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Preparation method of sulfur/sisal fiber charcoal lithium ion battery composite negative electrode material

A technology for lithium-ion batteries and negative electrode materials, applied in battery electrodes, circuits, electrical components, etc., can solve problems such as poor conductivity, poor electrochemical properties of materials, and unfavorable electron transport, achieving high specific capacity, excellent electrochemical performance, good cycle stability

Inactive Publication Date: 2018-02-23
GUILIN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the conductivity of elemental sulfur is poor, which is not conducive to the transport of electrons, resulting in poor electrochemical performance of the material.

Method used

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  • Preparation method of sulfur/sisal fiber charcoal lithium ion battery composite negative electrode material
  • Preparation method of sulfur/sisal fiber charcoal lithium ion battery composite negative electrode material
  • Preparation method of sulfur/sisal fiber charcoal lithium ion battery composite negative electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] (1) Sulfuric acid and sodium thiosulfate pentahydrate were configured into sulfuric acid solution and sodium thiosulfate solution with a concentration of 2 mol / L respectively with deionized water.

[0021] (2) The cleaned sisal fiber is cut into 2-3 centimeter segments, weighs 5 g and puts it into the polytetrafluoroethylene lining of the autoclave, and takes 35 mL of the two solutions of step (1) with a graduated cylinder Pour it into the lining of the above reaction kettle in turn, then ultrasonically oscillate for 30 minutes, then place the lining in the reaction kettle, cover the reaction kettle tightly, and conduct a hydrothermal reaction in a closed reaction kettle for 12 hours at a reaction temperature of 120°C. After the reaction is completed Wash the black product with water until neutral, and dry it in a vacuum oven at 50°C.

[0022] (3) The black product dried in step (2) was calcined for 0.5 hour under a nitrogen atmosphere with a gas flow rate of 50ml / min, ...

Embodiment 2

[0027] (1) Sulfuric acid and sodium thiosulfate pentahydrate were configured into sulfuric acid solution and sodium thiosulfate solution with a concentration of 2 mol / L respectively with deionized water.

[0028] (2) The cleaned sisal fiber is cut into 2-3 centimeter segments, weighs 5 g and puts it into the polytetrafluoroethylene lining of the autoclave, and takes 35 mL of the two solutions of step (1) with a graduated cylinder Pour it into the lining of the above reaction kettle in turn, then ultrasonically oscillate for 30 minutes, then place the lining in the reaction kettle, cover the reaction kettle tightly, and conduct a hydrothermal reaction in a closed reaction kettle for 12 hours at a reaction temperature of 140°C. After the reaction is completed Wash the black product with water until neutral, and dry it in a vacuum oven at 50°C.

[0029] (3) The black product dried in step (2) was calcined for 0.5 hour under a nitrogen atmosphere with a gas flow rate of 50ml / min, ...

Embodiment 3

[0032] (1) Sulfuric acid and sodium thiosulfate pentahydrate were configured into sulfuric acid solution and sodium thiosulfate solution with a concentration of 2 mol / L respectively with deionized water.

[0033] (2) The cleaned sisal fiber is cut into 2-3 centimeter segments, weighs 5 g and puts it into the polytetrafluoroethylene lining of the autoclave, and takes 35 mL of the two solutions of step (1) with a graduated cylinder Pour it into the lining of the above reaction kettle in turn, then ultrasonically vibrate for 30 minutes, then put the lining in the reaction kettle, cover the reaction kettle tightly, and react hydrothermally in the closed reaction kettle for 12 hours, the reaction temperature is 160°C, after the reaction is completed Wash the black product with water until neutral, and dry it in a vacuum oven at 50°C.

[0034] (3) The black product dried in step (2) was calcined for 0.5 hour under a nitrogen atmosphere with a gas flow rate of 50ml / min, the calcining...

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Abstract

The invention discloses a preparation method of a sulfur / sisal fiber charcoal lithium ion battery composite negative electrode material. The method comprises the following steps: (1) deionized water is used for respectively preparing acid and sodium thiosulfate pentahydrate into an acid solution and a sodium thiosulfate solution whose concentrates are 1-2mol / L; (2) sisal fiber is cut into small segments of 2-3 centimetres, sisal and the two solutions in the step (1) are mixed, then ultrasonic concussion is carried out for 25-35 minutes, a hydrothermal reaction is carried out for 12-16 hours, reaction temperature is 120-200 DEG C, washing with water is carried out till the solution is neutral, and drying is carried out; (3) calcination is carried out in an inert gas atmosphere whose gas flow is 20-100ml / min for 0.5-2 hours, heating rate of calcination is 1-10 DEG C / min, natural cooling is carried out to room temperature, and the sulfur / sisal fiber charcoal lithium ion battery compositenegative electrode material is obtained. The method has the advantages of low raw material cost, green and environmental protection, and simple preparation technology; and a new approach is provided for preparation of the lithium ion battery negative electrode material.

Description

technical field [0001] The invention relates to a preparation method of a sulfur / sisal charcoal (S / SFC) lithium ion battery composite negative electrode material. Background technique [0002] In today's society, with the decrease of non-renewable resources, the development and utilization of new energy has become an important way to achieve sustainable development. Lithium-ion batteries are favored for their high energy density, high power density, and good safety, and their application fields continue to expand. They are not only used in small electronic devices, but also in the direction of power batteries in recent years. In the manufacturing cost of lithium-ion batteries, electrode materials account for the highest proportion, reaching 50-60%, and the electrode materials inside the battery control the electrochemical reactions of the entire battery. Therefore, electrode materials, as the core of lithium-ion batteries, have always been one of the key factors restricting...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38
CPCH01M4/364H01M4/38Y02E60/10
Inventor 覃爱苗张改革杜锐张帅帅
Owner GUILIN UNIVERSITY OF TECHNOLOGY
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