-propyl propionate are 20% by weight: 5%: 10%: 45%: 10%: 10%.

[0045] In this example, the additives to improve the di...

Embodiment 2

[0049] A lithium-ion battery electrolyte that takes into account both high and low temperature performance, it includes the following components by weight percentage:

[0050] Lithium hexafluorophosphate 15.0%

[0051] Mixed organic solvent 68.5%

[0052] Film-forming additive 1.0%

[0053] Additives to improve dielectric constant and low temperature wettability 15.0%

[0054] Lithium salt additive 0.5%;

[0055] In the present embodiment, mixed organic solvent comprises 50wt% carbonate solvent and 50wt% linear carboxylate solvent;

[0056] In the present embodiment, carbonate solvent is ethylene carbonate, dimethyl carbonate and methyl propyl carbonate; Linear carboxylate solvent is n-butyl acetate and isobutyl acetate; Wherein, ethylene carbonate, dimethyl carbonate , Methyl propyl carbonate, n-butyl acetate and isobutyl acetate are 25% by weight: 10%: 15%: 25%: 25%.

[0057] In this embodiment, the additive to improve the dielectric constant and low-temperature wettabi...

Embodiment 3

[0061] A lithium-ion battery electrolyte that takes into account both high and low temperature performance, it includes the following components by weight percentage:

[0062] Lithium hexafluorophosphate 11.0%

[0063] Mixed organic solvent 84.0%

[0064] Film-forming additive 1.0%

[0065] Additives to improve dielectric constant and low temperature wettability 2.0%

[0066] Lithium salt type additive 2.0%;

[0067] In the present embodiment, mixed organic solvent comprises 70wt% carbonate solvent and 30wt% linear carboxylate solvent;

[0068] In the present embodiment, carbonate solvent is ethylene carbonate, propylene carbonate and ethyl methyl carbonate; Linear carboxylate solvent is ethyl propionate; Wherein, ethylene carbonate, propylene carbonate, ethyl methyl carbonate and propylene carbonate The weight percentage of ethyl acetate is 20%: 5%: 45%: 30%.

[0069] In this embodiment, the additive to improve the dielectric constant and low-temperature wettability is f...

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Abstract

The invention relates to the technical field of lithium-ion battery electrolytes, in particular to lithium-ion battery electrolytes with both high and low temperature performance, including: lithium hexafluorophosphate, mixed organic solvents, film-forming additives, additives for improving dielectric constant and low-temperature wetting ability, and lithium salts Type additives; mixed organic solvents include carbonate solvents and linear carboxylate solvents; linear carboxylate solvents in mixed organic solvents are ethyl propionate, n-propyl propionate, n-propyl acetate, n-butyl acetate and isobutyl acetate or a mixture of any two or more; the additives to improve the dielectric constant and low-temperature wettability are fluoroethylene carbonate, difluoroethylene carbonate and 4-trifluoromethylethylene carbonate one or a mixture of any two or more. The battery prepared by using the lithium-ion battery electrolyte with both high and low temperature performance has a long cycle life, and not only ensures that the battery has good low-temperature discharge performance, but also can effectively take into account the storage performance of the battery at a high temperature of 60°C.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery electrolytes, in particular to a lithium-ion battery electrolyte with both high and low temperature performance. Background technique [0002] The electrolyte is the carrier of ion transmission in the lithium battery, and the electrolyte plays a vital role in the performance of the lithium ion battery in all aspects. With the diversified development of lithium-ion battery applications, the performance requirements for electrolytes are also getting higher and higher, especially in the military and aerospace fields, lithium-ion batteries are required to take into account both high and low temperature performance. Therefore, it is of great significance to develop an electrolyte that can take into account both high and low temperature performance. [0003] In the Chinese invention patent application with the publication number CN103500850A, the organic solvent used in the lithium-ion batt...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0567H01M10/0569
CPCH01M10/0525H01M10/0567H01M10/0569Y02E60/10
Inventor 吕家斌郭明黄慧聪龚雪梅夏南南丁祥欢
Owner SHANSHAN ADVANCED MATERIALS QUZHOU CO LTD
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