Flame-retardant electrolyte for secondary lithium-sulfur battery and preparation method thereof

A lithium-sulfur battery and electrolyte technology, which is applied to the secondary lithium-sulfur battery electrolyte system, flame-retardant electrolyte and the field of preparation thereof, achieves the effects of small electrical conductivity, reduced flammability, and taking into account the flame-retardant effect

Inactive Publication Date: 2012-09-19
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese patent CN101702445A discloses a flame retardant (dimethyl methyl phosphonate) for lithium-ion battery electrolyte. The flame retardant has no effect on battery performance and has a good flame retardant effect on the electrolyte, but no Any reports on the application of flame retardant additives to lithium-sulfur batteries

Method used

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  • Flame-retardant electrolyte for secondary lithium-sulfur battery and preparation method thereof
  • Flame-retardant electrolyte for secondary lithium-sulfur battery and preparation method thereof
  • Flame-retardant electrolyte for secondary lithium-sulfur battery and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0029] In the glove box, EC and EMC were uniformly mixed at a volume ratio of 1:1, and LiPF was added to the mixed solvent 6 , and stir evenly to make an electrolyte solution with a concentration of 1mol / L. Then add the flame retardant DMMP to the electrolyte to obtain the flame retardant electrolyte, the mass percentage content of the DMMP accounting for the total weight of the flame retardant electrolyte is respectively 7%, 11%, 15%, 21%, 30%, 50%.

Embodiment 2

[0031] Mix EC, PC, and DEC uniformly in a volume ratio of 1:1:1 in a glove box, and add LiPF to the mixed solvent 6 , and stir evenly to make an electrolyte solution with a concentration of 0.5mol / L. Then add the flame retardant TTEP to the electrolyte to obtain the flame retardant electrolyte, and the mass percent content of the TTEP accounted for the total weight of the flame retardant electrolyte is respectively 1%, 7%, 11%, 15%, 21%, 30% %, 50%.

Embodiment 3

[0033] In the glove box, DOL and DMC were uniformly mixed at a volume ratio of 1:1, and LiN(CF 3 SO 2 ) 2 , and stir evenly to make an electrolyte solution with a concentration of 2mol / L. Then add flame retardants TPP(i) and TPP (the volume ratio of the two is 1:1) to the electrolyte to obtain a flame retardant electrolyte, and the TPP(i) accounts for the mass percentage content of the total weight of the flame retardant electrolyte They are 1%, 7%, 11%, 15%, 21%, 30%, and 50%, respectively.

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Abstract

The invention discloses a flame-retardant electrolyte for a secondary lithium-sulfur battery and a preparation method thereof. The electrolyte is prepared by adding a phosphorus-containing flame retardant on the basis of the conventional lithium ion electrolyte, and the flame retardant accounts for 1-50 percent by mass of the total weight of the electrolyte. The invention further discloses a secondary lithium-sulfur battery prepared by using an electrolyte which contains an appropriate amount of flame-retardant additive. According to charging and discharging tests at the voltage of 1.0-3.0V, the electrochemical performance is not influenced, and the volume keeping rate is high after 50 cycles; and moreover, the flammability of the electrolyte is lowered greatly, and the safety performance of the lithium-sulfur battery can be enhanced.

Description

technical field [0001] The invention relates to a secondary lithium-sulfur battery electrolyte system, in particular to a flame-retardant electrolyte for a secondary lithium-sulfur battery and a preparation method thereof, and a lithium-sulfur battery assembled from the flame-retardant electrolyte. Background technique [0002] Conventional lithium-ion batteries are limited by the capacity of their cathode materials and have a low energy density (about 150Wh kg -1 ), which cannot meet the needs of large electric vehicles, while rechargeable lithium-sulfur batteries have a considerable theoretical energy density (2600Whkg -1 ). However, the practical application of lithium-sulfur batteries also needs to consider the safety issues similar to those of traditional lithium-ion batteries. First of all, most of the electrolytes of lithium-sulfur batteries now use ether organic solvents, such as 1,3-dioxolane (DOL) and ethylene glycol dimethyl ether (DME), and some use carbonate o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/052
CPCY02E60/122Y02E60/10
Inventor 王久林林凤姣杨军努丽燕娜
Owner SHANGHAI JIAO TONG UNIV
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