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Electrolyte for metal-sulfur secondary battery and metal-sulfur secondary battery containing electrolyte

A sulfur secondary battery and electrolyte technology, applied in the field of metal-sulfur secondary batteries, can solve the problems of poor mechanical stability of SEI film, environmental pollution of additives, and single function of additives, and achieve low price, improved cycle performance, and inhibited shuttling effect of effect

Pending Publication Date: 2022-01-14
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The mechanical stability of this SEI film is relatively poor. During the metal stripping / deposition process, the SEI film ruptures due to stress changes, and then metal dendrites are generated at the cracks.
The growth of dendrites is unfavorable, which will not only lead to a decrease in Coulombic efficiency, but also pass through the separator to reach the positive electrode, resulting in a short circuit risk and a safety hazard
[0004] Forming a stable SEI film on the surface of the metal negative electrode by introducing electrolyte additives is an effective method to protect the metal negative electrode. However, the current additives have single functions and complex components, and some additives can also cause environmental pollution.

Method used

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  • Electrolyte for metal-sulfur secondary battery and metal-sulfur secondary battery containing electrolyte
  • Electrolyte for metal-sulfur secondary battery and metal-sulfur secondary battery containing electrolyte
  • Electrolyte for metal-sulfur secondary battery and metal-sulfur secondary battery containing electrolyte

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 12

[0032] The sulfur-containing active material in Example 12 is elemental sulfur.

Embodiment 13

[0033] The sulfur-containing active material in Example 13 is a SPAN composite material, and the specific preparation method is: mix 1.75 g of sublimated sulfur with 1 g of vulcanized polyacrylonitrile (purchased from Shanghai Macklin), and ball mill for 4 hours at a speed of 300 rpm to obtain a uniformly mixed polyacrylonitrile. powder; transfer the ball-milled mixture to a tube furnace, and heat at 350° C. for 6 h in an argon atmosphere to obtain a SPAN composite material.

Embodiment 14

[0034] The sulfur-containing active material of Example 14 is S / CoS 2Composite material, the specific preparation method is: reflux 1.2g tricobalt tetroxide (purchased from the United States sigma) and 2.25g thioacetamide (TAA) at 90°C for 10 minutes, and use a centrifuge to collect the precipitate, after drying, in an argon atmosphere Heated at 350°C for 2h to obtain CoS 2 Sulfur host. Subsequently, take 0.4g of CoS 2 Mix with 1.6g of sublimed sulfur and heat at 155°C for 10h in an argon atmosphere to obtain S / CoS 2 composite material.

[0035] Preparation of the positive electrode: Mix and grind the sulfur-containing active material, polyvinylidene fluoride and conductive carbon black according to the mass ratio of 7:1:2, and mix them uniformly in N-methylpyrrolidone (NMP) to obtain a slurry. Spread 2ml of slurry with a concentration of 0.2g / ml evenly on 60cm 2 After drying on charcoal-coated aluminum foil at 60°C for 12 hours, cut them into pole pieces with a diameter ...

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Abstract

The invention discloses an electrolyte for a metal-sulfur secondary battery and the metal-sulfur secondary battery containing the electrolyte. The electrolyte for the metal-sulfur secondary battery comprises metal salt, an organic solvent and a cerium (IV)-based additive. The cerium (IV)-based additive is one or more of cerium nitrate, cerium fluoride, cerium chloride, cerium iodide, ceric ammonium nitrate and cerium trifluoromethanesulfonate; the concentration of the metal salt in the electrolyte is 0.5-2.0 mol / L, and the addition amount of the cerium (IV)-based additive is 0.1-5 wt% of the total mass of the metal salt and the organic solvent; and the water content in the electrolyte is less than 100 ppm. The invention provides a metal-sulfur secondary battery comprising the electrolyte. The cerium (IV)-based additive in the electrolyte can effectively protect the negative electrode of the battery and ensure the stability of the negative electrode structure; and the additive can also act on a positive electrode, has good adsorption and catalysis effects on sulfur and sulfide, can effectively inhibit the shuttle effect of polysulfide, and improves the cycle performance of the battery.

Description

technical field [0001] The invention belongs to the technical field of secondary batteries, and in particular relates to an electrolytic solution for a metal-sulfur secondary battery and a metal-sulfur secondary battery containing the electrolytic solution. Background technique [0002] In recent years, lithium-ion secondary batteries have been widely used in our lives, but with the development of transportation and distributed energy storage, we still need to pursue cheaper energy storage batteries. Compared with traditional lithium-ion batteries, metal-sulfur secondary batteries have attracted much attention due to their large theoretical capacity, high energy density, and low cost, and are one of the most promising electrochemical energy storage systems. [0003] However, the practical application of metal-sulfur secondary batteries has been constrained by problems such as low capacity, fast decay, and low Coulombic efficiency. These can be attributed to the special prop...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/052
CPCH01M10/0567H01M10/052H01M2300/0091Y02E60/10
Inventor 苏利伟徐庆鸿宋昱昂吴昊王连邦
Owner ZHEJIANG UNIV OF TECH
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