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Lithium-sulfur battery composite cathode material, and preparation method and application thereof

A composite positive electrode material and lithium-sulfur battery technology, applied in the field of electrochemistry, can solve the problems of low cycle stability and capacity retention, low sulfur loading of composite materials, and poor stability of finished products, so as to improve cycle stability and capacity retention efficiency, enhanced dissolution and diffusion, and increased electronic and ionic conductivity

Active Publication Date: 2015-02-18
SOUTH CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The currently reported products and preparation methods of lithium-sulfur battery composite positive electrode materials have some shortcomings, such as low sulfur loading of composite materials, poor electronic conductivity leading to low cycle stability and low capacity retention, and the existing process is relatively complicated and costly. High, the stability of the finished product is poor

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  • Lithium-sulfur battery composite cathode material, and preparation method and application thereof
  • Lithium-sulfur battery composite cathode material, and preparation method and application thereof
  • Lithium-sulfur battery composite cathode material, and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0060] A kind of multi-walled carbon nanotube / sulfur composite material, its preparation method is as follows:

[0061] (1) Add 4g of raw material multi-walled carbon nanotubes into 400mL of mixed acid of concentrated nitric acid and concentrated sulfuric acid (volume ratio of concentrated nitric acid and concentrated sulfuric acid: 3:1), sonicate for 2h, heat and reflux in an oil bath at 100°C for 6h, and filter , washed with deionized water until neutral, and vacuum-dried at 100°C to obtain purified multi-walled carbon nanotubes;

[0062] (2) Weigh 0.5 g of purified multi-walled carbon nanotubes and disperse them in 100 mL of deionized water for 8 h, then add 3.87 g of sodium thiosulfate pentahydrate and 5 mL of cetyltrimethylammonium bromide solution with a concentration of 5 wt%. , accompanied by vigorous stirring; use 19 mL of dilute hydrochloric acid with a concentration of 2 mol / L to titrate the reaction for 2 hours, the titration rate is controlled at 30-40 drops per m...

Embodiment 2

[0066] A kind of multi-walled carbon nanotube / sulfur composite material, its preparation method is as follows:

[0067] (1) Add 4g of raw material multi-walled carbon nanotubes into 400mL of mixed acid of concentrated nitric acid and concentrated sulfuric acid (volume ratio of concentrated nitric acid and concentrated sulfuric acid: 3:1), sonicate for 2h, heat and reflux in an oil bath at 100°C for 6h, and filter , washed with deionized water until neutral, and vacuum-dried at 100°C to obtain purified multi-walled carbon nanotubes;

[0068] (2) Weigh 0.5g of purified multi-walled carbon nanotubes and disperse them in 100mL of deionized water for 8h, then add 5.81g of sodium thiosulfate pentahydrate and 6mL of 5wt% cetyltrimethylammonium bromide solution , accompanied by vigorous stirring; use 28 mL of dilute hydrochloric acid with a concentration of 2 mol / L to titrate the reaction for 2 hours, the titration rate is controlled at 30-40 drops per minute, filter after the reactio...

Embodiment 3

[0072] A kind of multi-walled carbon nanotube / sulfur composite material, its preparation method is as follows:

[0073] (1) Add 4g of raw material multi-walled carbon nanotubes into 400mL of mixed acid of concentrated nitric acid and concentrated sulfuric acid (volume ratio of concentrated nitric acid and concentrated sulfuric acid: 3:1), sonicate for 2h, heat and reflux in an oil bath at 100°C for 6h, and filter , washed with deionized water until neutral, and vacuum-dried at 100°C to obtain purified multi-walled carbon nanotubes;

[0074] (2) Weigh 0.5 g of purified multi-walled carbon nanotubes and disperse them in 100 mL of deionized water for 8 h, then add 9.03 g of sodium thiosulfate pentahydrate and 7 mL of cetyltrimethylammonium bromide solution with a concentration of 5 wt%. , accompanied by vigorous stirring; use 44 mL of dilute hydrochloric acid with a concentration of 2 mol / L to titrate the reaction for 2 hours, the titration rate is controlled at 30-40 drops per m...

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Abstract

The invention belongs to the field of electrochemistry and discloses multiwalled carbon nanotube / sulphur / polyaniline composite cathode material, a preparation method thereof, and the application thereof to the preparation of lithium sulphur batterypositive plates. The material adopts multiwalled carbon nanotube / sulphur / polyaniline composite cathode material and a sandwich structure; multiwalled carbon nanotube / sulphur composite material is coated with conductive polyaniline through in-situ polymerization, so that the multiwalled carbon nanotube / sulphur / polyaniline composite cathode material is formed; the multiwalled carbon nanotube / sulphur composite material is prepared through chemical co-deposition. The method is simple in technology, low in cost and high in consistency and stability of products. The material is high in electronic and ionic conductivity and high in sulphur carrying capacity, and can be applied to the preparation of lithium battery composite positive plates; the positive plate is high in cycling stability and capacity retention ratio.

Description

technical field [0001] The invention belongs to the field of electrochemistry, and relates to a lithium-sulfur battery composite positive electrode material, in particular to a multi-walled carbon nanotube / sulfur / polyaniline composite positive electrode material and a preparation method thereof, and its application in preparing lithium-sulfur battery positive electrode sheets . Background technique [0002] With the widespread popularization of portable electronic products, the rapid development of energy storage technology and electric vehicles, the traditional lithium-ion batteries (using transition metal oxides as positive electrodes, graphite as negative electrodes, lithium hexafluorophosphate and traditional carbonates as electrolytic The energy density and power density of liquid) put forward higher and higher requirements. Since elemental sulfur has a high theoretical specific capacity of 1672mAh / g, when assembled with metal lithium to form a battery, the theoretical...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36
CPCH01M4/364Y02E60/10
Inventor 李小岗饶睦敏陈东瑞林海斌刘燕林廖友好邢丽丹李伟善
Owner SOUTH CHINA NORMAL UNIVERSITY
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