Preparation method of gel electrolyte for lithium-sulfur battery

A gel electrolyte, lithium-sulfur battery technology, applied in secondary batteries, circuits, electrical components, etc., can solve problems such as poor conductivity, battery damage, and unsatisfactory effects, and achieves inhibition of dissolution, simple production process, and cycle performance. boosted effect

Inactive Publication Date: 2016-07-20
CHINA ELECTRONIC TECH GRP CORP NO 18 RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the shortcomings of the currently known lithium-sulfur batteries are: (1) lithium polysulfide compounds are dissolved in the electrolyte; (2) sulfur, as a non-conductive substance, has very poor conductivity, which is not conducive to the high rate performance of the battery; In the process, the expansion and contraction of the volume are very large, which may cause the battery to be damaged; in order to inhibit the dissolution of sulfur and improve the cycle performance of the battery, ether organic solvents are

Method used

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Examples

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Effect test

preparation example Construction

[0021] The preparation method of gel electrolyte for lithium-sulfur batteries is characterized in that it comprises the following preparation steps:

[0022] Step 1: Prepare ether based electrolyte

[0023] According to the total mass percentage of the prepared electrolyte, the electrolyte lithium salt is weighed in a proportion of 9-22%, the organic ether solvent is weighed in a proportion of 32-62%, and the additive is weighed in a proportion of 1-4%, and carried out at room temperature for 1 -React for 20 hours to form an ether basic electrolyte; the lithium salt of the electrolyte is one or more mixtures of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, and lithium bistrifluoromethanesulfonylimide; The organic ether solvent comprises 12-26% cyclic ethers and 20-36% chain ethers in the percentage of the total mass of the electrolyte solution, and the cyclic ethers are dioxolane ( DOL), tetrahydrofuran (THF), dimethyltetrahydrofuran (2Me-THF) o...

Embodiment 1

[0029] Step 1: Prepare ether based electrolyte

[0030] According to the ratio of 9.5% of the total mass percentage of the electrolyte solution, weigh the lithium hexafluorophosphate electrolyte lithium salt, 20% tetrahydrofuran (THF) cyclic ethers and 30% dimethoxy Methane (DMM) chain ethers are mixed to form an organic ether solvent, and 1% nickel nitrate is used as an additive according to the percentage of the total mass of the electrolyte solution; the organic ether solvent and additive are mixed into the electrolyte lithium salt, Carry out the reaction at room temperature for 10 hours to form an ether based electrolyte;

[0031] Step 2: Prepare a solution containing cross-linked polymerized monomers

[0032] Take by weighing methyl methacrylate (MMA) polymerized monomer, 6% ratio to take n-hexyl acrylate (HA) crosslinking agent according to the ratio of the total mass percentage of the electrolyte solution made, and weigh the polymerized The monomer and the cross-linki...

Embodiment 2

[0036] Step 1: Prepare ether based electrolyte

[0037] Take by weighing lithium perchlorate electrolyte lithium salt according to the percentage of the total mass percentage of the electrolyte solution that is 9.5%, dioxolane (DOL) cyclic ethers that are 20% according to the percentage of the total mass percentage of the electrolyte solution that is made Mix with 30% dimethoxyethane (DME) chain ethers to form an organic ether solvent, and be 1% cobalt nitrate as an additive according to the percentage of the total mass of the electrolytic solution made; the organic ether solvent and The additive is mixed into the electrolyte lithium salt, and reacted at room temperature for 10 hours to form an ether-based electrolyte;

[0038] Step 2: Prepare a solution containing cross-linked polymerized monomers

[0039] Take by weighing acrylonitrile (AN) polymerized monomer, 6% ratio to take n-hexyl acrylate (HA) crosslinking agent according to the ratio of the total mass percentage of t...

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Abstract

The invention relates to a preparation method of a gel electrolyte for a lithium-sulfur battery. The method comprises the following steps: 1, preparing an electrolyte lithium salt and an organic solvent into a basic electrolyte; 2, adding a mixed liquid of a polymeric monomer, a cross-linking agent and a solvent into the basic electrolyte to prepare a cross-linking polymeric liquid; 3, adding an initiator into the cross-linking polymeric liquid, performing initiated polymerization at a temperature of 15-45 DEG C for 2-6 hours to finish a preparation process of the gel electrolyte for the lithium-sulfur battery, and injecting the gel electrolyte into the lithium-sulfur battery which is being assembled. According to the preparation method, the gel electrolyte formed after initiated polymerization is put into the lithium-sulfur battery in an assembling process, and the battery has a relatively high capacity retention ratio no matter the battery is under a high temperature condition or a low temperature condition, so that high and low temperature adaptability of the lithium-sulfur battery is improved effectively; a manufacturing process of the battery is improved; and the manufacturing cost of the battery is lowered. The preparation method is suitable for large-scale commercial production of the lithium-sulfur battery.

Description

technical field [0001] The invention belongs to the technical field of lithium-sulfur batteries, in particular to a method for preparing a gel electrolyte for lithium-sulfur batteries. Background technique [0002] Lithium-sulfur battery is a kind of lithium battery. It uses sulfur as the positive electrode and lithium metal as the negative electrode. The specific capacity is as high as 1675mAh / g, which is much higher than other commercial lithium-ion battery positive materials, and sulfur is An environmentally friendly element, basically no pollution to the environment, is a very promising lithium battery. However, the shortcomings of the currently known lithium-sulfur batteries are: (1) lithium polysulfide compounds are dissolved in the electrolyte; (2) sulfur, as a non-conductive substance, has very poor conductivity, which is not conducive to the high rate performance of the battery; In the process, the expansion and contraction of the volume are very large, which may c...

Claims

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Application Information

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IPC IPC(8): H01M10/0565
CPCY02E60/10
Inventor 许寒丁飞陈振宇卢志威任丽彬李勇辉
Owner CHINA ELECTRONIC TECH GRP CORP NO 18 RES INST
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