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Lithium ion battery electrolyte with both high and low temperature performances

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

Active Publication Date: 2014-08-13
DONGGUAN SHANSHAN BATTERY MATERIALS
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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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  • Lithium ion battery electrolyte with both high and low temperature performances
  • Lithium ion battery electrolyte with both high and low temperature performances
  • Lithium ion battery electrolyte with both high and low temperature performances

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 solvents 82.5%

[0040] Film-forming additives 3.0%

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

[0042] Lithium salt type 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 imp...

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 solvents 68.5%

[0052] Film-forming additives 1.0%

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

[0054] Lithium salt type 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-temperat...

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 additives 1.0%

[0065] Additives to improve dielectric constant and low temperature wetting ability 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...

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Abstract

The invention relates to the technical field of lithium ion electrolytes, and in particular relates to a lithium-ion battery electrolyte with both high and low temperature performances. The electrolyte comprises lithium hexafluorophosphate, mixed organic solvents, filming additives, additives for improving the dielectric constant and the low temperature infiltration capability, and a lithium salt type additive, wherein the mixed organic solvents comprise a carbonic ester solvent and a linear carboxylic ester solvent; the linear carboxylic ester solvent in the mixed organic solvents is one or a mixture of more than two of ethyl propionate, propionic acid n-propyl ester, n-propyl acetate, acetic acid n-butyl ester and isobutyl acetate; and the additives for improving the dielectric constant and the low temperature infiltration capability are one or a mixture of more than two of fluoro ethylene carbonate, difluoro ethylene carbonate and 4-trifluoromethyl ethylene carbonate. A battery prepared from the lithium-ion battery electrolyte with both high and low temperature performances is long in service life, and both the good low temperature discharge performance of the battery is ensured, and the storage performance of the battery at the high temperature of 60 DEG C is effectively considered.

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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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 DONGGUAN SHANSHAN BATTERY MATERIALS
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