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Co-HCS/CNT/S composite lithium-sulfur battery positive electrode material and preparation method thereof

A positive electrode material and composite material technology, which is applied in the field of Co-HCS/CNT/S composite lithium-sulfur battery positive electrode material and its preparation, can solve the problems of poor battery cycle life, poor rate performance, and low sulfur utilization rate, etc.

Pending Publication Date: 2021-05-11
QILU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, problems such as sulfur conductivity and the shuttle effect of soluble lithium polysulfides can lead to poor rate performance and fast capacity fading, which lead to low sulfur utilization and poor cycle life of the battery, thus greatly limiting the application of lithium-sulfur batteries. practical application

Method used

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  • Co-HCS/CNT/S composite lithium-sulfur battery positive electrode material and preparation method thereof
  • Co-HCS/CNT/S composite lithium-sulfur battery positive electrode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Example 1: A Co-HCS / CNT / S composite lithium-sulfur battery cathode material and its preparation method

[0029] Specifically include the following steps:

[0030] (1) Mix 3 mL tetrapropyl orthosilicate, 70 mL ethanol, 10 mL H 2 O and 3 mL, 5% (wt%) NH 3 ·H 2 O was stirred for 15 min; 0.4 g resorcinol, 0.56 ml, 37% wt% formaldehyde, 0.1 g PPy, 0.2 g Co(NO 3 ) 2 ·6H 2 O, stirred for 24 hours; centrifuged, washed, and dried.

[0031] The synthesis method of PPy is as follows:

[0032] 0.1 g methyl orange, 1.96 g FeCl 3 , 150 mL deionized water, 500 μL pyrrole monomer, magnetically stirred at room temperature for 24 h. Centrifuge, wash, and dry.

[0033] (2) Annealing in an argon atmosphere at 700°C for 5 hours to obtain SiO 2 @Co-HCS / CNT.

[0034] (3) SiO 2 @Co-HCS / CNT and 2 mol / L sodium hydroxide solution were mixed and allowed to stand for 36 hours, then dried after centrifugation. Co-HCS / CNT is obtained.

[0035] (4) Mix sulfur powder and Co-HCS / CNT at a m...

Embodiment 2

[0050] Example 2: A Co-HCS / CNT / S composite lithium-sulfur battery cathode material and its preparation method

[0051] Specifically include the following steps:

[0052] (1) Mix 2 mL tetrapropyl orthosilicate, 46.6 mL ethanol, 6.66 mL H 2 O and 2 mL, 5% wt% NH 3 ·H 2 O was stirred for 15 min; added 0.13 g resorcinol, 0.37 mL, 37% wt% formaldehyde, 0.2 g PPy, 0.13 g Co(NO 3 ) 2 ·6H 2 O, stirred for 24 hours; centrifuged, washed, and dried.

[0053] The synthesis method of PPy is as follows:

[0054] 0.1 g methyl orange, 1.96 g FeCl 3 , 150 mL deionized water, 500 μL pyrrole monomer magnetic stirring at room temperature for 24 hours; centrifuge, wash and dry.

[0055] (2) Annealing in an argon atmosphere at 700°C for 5 hours to obtain SiO 2 @Co-HCS / CNT.

[0056] (3) SiO2@Co-HCS / CNT and 2 moL / L sodium hydroxide solution were mixed and allowed to stand for 36 hours, then dried after centrifugation.

[0057] (4) Mix sulfur powder with Co-HCS / CNT at a mass ratio of 7:3. ...

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Abstract

The invention relates to a Co-HCS / CNT / S composite lithium-sulfur battery positive electrode material and a preparation method thereof, hollow carbon nanospheres (HCS) are attached to hollow carbon nanotubes (CNT) in the positive electrode material, and HCS is doped with Co and S and is loaded on the surface of the composite material. The preparation method comprises the following steps: (1), preparing a precursor; (2), obtaining a SiO2@Co-HCS / CNT intermediate; (3), carrying out treatment to obtain Co-HCS / CNT; and (4), obtaining the Co-HCS / CNT / S composite lithium-sulfur battery positive electrode material. Co is used as a catalyst, the oxidation-oxidation reduction reaction of a polymer can be promoted and efficient chemical adsorption of polysulfide can be provided, the loading capacity of sulfur can be improved through the special structure of HCS / CNT, meanwhile, efficient transmission of lithium ions and electrons can be provided through the special hollow structure, and the utilization rate of sulfur is improved. Further, the oxidation-reduction reaction is accelerated.

Description

technical field [0001] The invention relates to a Co-HCS / CNT / S composite lithium-sulfur battery cathode material and a preparation method thereof, belonging to the field of preparation of lithium-sulfur battery electrode materials. Background technique [0002] Traditional lithium-ion batteries are faced with the fact that their energy density cannot fully meet the growing demand for large-scale energy storage devices for new energy storage systems with high energy density. Therefore, it is imminent to optimize lithium-ion batteries and develop new batteries. Due to its high theoretical specific energy (2600Wh kg -1 ) and the advantages of low cost, wide source and non-toxicity, etc., are regarded as the new type of battery with the most potential to replace lithium-ion batteries. However, problems such as sulfur conductivity and the shuttling effect of soluble lithium polysulfides can lead to poor rate performance and fast capacity fading, which lead to low sulfur utiliz...

Claims

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Application Information

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IPC IPC(8): H01M4/04H01M4/133H01M4/134H01M4/139H01M4/36H01M4/38H01M4/62H01M10/052
CPCH01M4/0471H01M4/133H01M4/134H01M4/139H01M4/362H01M4/38H01M4/624H01M2004/028H01M10/052Y02E60/10
Inventor 任慢慢肖亭娇杨玉梅刘伟良杨铭志
Owner QILU UNIV OF TECH
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