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Binder for lithium-sulfur battery and application of binder

A lithium-sulfur battery and binder technology, which is applied in lithium batteries, battery electrodes, non-aqueous electrolyte batteries, etc., can solve the problems of poor cycle performance of lithium-sulfur batteries, reduce agglomeration, shorten transmission distance, and ensure stability Effect

Active Publication Date: 2016-01-06
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem of poor cycle performance of lithium-sulfur batteries, the invention provides a binder for lithium-sulfur batteries and its application

Method used

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  • Binder for lithium-sulfur battery and application of binder
  • Binder for lithium-sulfur battery and application of binder
  • Binder for lithium-sulfur battery and application of binder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] a The gelatin was heated and stirred in deionized water for 1 h, the concentration of the gelatin aqueous solution was 3 wt %, and the heating temperature was 70° C. to obtain the gelatin aqueous solution.

[0035] b. Heat and stir polyvinyl alcohol (PVA) in deionized water for 3 hours, the concentration of the crosslinking agent aqueous solution is 10 wt %, and the heating temperature is 80° C. to obtain the PVA aqueous solution.

[0036] c. Heat and stir the starch in deionized water for 0.2 h, the concentration of the starch aqueous solution is 1%, and the heating temperature is 70° C. to obtain the starch aqueous solution.

[0037] d Add the cross-linking agent aqueous solution and starch aqueous solution to the prepared gelatin aqueous solution while heating and stirring, the mass ratio of cross-linking agent, starch, and gelatin is 10:2:1, the heating temperature is 80°C, and the stirring time is 2h. A mixed aqueous solution of the crosslinking agent gelatin starc...

Embodiment 2

[0044] a The gelatin was heated and stirred in deionized water for 1 h, the concentration of the gelatin aqueous solution was 3 wt %, and the heating temperature was 70° C. to obtain the gelatin aqueous solution.

[0045] b. Heat and stir polyvinyl alcohol (PVA) in deionized water for 3 hours, the concentration of the crosslinking agent aqueous solution is 10 wt %, and the heating temperature is 80° C. to obtain the PVA aqueous solution.

[0046] c. Heat and stir the starch in deionized water for 0.2 h, the concentration of the starch aqueous solution is 1%, and the heating temperature is 70° C. to obtain the starch aqueous solution.

[0047] d Add the crosslinking agent aqueous solution and starch aqueous solution to the prepared gelatin aqueous solution while heating and stirring, the mass ratio of crosslinking agent, starch, and gelatin is 15:3:2, the heating temperature is 80°C, and the stirring time is 2h. A mixed aqueous solution of the crosslinking agent gelatin starch ...

Embodiment 3

[0054] a The gelatin was heated and stirred in deionized water for 1 h, the concentration of the gelatin aqueous solution was 3 wt %, and the heating temperature was 70° C. to obtain the gelatin aqueous solution.

[0055] b. Heat and stir polyvinyl alcohol (PVA) in deionized water for 3 hours, the concentration of the crosslinking agent aqueous solution is 10 wt %, and the heating temperature is 80° C. to obtain the PVA aqueous solution.

[0056] c. Heat and stir the starch in deionized water for 0.2 h, the concentration of the starch aqueous solution is 1%, and the heating temperature is 70° C. to obtain the starch aqueous solution.

[0057] d Add the crosslinking agent aqueous solution and starch aqueous solution to the prepared gelatin aqueous solution while heating and stirring, the mass ratio of crosslinking agent, starch, and gelatin is 30:6:5, the heating temperature is 80°C, and the stirring time is 2h. A mixed aqueous solution of the crosslinking agent gelatin starch ...

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Abstract

The invention relates to a binder for a lithium-sulfur battery and an application of the binder. With gelatin and starch as the binder and hydrogel as a cross-linking agent, a lithium-sulfur battery electrode having a three-dimensional space mesh structure with mesoporous ducts is prepared. According to the prepared binder, the problems that the volume of the sulfur electrode expands, a plurality of intermediate products are generated during battery charging and discharging processes, the intermediate product lithium polysulfide (Li2Sx, x is less than or equal to 8 and greater than or equal to 4) is easily dissolved into organic electrolyte, and the shuttle effect is easy to generate can be solved. Therefore, the problem of relatively poor cyclicity of the lithium-sulfur battery can be solved.

Description

technical field [0001] The invention relates to a binder for lithium-sulfur batteries, belonging to the technical field of energy materials. technical background [0002] Nowadays, problems such as environmental pollution, greenhouse effect, and energy crisis are becoming more and more serious in the world. Secondary batteries with high specific energy are of great significance for solving outstanding energy and environmental problems. Among them, the lithium-ion battery is one of the batteries with the highest specific energy in the secondary battery. However, in the lithium-ion secondary battery system, the specific capacity and cycle performance of the cathode material need to be further optimized. Traditional cathode materials such as LiCoO 2 / Graphite and LiFePO 4 The theoretical energy density of the / graphite system is about 400Wh / kg. Due to the limitation of its theoretical energy density, it is determined that even if the composition and process of these catho...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M10/052
CPCY02E60/10
Inventor 马艺文张华民张洪章
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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