Method for directly preparing liquid cathode of lithium-sulfur battery through potential control

A lithium-sulfur battery and potential control technology, applied in lithium batteries, battery electrodes, non-aqueous electrolyte batteries, etc., can solve the problems of complex chemical synthesis products, low electrochemical activity, inability to distinguish the types of synthesis products, etc., and achieve industrialization. Application, obvious beneficial effect, the effect of excellent rate performance

Active Publication Date: 2020-08-21
JIANGXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The polysulfides used in this method are chemically synthesized, the electrochemical activity is low and the situation of the ch

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Step 1, positive and negative pole pieces are prepared. The active material is sulfur powder, the conductive agent can be carbon black, the binder is PVDF, and the solvent is NMP. Slurry configuration: 80% active material, 10% binder, 10% conductive content, 50% solid solution ratio, milled with a planetary ball mill for 12 hours; spread the aluminum foil current collector on the glass surface, and use it as a tab The aluminum foil at the position is blocked by the substrate, and the coating thickness is controlled by A4 paper with a smooth scraper or a coating scraper with a spiral micrometer. The thickness of the coating scraper is 200 μm, and the surface density is 2 mg cm -2 , and then dried in a blast drying oven at 90°C, and then rolled under a pressure of 0.01 T on a roller press. The tabs were cut at one end, the length of the tab was 2 cm, the length of the pole piece was 5000 mm, and the width was 20 mm. After the positive electrode sheet is prepared, cut the...

Embodiment 2

[0022] Step 1, positive and negative pole pieces are prepared. The active material is sulfur powder, the conductive agent can be carbon black, the binder is PVDF, and the solvent is NMP. Slurry configuration: 75% of active material, 12.5% ​​of binder, 12.5% ​​of conductive material, 50% of solid solution ratio, ball milling with planetary ball mill, milling time 12 h; aluminum foil current collector spread on the glass surface, using as tab The aluminum foil part at the position is blocked by the substrate, and the coating thickness is controlled by A4 paper with a smooth scraper or a coating scraper with a spiral micrometer. The thickness of the coating scraper is 100 μm, and the surface density is 0.93 mg cm -2 , and then dried in a blast drying oven at 90°C, and then rolled under a pressure of 0.01 T on a roller press. The tabs were cut at one end, the length of the tab was 2 cm, the length of the pole piece was 5000 mm, and the width was 20 mm. After the positive electrod...

Embodiment 3

[0028] Step 1, positive and negative pole pieces are prepared. The active material is sulfur powder, the conductive agent can be carbon black, the binder is PVDF, and the solvent is NMP. Slurry configuration: 70% of active material, 15% of binder, 15% of conductive material, 45% of solid solution ratio, ball milling with planetary ball mill, milling time 10 h; The aluminum foil part at the position is blocked by the substrate, and the coating thickness is controlled by A4 paper with a smooth scraper or a coating scraper with a spiral micrometer. The thickness of the coating scraper is 100 μm, and the surface density is 0.875 mg cm -2 , and then dried in a blast drying oven at 90°C, and then rolled under a pressure of 0.01 T on a roller press, and cut into pieces leaving the tab at one end. The length of the tab is 2 cm, the length of the pole piece is 5000 mm, and the width is 20 mm. After the positive electrode sheet is prepared, cut the corresponding area according to the d...

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Abstract

The invention discloses a method for directly preparing a liquid cathode of a lithium-sulfur battery through potential control. Liquid active substances are directly prepared through potential control, and the types of the liquid active substances are subjected to reaction regulation and control of accurate potentials. The substances are directly added to a positive electrode current collector toprepare a battery pole piece for a positive electrode of the lithium-sulfur battery. The liquid active substance prepared by utilizing potential control is easy to realize uniform distribution of theliquid substance in the current collector, and the electrode prepared from the liquid active substance can enable the lithium-sulfur battery to have the advantages of high rate capability, high sulfurutilization rate, low capacity attenuation rate and the like. According to the method, the liquid active substance can be directly added to the positive electrode current collector to prepare the battery pole piece, such as a current collector selectable carbon nanotube, graphene, conductive fiber, conductive carbon cloth and the like, and the method for directly preparing the liquid positive electrode of the lithium-sulfur battery by using the potential control method is provided. The problems of non-uniform sulfur distribution, low active substance utilization rate, poor rate capability, high capacity attenuation rate and the like of an existing lithium-sulfur battery positive plate are effectively solved, the manufacturing method is simple and rapid, and large-scale commercial production is easy to realize.

Description

technical field [0001] The invention relates to a method for directly preparing a liquid positive electrode of a lithium-sulfur battery under potential control. Specifically, it belongs to a method of directly preparing the liquid active material of lithium-sulfur battery through potential control and adding it to the positive electrode as the electrode of lithium-sulfur battery, so as to improve the utilization rate, rate performance and capacity retention rate of the active material of the existing lithium-sulfur battery. technology. Background technique [0002] Since the battery was discovered in the 19th century, it has become an indispensable part of human work and life, and its role in daily life is becoming more and more important. From dry batteries, lead-acid batteries to lithium-ion batteries, batteries are also developing rapidly to meet people's growing needs; in lithium-sulfur batteries, the positive electrode material sulfur has a very high theoretical specif...

Claims

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Application Information

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IPC IPC(8): H01M4/04H01M4/139H01M10/052
CPCH01M4/0438H01M4/139H01M10/052H01M2004/028Y02E60/10
Inventor 吴子平张明罗琴王志勇胡英燕尹艳红刘先斌黎业生
Owner JIANGXI UNIV OF SCI & TECH
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