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CoSe2/hollow carbon nanosphere/S composite lithium-sulfur battery positive electrode material and preparation method thereof

A technology of positive electrode materials and composite materials, which is applied in the field of preparation of lithium-sulfur battery positive electrode materials, can solve the problems of insufficient suppression of the "shuttle effect" and the inability to firmly adsorb lithium polysulfide, so as to speed up interfacial charge transfer and be beneficial to electrochemistry. Transformational, structured effects

Active Publication Date: 2020-08-14
QILU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, nonpolar carbon materials cannot strongly adsorb lithium polysulfides due to the weak van der Waals bond energy between them.
Therefore, physisorbed carbon materials alone are not sufficient to suppress the "shuttle effect" of polysulfides under long-term cycling

Method used

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  • CoSe2/hollow carbon nanosphere/S composite lithium-sulfur battery positive electrode material and preparation method thereof
  • CoSe2/hollow carbon nanosphere/S composite lithium-sulfur battery positive electrode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] A CoSe 2 The preparation method of / hollow carbon nanosphere / S composite lithium-sulfur battery cathode material specifically comprises the following steps:

[0049] (1) Add 0.05 g of the prepared hollow carbon nanospheres to a methanol solution in which 0.1 g of cobalt nitrate hexahydrate is dissolved, the volume fraction of the methanol solution is 99.5%, the volume of the methanol solution is 60 mL, and stir at 25° C. for 24 h ;

[0050] In step (1), the preparation method of hollow carbon nanospheres comprises the following steps:

[0051] A. Add 12mL tetrapropyl orthosilicate to 280mL ethanol solution, 40mL deionized water and 12mL ammonia water mixed solution, stir at 25°C for 30min; the volume fraction of ethanol solution is 95%, and the mass percentage of ammonia water is 25-28% ;

[0052] B. Add 1.2g resorcinol and 1.8mL formaldehyde to the solution prepared in step A, and stir for 12h;

[0053] C. washing the product obtained in step B with deionized water...

Embodiment 2

[0063] A kind of CoSe provided according to embodiment 1 2 / Hollow carbon nanosphere / S composite lithium-sulfur battery positive electrode material preparation method, the difference is:

[0064] In step (1), 0.1 g of hollow carbon nanospheres were added to a methanol solution containing 0.2 g of cobalt nitrate hexahydrate, and stirred at room temperature at 25° C. for 36 h;

[0065] The preparation method of hollow carbon nanospheres comprises the following steps:

[0066] In step A, add 16mL tetrapropyl orthosilicate to the mixed solution of 290mL ethanol, 45mL deionized water and 15mL ammonia water, and stir at 25°C for 35min;

[0067] In Step B, 1.6g of resorcinol and 2.4mL of formaldehyde were added to the solution prepared in Step A, and stirred for 18h;

[0068] In step D, the carbonization temperature is 700°C, and the concentration of sodium hydroxide solution is 5mol L -1 .

[0069] In step (2), dry at 60°C;

[0070] In step (3), the temperature of the heat pres...

Embodiment 3

[0075] A kind of CoSe provided according to embodiment 1 2 / Hollow carbon nanosphere / S composite lithium-sulfur battery positive electrode material preparation method, the difference is:

[0076] In step (1), 0.15g of hollow carbon nanospheres are added to a methanol solution containing 0.3g of cobalt nitrate hexahydrate;

[0077] The preparation method of hollow carbon nanospheres comprises the following steps:

[0078] In step A, add 20mL tetrapropyl orthosilicate to the mixed solution of 300mL ethanol, 50mL deionized water and 18mL ammonia water, and stir at 25°C for 40min;

[0079] In step B, add 2.0g resorcinol and 3.0mL formaldehyde to the solution prepared in step A, and stir for 24h;

[0080]In step D, the carbonization temperature is 900°C, and the concentration of sodium hydroxide solution is 6mol L -1 .

[0081] In step (2), dry at 60°C;

[0082] In step (3), the temperature of the heat preservation is 900°C, and the time of heat preservation is 6h to obtain Co...

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Abstract

The invention relates to a CoSe2 / hollow carbon nanosphere / S composite lithium-sulfur battery positive electrode material and a preparation method thereof. The preparation method comprises the following steps: (1) adding hollow carbon nanospheres into a methanol solution dissolved with cobalt nitrate hexahydrate, and carrying out stirring; (2) carrying out washing and drying to obtain a solid product; (3) carrying out heat preservation on the obtained solid product to obtain Co / hollow carbon nanospheres; (4) uniformly mixing the obtained Co / hollow carbon nanospheres with selenium powder, and carrying out heat preservation again to obtain CoSe2 / hollow carbon nanospheres; and (5) uniformly mixing the obtained CoSe2 / hollow carbon nanospheres with sulfur powder, and carrying out heat preservation to obtain the CoSe2 / hollow carbon nanosphere / S composite material. The composite positive electrode material prepared by the invention has high cycling stability when being used as a lithium-sulfurbattery positive electrode material, and can be widely applied to the field of preparation of the lithium-sulfur battery positive electrode material; and the preparation process of the cathode material is controllable, raw materials are easy to obtain, and the cost is low.

Description

technical field [0001] The present invention relates to a CoSe 2 The invention relates to a hollow carbon nanosphere / S composite lithium-sulfur battery cathode material and a preparation method thereof, belonging to the technical field of preparation of lithium-sulfur battery cathode materials. Background technique [0002] With the growing demand for portable electronics, electric vehicles, and large-scale new energy storage technologies, the development of renewable energy storage systems is of great importance in various industries. Lithium-sulfur battery is a very representative high-energy electrochemical energy storage device, due to its extremely high theoretical energy density (about 2600Wh kg -1 ), has quickly gained attention. In addition, sulfur has the advantages of high abundance, non-toxicity, and low price, which are beneficial to the large-scale implementation of lithium-sulfur batteries. However, the dielectric properties and volume expansion of cathode m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/052C01B19/00C01B32/15
CPCH01M4/362H01M4/364H01M4/38H01M4/625H01M4/628H01M10/052C01B19/007C01B32/15H01M2004/021H01M2004/028C01P2006/40C01P2002/72Y02E60/10
Inventor 任慢慢钟文李山林杨飞苏晗刘伟良
Owner QILU UNIV OF TECH
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