Preparation method of lithium sulphur battery anode material with high power and high specific capacity

A high specific capacity, high power technology, applied in the direction of battery electrodes, circuits, electrical components, etc., to achieve the effects of high discharge specific capacity, high power density, and simple chemical process

Inactive Publication Date: 2012-10-03
GUANGZHOU HKUST FOK YING TUNG RES INST
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the content of sulfur in the composite material is not high, generally less than 80%, which reduces the overall capacity of the lithium-sulfur battery, and the high-rate charge and discharge performance needs to be improved (≥2C; 1C=1675mAhg-1 ), and it is difficult to achieve industrial production

Method used

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  • Preparation method of lithium sulphur battery anode material with high power and high specific capacity
  • Preparation method of lithium sulphur battery anode material with high power and high specific capacity
  • Preparation method of lithium sulphur battery anode material with high power and high specific capacity

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The first step is to mix 70 milliliters of concentrated sulfuric acid, 4 milliliters of concentrated nitric acid and 3 grams of graphite, stir for 0.5 hours at 0 degrees, and the stirring speed is 300 rpm; then add 9 grams of potassium permanganate , the solution temperature rose to 35 degrees, stirred for 0.5 hours, and the stirring speed was 1000 rpm; then added 200 milliliters of water, the solution temperature rose to 80 degrees, and continued to stir for 0.5 hours; then added 300 milliliters of water and 15 milliliters of concentration 30% hydrogen peroxide, the solution was lowered to normal temperature, and continued to stir for 0.3 hours; then filtered and washed until the pH value of the solution was 5, after ultrasonication and centrifugation, a graphene oxide solution was obtained, and the frequency of oxidation ultrasonic was 20KHz, The ultrasonic time was 1 hour, and the centrifugation speed was 5000 rpm.

[0024] In the second step, 20 ml of hydrochloric a...

Embodiment 2

[0028] The first step The preparation method is basically the same as the first step in Example 1, except that the graphite is 2 grams, and the ultrasonic frequency is 60KHz.

[0029] In the second step, 50 ml of citric acid solution with a concentration of 1M was gradually added dropwise to 200 ml of 0.5M sodium thiosulfate solution, and after stirring at a speed of 600 rpm for 10 minutes, 5 ml of citric acid solution with a concentration of 3% The mixed active agent of urea and Triton TX-100 was slowly added dropwise into the solution, the temperature of the solution was raised to 70 degrees, and then 20 milliliters of graphene oxide solution with a concentration of 1 mg / ml was added. The temperature of the solution was raised to 90 degrees, stirred and heated for 2 hours, and then the product was filtered, washed, and dried to obtain a composite of graphene-coated sulfur particles.

[0030] The third step The preparation method is the same as the third step in Example 1.

Embodiment 3

[0032] The first step preparation method is basically the same as the first step in Example 1, the difference is that the graphene is 1 gram, then add 9 grams of potassium permanganate, the solution temperature rises to 35 degrees, stir for 1 hour, add 15 ml The concentration is 30%, the pH value of the solution is 6, and the centrifugation rate is 12000 rpm.

[0033]In the second step, 10 milliliters of concentrated phosphoric acid was gradually added dropwise to 200 milliliters of 0.5M ammonium thiosulfate solution, and after stirring at a speed of 1000 rpm for 1 minute, 5 milliliters of 3% urea and Qula The mixed active agent through TX-100 was slowly added dropwise into the solution, the temperature of the solution was raised to 70 degrees, and then 20 milliliters of graphene oxide solution with a concentration of 1 mg / ml was added. The temperature of the solution was raised to 90 degrees, stirred and heated for 0.5 hours, and then the product was filtered, washed, and dri...

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Abstract

The invention discloses a preparation method of a lithium sulphur battery anode material with high power and high specific capacity, belonging to the field of material chemistry. According to the invention, an active agent is taken as a medium, and a graphene-coated sulphur particle compound is prepared with a simple chemical method. The preparation comprises the following steps of: (1) preparation of graphene oxide; and (2) synthesis of the graphene-coated sulphur particle compound. The preparation method disclosed by the invention has the characteristics of simple process, convenience for operation, excellent material performance and the like, and is suitable for large-scale industrialized production. The graphene-coated sulphur particle compound prepared according to the invention has the advantages of high sulphur contant, large discharge specific capacity, high power density, good cyclic performance and the like, and has a wide application prospect in relevant fields such as portable electronic devices, electric vehicles and energy storage.

Description

technical field [0001] The invention relates to a method for preparing a high-power, high-specific-capacity lithium-sulfur battery positive electrode material, in particular to a method for preparing a graphene-coated sulfur particle composite through a simple chemical method using an active agent as a medium, which belongs to material chemistry field. Background technique [0002] With the rapid development of related fields such as portable electronics, electric vehicles, and energy storage, the performance of batteries is increasingly required. Therefore, it is of great strategic significance to develop new lithium-ion secondary batteries with high performance, low cost and environmental friendliness. At present, the performance of cathode materials is restricting the development of lithium-ion batteries, such as LiFePO4, LiMn2O4 and ternary materials. Due to the limitation of their low theoretical capacity, it is difficult to improve. Therefore, the development of new...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38
CPCY02E60/12Y02E60/10
Inventor 徐辉陈国华施志聪邓远富
Owner GUANGZHOU HKUST FOK YING TUNG RES INST
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