Polar sulfide-sulfur/porous carbon composite positive electrode material with three-dimensional structure and preparation method of positive electrode material

A three-dimensional structure and composite material technology, applied in structural parts, positive electrodes, battery electrodes, etc., can solve the problems of poor structural stability, low conductivity, and low cycle stability of positive electrode materials

Active Publication Date: 2019-03-01
CHINA UNIV OF GEOSCIENCES (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to provide a polar sulfide-sulfur / porous carbon composite positive electrode material with a three-dimensional structure and its preparation method to solve the problem of poor structural stability, low electrical conductivity, and cycle problems of the existing positive electrode materials in lithium-sulfur batteries. low stability issues

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Raw materials: Sulfur powder is a commercially available industrial raw material, sublimated sulfur, and the purity requirement is greater than 99.99%; tin powder is a commercially available industrial raw material, and the purity requirement is greater than 99.99%.

[0012] Weigh the sulfur powder and tin powder in the above raw materials in proportion, grind them in a mortar for 30 minutes, put the mixed powders into a reaction kettle, and react at 250°C for 12 hours.

[0013] Grind the reacted mixture, add a certain proportion of glucose solution, put it into a freeze dryer at a freezing temperature of -60°C, freeze for 24 hours, and dry for 24 hours.

[0014] Put the three-dimensional structure precursor obtained by freeze-drying into a crucible. The crucible is sealed with a slurry composed of feldspar, quartz and clay, and protected by argon in a tube furnace. The heating temperature is 800°C and the reaction time is 12 hours. A three-dimensional structural tin su...

Embodiment 2

[0017] raw material:

[0018] Sulfur powder is a commercially available industrial raw material, sublimated sulfur, and the purity requirement is greater than 99.99%.

[0019] Indium powder is a commercially available industrial raw material, and the purity requirement is greater than 99.99%.

[0020] The sulfur powder and indium powder in the above raw materials were weighed in proportion and ground in a mortar for 30 minutes, and the mixed powder was put into a reaction kettle, and reacted at 180° C. for 12 hours.

[0021] Grind the reacted mixture, add a certain proportion of glucose solution, put it into a freeze dryer at a freezing temperature of -60°C, freeze for 24 hours, and dry for 24 hours.

[0022] Put the three-dimensional structure precursor obtained by freeze-drying into a crucible. The crucible is sealed with a slurry composed of feldspar, quartz and clay, and protected by argon in a tube furnace. The heating temperature is 600°C and the reaction time is 12 hou...

Embodiment 3

[0024] raw material:

[0025] Sulfur powder is a commercially available industrial raw material, sublimated sulfur, and the purity requirement is greater than 99.99%.

[0026] Bismuth powder is a commercially available industrial raw material, and the purity requirement is greater than 99.99%.

[0027] The sulfur powder and bismuth powder in the above raw materials were weighed in proportion and ground in a mortar for 30 minutes, and the mixed powder was put into a reaction kettle, and reacted at 300° C. for 18 hours.

[0028] Grind the reacted mixture, add a certain proportion of glucose solution, put it into a freeze dryer at a freezing temperature of -60°C, freeze for 24 hours, and dry for 24 hours.

[0029] Put the three-dimensional structure precursor obtained by freeze-drying into a crucible. The crucible is sealed with a slurry composed of feldspar, quartz and clay, and protected by argon in a tube furnace. The heating temperature is 700°C and the reaction time is 18 h...

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Abstract

The invention discloses a polar sulfide-sulfur/porous carbon composite positive electrode material with a three-dimensional structure and a preparation method of the positive electrode material, and belongs to the technical field of preparation of lithium-sulfur batteries. The polar sulfide-sulfur/porous carbon composite positive electrode material is characterized in that the polar sulfide-sulfur/porous carbon composite positive electrode material with the three-dimensional structure is designed by taking porous carbon with high conductivity and physical absorption as a framework and combining a polar metal sulfide formed in situ with the strong chemical adsorption characteristic. The three-dimensional polar sulfide-sulfur/porous carbon composite positive electrode material is controllably prepared through low-temperature co-melting, uniform mixing, freeze-drying, in-situ carbonization and sulfuration and other steps, an assembled lithium-sulfur battery has stable electrochemical performance, the positive electrode material can be used for the lithium-sulfur battery and will also lay a foundation for the development and application of a novel high-performance lithium-sulfur battery positive electrode material.

Description

technical field [0001] The invention relates to the technical field of lithium-sulfur battery preparation, in particular to a polar sulfide-sulfur / porous carbon composite cathode material with a three-dimensional structure and a preparation method thereof. Background technique [0002] Under the urgent need to develop new energy and energy storage technologies in today's world, the development of low-cost, high-energy-density lithium batteries has become one of the important goals of energy development in countries around the world. The theoretical specific capacity of elemental sulfur is 1675mA·g -1 , the energy density of the lithium-sulfur battery composed of metal lithium as the negative electrode material is as high as 2600Wh kg -1 , is considered to be an ideal green high-energy battery system. Although lithium-sulfur batteries have many advantages, they still face many problems in practical applications. For example, elemental sulfur in the discharged state and lith...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/052
CPCH01M4/362H01M4/38H01M4/625H01M4/628H01M10/052H01M2004/021H01M2004/028Y02E60/10
Inventor 于天阳闵鑫赵雅静孙彬房明浩黄朝晖刘艳改吴小文刘因儒陈智明张天宇
Owner CHINA UNIV OF GEOSCIENCES (BEIJING)
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