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Use of lithium salt mixtures as li-ion battery electrolytes

A technology of mixture and lithium salt, applied in the field of mixture of lithium salt, can solve the problems of aluminum current collector corrosivity, cost-limited use, etc.

Inactive Publication Date: 2014-08-06
ARKEMA FRANCE SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, LiTFSI presents the disadvantage of being corrosive to aluminum current collectors, which is not the case for LiFSI
Therefore, LiFSI appears to be LiPF 6 promising alternative to , but its cost currently limits its use

Method used

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  • Use of lithium salt mixtures as li-ion battery electrolytes
  • Use of lithium salt mixtures as li-ion battery electrolytes

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] The first mixture made is such that, at ambient temperature, it will comprise 80% by weight of F-SO 2 -NLi-SO 2 -F(LiFSI) and 20% by weight of where Rf=CF 3 The salt mixture of the salt (LiTDI) of formula (I) is dissolved in the mixture of following three kinds of carbonates: ethylene carbonate, dimethyl carbonate and propylene carbonate, each weight ratio is 1 / 3, 1 / 3 and 1 / 3. This mixture gives high ionic conductivity and leads to a passivation layer on the aluminum current collector.

Embodiment 2

[0043] The second mixture made consisted of 50 wt% LiTDI salt and 50 wt% LiPF 6 composition. These two salts were dissolved in a mixture of the following two carbonates: ethylene carbonate and dimethyl carbonate, in a weight ratio of 1 / 3 and 2 / 3, respectively. The mixture gives high ionic conductivity without making LiPF 6 break down.

Embodiment 3

[0045] The third mixture made will contain 60% by weight of CF 3 -SO 2 -NLi-SO 2 -CF 3 A salt mixture of (LiTFSI) and 40% by weight of LiTDI was dissolved in a mixture of the following three carbonates: ethylene carbonate, dimethyl carbonate and propylene carbonate, in respective weight ratios of 1 / 3, 1 / 3 and 1 / 3. This mixture gives high ionic conductivity and results in a passivation layer formed on the aluminum current collector.

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Abstract

The present invention relates to lithium salt mixtures. It also relates to said salt mixtures dissolved in solvents, suitable for being used as electrolytes for Li-ion batteries.

Description

technical field [0001] The present invention relates to mixtures of lithium salts and their use as electrolytes for batteries of the Li-ion type. Background technique [0002] A lithium-ion battery includes at least a negative electrode (anode), a positive electrode (cathode), a separator, and an electrolyte. The electrolyte usually consists of a lithium salt dissolved in a solvent, usually a mixture of organic carbonates, to have a good compromise between viscosity and dielectric constant. Additives can then be added to improve the stability of the electrolyte salt. [0003] The most widely used salts include lithium hexafluorophosphate (LiPF 6 ), which have many of the desirable qualities, but exhibit the disadvantage of decomposing in the form of hydrofluoric acid by reaction with water. This raises safety concerns, especially with the upcoming use of lithium-ion batteries in private cars. [0004] Therefore, other salts such as LiTFSI (lithium bis(trifluoromethanesul...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0568C07D233/00H01M10/0525H01M10/0569
CPCH01M2220/20H01M10/0569H01M2300/0045H01M10/0525H01M10/0568H01M10/052H01M2300/0037H01M2300/0025C07D233/90Y02E60/122Y02E60/10
Inventor G.施密特
Owner ARKEMA FRANCE SA