A kind of intrinsically safe electrolyte for secondary lithium-sulfur battery and preparation method thereof

A lithium-sulfur battery and electrolyte technology, which is applied in the field of intrinsically safe electrolyte for secondary lithium-sulfur battery and its preparation, can solve the problem that the rate performance of high-viscosity battery of electrolyte cannot be exerted, and high-efficiency lithium metal deposition and dissolution cannot be realized. , low coulombic efficiency deposition and dendrite morphology, etc., to achieve the effect of improving safety performance and electrochemical performance, safety performance and electrochemical performance improvement, and improving electrochemical performance

Active Publication Date: 2022-07-15
SHANGHAI JIAOTONG UNIV
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Problems solved by technology

However, the above-mentioned systems all have the following problems: firstly, high-efficiency lithium metal deposition and dissolution cannot be achieved, and the low Coulombic efficiency deposition and dendrite morphology cannot guarantee the safe operation of lithium-sulfur batteries in actual batteries; secondly, the high viscosity of the above-mentioned electrolyte makes the battery The magnification performance of the

Method used

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  • A kind of intrinsically safe electrolyte for secondary lithium-sulfur battery and preparation method thereof
  • A kind of intrinsically safe electrolyte for secondary lithium-sulfur battery and preparation method thereof
  • A kind of intrinsically safe electrolyte for secondary lithium-sulfur battery and preparation method thereof

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preparation example Construction

[0050] The preparation method of the positive electrode of the lithium-sulfur secondary battery includes the following steps: uniformly dispersing the sulfur-containing material, the binder and the conductive agent in water in a mass ratio of 60-80:2-20:4-40, and then coating them on the collector On the fluid, the positive electrode of the lithium-sulfur secondary battery is obtained by pressing after drying.

[0051] The sulfur-containing material is elemental sulfur S 8 , Lithium polysulfide 2 S n (where 1≤n≤8), sulfur-based composites, organosulfur compounds or carbon-sulfur polymers (C 2 S x ) n (where x is 2-20, and n≥2); wherein the sulfur-based composite material is a mixture of elemental sulfur and polyacrylonitrile in a mass ratio of 4-16:1, heated to 250-400°C under nitrogen protection and kept for 1- 16 hours to get.

[0052] The molecular weight of the polyacrylonitrile is 10,000-1,000,000.

[0053] The conductive agent is acetylene black or conductive grap...

Embodiment 1

[0059] Mix trimethyl phosphate and hydrofluoroether HFE458 (1,1,2,2-tetrafluoroethyl-2,2,3,3-tetrafluoropropyl ether) uniformly in a glove box according to a certain volume ratio, stir well , the volume ratio of the two solvents is 1:4, so as to obtain a mixed solvent. figure 1 , the solvent does not burn on a flame.

Embodiment 2

[0061] In the glove box, uniformly mix triethyl phosphate and methyl nonafluorobutyl ether (MFE) according to a certain volume ratio, stir evenly, and the volume ratio of the two solvents is 1:0.5 to obtain a mixed solvent, into which LiODFB is added , dubbed 0.5M salt solution, the flame retardant properties are still maintained.

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Abstract

The present invention relates to an intrinsically safe electrolyte for a secondary lithium-sulfur battery and a preparation method thereof. The electrolyte comprises a lithium salt and an organic solvent, and the organic solvent is a phosphate solvent or a phosphate solvent and a hydrofluoroether. A mixed solvent composed of a similar solvent; lithium salt is added to the organic solvent, and the electrolyte is uniformly stirred to form an electrolyte, that is, an intrinsically safe electrolyte for a secondary lithium-sulfur battery is prepared. Compared with the prior art, the lithium-sulfur battery after using the electrolyte can realize safe cycling, which is embodied in the uniform lithium deposition morphology, no obvious dendrites and complete flame retardancy. On this basis, the electrochemical performance is significantly improved. , which is more advantageous than other sulfur materials and lithium metal batteries.

Description

technical field [0001] The invention relates to the technical field of secondary lithium-sulfur battery electrolyte, in particular to an intrinsically safe electrolyte for secondary lithium-sulfur battery and a preparation method thereof. Background technique [0002] Lithium-sulfur secondary battery refers to a rechargeable battery that uses metal lithium as the negative electrode and sulfur-containing materials (including elemental sulfur, sulfur-based composite materials or organic sulfides) as the positive electrode, and has a high energy density (theoretical capacity density is 1672mAh / g) , long cycle life, low cost (the price of elemental sulfur is low) and other advantages, is the development direction of the next generation of batteries. [0003] Based on our previous studies, the Li / S@pPAN battery exhibits the best cycling performance in the 1M LiPF6 / EC+DMC (1:1, v / v) electrolyte system, but its safety and electrochemical performance remain to be seen improve. Thi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0569H01M10/052
CPCH01M10/052H01M10/0569H01M2300/0028Y02E60/10
Inventor 王久林杨慧军陈加航杨军
Owner SHANGHAI JIAOTONG UNIV
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