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Lithium-sulfur battery positive electrode material and preparation method thereof

A positive electrode material, lithium-sulfur battery technology, applied in battery electrodes, lithium batteries, positive electrodes, etc., can solve the problems of limited carbon and sulfur binding force, high cost, complicated preparation process, etc., and achieve easy operation, low cost, and equipment undemanding effects

Inactive Publication Date: 2019-03-19
NANCHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current carbon preparation process is relatively complicated, the cost is high, and the binding force between carbon and sulfur is limited.

Method used

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Examples

Experimental program
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Effect test

preparation example Construction

[0024] The preparation method of lithium-sulfur battery cathode material comprises the following steps:

[0025] 1) Sieve the silkworm excrement, and ball mill the sieved silkworm excrement for 1-10 hours;

[0026] 2) Pickling the milled silkworm excrement with hydrochloric acid to remove metal impurities, the concentration of hydrochloric acid is 0.5~10mol L -1 , then washing the silkworm excrement after pickling to neutrality, and drying;

[0027] 3) put the dried silkworm excrement into a tube furnace for high-temperature carbonization, the carbonization temperature is 600-900°C, the carbonization time is 4-8h, and the carbonization gas is nitrogen or argon;

[0028] 4) The carbonized carbon material is mechanically mixed with potassium hydroxide, and the mass percentages of carbon and potassium hydroxide are respectively: 30% to 60% of carbon and 40% to 70% of potassium hydroxide; The mixture is activated at high temperature, the activation temperature is 600-800°C, the ...

Embodiment 1

[0031] 1) Sieve the silkworm excrement, and ball mill the sieved silkworm excrement for 1 hour;

[0032] 2) Pickling the silkworm excrement after ball milling with hydrochloric acid to remove metal impurities, the concentration of hydrochloric acid is 0.5molL -1 , then washing the silkworm excrement after pickling to neutrality, and drying;

[0033] 3) Put the dried silkworm excrement into a tube furnace for high-temperature carbonization, the carbonization temperature is 600°C, the carbonization time is 4h, and the carbonization gas is nitrogen;

[0034] 4) Mechanically mixing the carbonized carbon material with potassium hydroxide, the mass percentages of carbon and potassium hydroxide are respectively: 30% carbon and 70% potassium hydroxide; activate the mixture of carbon and potassium hydroxide at high temperature , the activation temperature is 600°C, the activation time is 4h, and the activation gas is argon;

[0035] 5) Wash the activated carbon to neutrality and dry,...

Embodiment 2

[0037] 1) sieving the silkworm excrement, and ball milling the sieved silkworm excrement for 10 hours;

[0038] 2) Pickling the silkworm excrement after ball milling with hydrochloric acid to remove metal impurities, the concentration of hydrochloric acid is 10mol L -1 , then washing the silkworm excrement after pickling to neutrality, and drying;

[0039] 3) Put the dried silkworm excrement into a tube furnace for high-temperature carbonization, the carbonization temperature is 900°C, the carbonization time is 8h, and the carbonization gas is argon;

[0040] 4) Mechanically mixing the carbonized carbon material with potassium hydroxide, the mass percentages of carbon and potassium hydroxide are respectively: carbon 60%, potassium hydroxide 40%; the mixture of carbon and potassium hydroxide is activated at high temperature , the activation temperature is 800°C, the activation time is 12h, and the activation gas is argon;

[0041] 5) Wash the activated carbon with water until...

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Abstract

The invention discloses a lithium-sulfur battery positive electrode material and a preparation method thereof. Specifically, the lithium-sulfur battery positive electrode material is a sulfur-carbon composite material containing porous-structured carbon with in-situ doped nitrogen and sulfur elements. The preparation method of the lithium-sulfur battery positive electrode material comprises (1) ina high-temperature inert gas atmosphere, carbonizing silkworm excrement to obtain a carbon material with in-situ doped nitrogen and sulfur elements; (2) activating the carbon material through potassium hydroxide to obtain porous carbon; (3) mixing the porous carbon with sulfur at high temperature to obtain the sulfur-carbon composite positive electrode material. According to the sulfur-carbon composite positive electrode material, the carbon and the active sulfur achieve relatively strong physical and chemical effects to effectively inhibit shuttle effects and meanwhile can improve the utilization rate and the structural stability of sulfur. The prepared lithium-sulfur battery positive electrode material is excellent in electrochemical performance and low in cost and has a broad application prospect.

Description

technical field [0001] The invention belongs to the field of lithium-sulfur battery cathode materials, and in particular relates to a lithium-sulfur battery cathode material and a preparation method thereof. Background technique [0002] Today, in order to meet the increasing energy demand of electric vehicles and energy storage systems, it is imminent to develop energy storage systems with high energy density. At present, the main energy storage system is lithium-ion battery, and its actual specific energy density does not exceed 240wh kg -1 , can no longer meet the needs of today's society for energy. Therefore, lithium-sulfur batteries with higher specific energy density have attracted extensive attention. Lithium-sulfur batteries use sulfur as the cathode material, and their theoretical specific energy density can reach 2600wh kg -1 . In addition, sulfur also has the advantages of abundant reserves, low price, and no environmental pollution. Therefore, lithium-sulfur...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/052
CPCH01M4/364H01M4/38H01M4/625H01M10/052H01M2004/028Y02E60/10
Inventor 李勇王雨
Owner NANCHANG UNIV
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