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Pseudo high-concentration ester lithium-sulfur battery electrolyte and lithium-sulfur battery

A lithium-sulfur battery and electrolyte technology, applied in the field of pseudo-high-concentration ester lithium-sulfur battery electrolyte, can solve problems such as high viscosity and low conductivity

Active Publication Date: 2017-06-09
CHINA JILIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The object of the present invention is to provide a battery electrolyte for lithium-sulfur batteries, which can solve the problems of high viscosity and low conductivity of ester electrolytes for high-concentration lithium-sulfur batteries

Method used

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  • Pseudo high-concentration ester lithium-sulfur battery electrolyte and lithium-sulfur battery
  • Pseudo high-concentration ester lithium-sulfur battery electrolyte and lithium-sulfur battery
  • Pseudo high-concentration ester lithium-sulfur battery electrolyte and lithium-sulfur battery

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Embodiment 1

[0027] A lithium-ion battery electrolyte, including two carbonate solvents of ethylene carbonate (EC) and ethyl methyl carbonate (EMC), with LiTFSI as the lithium salt. The preparation method is as follows: mix EC and EMC at a volume ratio of 1:1, and then add LiTFSI to make the concentration reach 5.0 mol / L. Afterwards, HFMOP is added to the electrolyte, so that the mass fraction of HFMOP in the electrolyte is 40%, so as to obtain the lithium-sulfur battery electrolyte.

Embodiment 2

[0029] A lithium-ion battery electrolyte, including two carbonate solvents of ethylene carbonate (EC) and ethyl methyl carbonate (EMC), with LiTFSI as the lithium salt. The preparation method is as follows: mix EC and EMC at a volume ratio of 1:1, and then add LiTFSI to make the concentration reach 5.0 mol / L. Then add HFEOP to the electrolyte, so that the mass fraction of HFEOP in the electrolyte is 50%, to obtain the lithium-sulfur battery electrolyte.

Embodiment 3

[0031] A kind of lithium ion battery electrolyte, comprises two kinds of carbonate solvents of ethylene carbonate (EC), ethyl methyl carbonate (EMC), with LiPF 6 For lithium salt. Its preparation method is: mix EC and EMC at a volume ratio of 1:1, and then add LiPF 6 , so that the concentration reaches 5.0mol / L. Then add HFTFPOP to the electrolyte, so that the mass fraction of HFTFPOP in the electrolyte is 60%, to obtain the lithium-sulfur battery electrolyte.

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Abstract

The invention discloses a pseudo high-concentration ester lithium-sulfur battery electrolyte. The electrolyte is a battery electrolyte containing lithium salt, an ester solvent and a non-solvent solution, the concentration of the lithium salt in the ester solvent is higher than 3.0 mol / L, and the overall concentration of the lithium salt in the pseudo high-concentration electrolyte is not lower than 0.5 mol / L. According to the battery electrode provided by the invention, the problems such as high viscosity and low conductivity of the lithium-sulfur battery electrolyte using the high-concentration lithium salt can be improved, the electrolyte has incombustibility, and the electrochemical performance and safety of the lithium-sulfur battery can be obviously improved.

Description

technical field [0001] The invention relates to a pseudo-high-concentration ester lithium-sulfur battery electrolyte, which is mainly used in lithium-sulfur batteries. Background technique [0002] The theoretical specific capacity of the lithium-sulfur battery is 1675mAh / g, and the theoretical specific energy is 2600Wh / Kg, much higher than the existing lithium-ion batteries. Moreover, sulfur reserves are abundant, the price is low, low toxicity and no pollution. Therefore, lithium-sulfur batteries have become candidates for next-generation high-energy lithium batteries and have attracted worldwide attention. Lithium polysulfide, an intermediate product of lithium-sulfur batteries, will directly react with esters. Lithium-sulfur batteries generally use ethers as electrolyte solvents, rather than carbonates and carboxylates used in lithium-ion battery electrolytes. The solubility of lithium polysulfide in the ether electrolyte is high, and the lithium polysulfide dissolved ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0566H01M10/052
CPCH01M10/052H01M10/0566H01M10/0567Y02E60/10
Inventor 黄飞飞雷若姗田颖张军杰徐时清
Owner CHINA JILIANG UNIV