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Electrolyte of lithium ion battery

A lithium-ion battery and electrolyte technology, applied in secondary batteries, circuits, electrical components, etc., can solve the problems of poor high-temperature cycle performance, low-temperature, and high-temperature cycle performance of lithium-ion batteries, and promote the production of SEI films , improve the cycle performance, improve the effect of stability

Active Publication Date: 2013-05-15
DO FLUORIDE CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the electrolyte system has good safety performance and active material capacity, the low-temperature and high-temperature cycle performance is not ideal, so the low-temperature and high-temperature cycle performance of the prepared lithium-ion battery is poor, which can no longer meet the market demand for power lithium-ion batteries. Battery needs to be further improved

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] The lithium ion battery electrolyte provided by the present embodiment is made of lithium hexafluorophosphate LiPF 6 , mixed solvent and additive composition, lithium hexafluorophosphate LiPF 6 The concentration is 1.1mol / L, and the mixed solvent is a mixture of diethyl carbonate DEC, vinyl methyl carbonate EMC, dimethyl carbonate DMC and ethylene carbonate EC, wherein diethyl carbonate DEC, methyl vinyl carbonate EMC, carbonic acid The volume ratio of dimethyl carbonate DMC and ethylene carbonate EC is: diethyl carbonate DEC: vinyl methyl carbonate EMC: dimethyl carbonate DMC: ethylene carbonate EC = 1: 2: 1: 1, the additive is vinylene carbonate A mixture of ester VC, γ-butyrolactone GBL and hexamethyldisilazane HMDS, the concentration of vinylene carbonate VC is 10wt%, the concentration of γ-butyrolactone GBL is 10wt%, hexamethyldisilazane The concentration of alkane HMDS was 5 wt%.

[0015] Randomly select 20 1665132 batteries that have not been injected, and inje...

Embodiment 2

[0017] The lithium ion battery electrolyte provided by the present embodiment is made of lithium hexafluorophosphate LiPF 6 , mixed solvent and additive composition, lithium hexafluorophosphate LiPF 6 The concentration is 1.0mol / L, and the mixed solvent is a mixture of diethyl carbonate DEC, vinyl methyl carbonate EMC, dimethyl carbonate DMC and ethylene carbonate EC, wherein diethyl carbonate DEC, methyl vinyl carbonate EMC, carbonic acid The volume ratio of dimethyl carbonate DMC and ethylene carbonate EC is: diethyl carbonate DEC: vinyl methyl carbonate EMC: dimethyl carbonate DMC: ethylene carbonate EC = 1: 2: 1: 1, the additive is vinylene carbonate A mixture of ester VC, γ-butyrolactone GBL and hexamethyldisilazane HMDS, the concentration of vinylene carbonate VC is 1 wt%, the concentration of γ-butyrolactone GBL is 1 wt%, hexamethyldisilazane The concentration of alkane HMDS was 1 wt%.

[0018] Randomly select 20 1665132 batteries that have not been filled with liquid...

Embodiment 3

[0020] The lithium ion battery electrolyte provided by the present embodiment is made of lithium hexafluorophosphate LiPF 6 , mixed solvent and additive composition, lithium hexafluorophosphate LiPF 6 The concentration is 1.0mol / L, and the mixed solvent is a mixture of diethyl carbonate DEC, vinyl methyl carbonate EMC, dimethyl carbonate DMC and ethylene carbonate EC, wherein diethyl carbonate DEC, methyl vinyl carbonate EMC, carbonic acid The volume ratio of dimethyl carbonate DMC and ethylene carbonate EC is: diethyl carbonate DEC: vinyl methyl carbonate EMC: dimethyl carbonate DMC: ethylene carbonate EC = 1: 3: 1: 1, the additive is vinylene carbonate A mixture of ester VC, γ-butyrolactone GBL and hexamethyldisilazane HMDS, the concentration of vinylene carbonate VC is 2wt%, the concentration of γ-butyrolactone GBL is 5wt%, hexamethyldisilazane The concentration of alkane HMDS was 2 wt%.

[0021] Randomly select 20 1665132 batteries that have not been filled with liquid, ...

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Abstract

The invention discloses an electrolyte of a lithium ion battery. The electrolyte comprises lithium hexafluorophosphate LiPF6, a mixed solvent and an additive, wherein the mixed solvent comprises three to four out of diethyl carbonate (DEC), ethyl methyl carbonate (EMC), dimethyl carbonate (DMC), ethylene carbonate (EC) and propylene carbonate (PC); and the additive is a mixture of vinylene carbonate (VC), gamma-butyrolactone (GBL) and hexamethyl disilazane (HDMS). The lithium ion battery produced by adopting the electrolyte provided by the invention is excellent in high temperature and low temperature performances, and is remarkably improved in performances. The electrolyte of the lithium ion battery, provided by the invention, can simultaneously meet the requirements on use in a high temperature environment and a low temperature environment of -40-70 DEG C, and can not influence the service life of the battery.

Description

technical field [0001] The invention relates to the technical field of manufacturing lithium ion batteries, in particular to an electrolyte solution for lithium ion batteries. Background technique [0002] Lithium-ion batteries have the advantages of high voltage platform and no memory performance, and are currently widely used in portable electronic devices such as mobile phones, laptop computers, and large and medium-sized electric devices such as power tools and electric bicycles. However, the application range of lithium-ion batteries is also limited by some conditions, for example, the ambient temperature of the application is one of the important factors. At present, most lithium-ion battery manufacturers in China use LiPF as the most electrolyte system for lithium-ion batteries. 6 / EC+DMC+EMC, wherein the mass ratio of solvents EC, DMC, and EMC is: EC:DMC:EMC is 1:1:1. Although the electrolyte system has good safety performance and active material capacity, the low-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567
CPCY02E60/12Y02E60/10
Inventor 侯红军杨华春邵俊华余维海李云峰陈宏伟尚钟声郝建堂李小强
Owner DO FLUORIDE CHEM CO LTD
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