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s@m x sns y @c Composite cathode active materials and their preparation and application in lithium-sulfur batteries

A lithium-sulfur battery and composite positive electrode technology, which is applied in the direction of lithium batteries, active material electrodes, positive electrodes, etc., can solve the problems of capacity loss, poor conductivity, etc., and achieve the effect of improving capacity, improving conductivity, and improving cycle stability

Active Publication Date: 2021-04-13
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to overcome the disadvantages of poor electrical conductivity in the positive electrode material of lithium-sulfur batteries in the prior art, and the shuttle effect caused by the dissolution and diffusion of the discharge product lithium polysulfide will cause capacity loss and cycle attenuation, the first purpose of the present invention is to provide a lithium-sulfur battery Battery S@M x SnS y @C composite cathode active material, designed to effectively prevent the dissolution of polysulfides in the electrolyte, accelerate the conversion rate of polysulfides, improve the utilization of sulfur, and improve the performance of lithium-sulfur batteries

Method used

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  • s@m <sub>x</sub> sns <sub>y</sub> @c Composite cathode active materials and their preparation and application in lithium-sulfur batteries
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  • s@m <sub>x</sub> sns <sub>y</sub> @c Composite cathode active materials and their preparation and application in lithium-sulfur batteries

Examples

Experimental program
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Effect test

Embodiment 1

[0074](1) 0.5 mmol 5 hydrazine tin solution was dissolved in 5 ml of ethanol, and 30 ml of stirring was added to aqueous solution containing 0.5 mmol of cobalt cobalt cobalt and 0.5 mmol sodium citrate, then dripping sodium hydroxide. The solution was carried out, and the alkali concentration in the co-precipitation reaction was controlled to 1 m; the mixture was added to 0.5 h after 0.5 h, the etching reaction was carried out, and the concentration of the base during the control reaction was 9m. After 20 min, the reaction product was filtered, washed, washed in a drying tank at 80 ° C for 6 h, resulting in hollow COSN (OH)6Nano cube;

[0075](2) Take 0.4g CoSN (OH)6Dispersed in 50 ml of deionized water, then 1.5 g pdda, 0. 32 g of Tris and 0.14 g of sodium chloride were added, stirred for 120 min, then washed 3 times with deionized water to remove excess PDDA, and will carry a positively charged COSN (OH)6The nano block was added to an oxide solution having a concentration of 2 mg / m...

Embodiment 2

[0080](1) Take 1.5 mmol of pentahydrochloride in 5 ml of ethanol, add 30 ml of 30 ml of cobalt-containing cobalt-containing cobalt and 1.5 mmol, then drip sodium hydroxide. The solution was carried out, and the alkali concentration in the co-precipitation reaction was controlled; the mixture was added to 1.5 h, and a higher concentration of sodium hydroxide solution was added, the etching reaction was carried out, and the concentration of the base during the control reaction was 11m. After 40 min, the reaction product was filtered, washed, and then dried in a drying tank at 80 ° C for 6 h, resulting in a hollow COSN (OH) 6 nano cube;

[0081](2) 0.4 g of COSN (OH) 6 was dispersed in 50 ml of deionized water, then 2.5 g pdda, 0. 4 g of Tris and 0.18 g of sodium chloride were added, stirred for 120min, then washed 3 times with deionized water to remove excess PDDA , Then take positively charged COSN (OH)6The nano block was added to a graphene solution having a concentration of 4 mg / ml,...

Embodiment 3

[0086](1) Take 1 mmol of penthyfrobinated tin solution in 5 ml of ethanol, dripping 30 ml of 30 ml of 1 mmol hexaloride and 1 mmol of cobalt cobalt citrate, then dripped sodium hydroxide solution, The coprecipitation reaction, the alkali concentration in the coprecipitation reaction is 2 m; the stirring reaction is added to 1 h after 1 h, the etching reaction is carried out, the concentration of the base during the control reaction is 9m, and the reaction is 30 min, The reaction product was filtered, washed, placed in a drying tank at 80 ° C for 6 h, resulting in hollow COSN (OH)6Nano cube;

[0087](2) Take 0.4g CoSN (OH)6Diered in 50 ml of deionized water, then 2 g pdda, 0.3 6 g of Tris and 0.16 g of sodium chloride were added, stirred for 120min, then wash 3 times with deionized water to remove excess PDDA, and will carry positively charged COSN (OH)6The nanotum was added to a graphene solution of 20 ml of concentration of 3 mg / ml, stirred for 10 min, and the dry and dry, cosn (OH)...

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Abstract

The invention belongs to the technical field of lithium-sulfur batteries, and specifically discloses a lithium-sulfur battery S@M x SnS y @C Composite positive electrode active material, which includes an inner shell with a filling chamber and a conductive carbon shell coated on its outer surface; and the filling chamber of the inner shell is filled with elemental sulfur; the inner shell The material is M x SnS y ; x is 0.5-1.7; said y is 3.2-5.8. The invention also provides the preparation method of coprecipitation, etching, vulcanization, electrostatic coating and sulfur loading of the composite positive electrode active material. The material of the present invention has good conductivity and sulfur-fixing effect, and can also undergo redox reactions with polysulfides to effectively catalyze the conversion of polysulfides, reduce the concentration of polysulfides in the electrolyte, and improve the utilization rate of sulfur . When applied to the positive electrode of lithium-sulfur batteries, the electrochemical performance of lithium-sulfur batteries can be significantly improved under the action of sulfur fixation and catalysis.

Description

Technical field[0001]The present invention belongs to the technical field of battery, and more particularly to a method for preparing a bimetalline sulfide modified carbon material for a lithium sulfur battery.Background technique[0002]With the rapid development of the global economy, human demand for energy is increasing. Excessive use of fossil energy has also caused concerns about future energy supply and brought serious environmental pollution. In this context, clean renewable energy such as solar energy, tidal energy, biomass, wind energy, has been vigorously developed, but these energy is intermittent, uncontrolled, and requires electrochemical energy storage system to convert to stable electricity. Can be used. On the other hand, with the rapid development of new energy vehicles, laptops, mobile phones, and drones, the market of electrochemical energy storage devices is getting bigger and bigger. Therefore, it is important to develop electrochemical energy storage devices for...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M4/13H01M10/052
CPCH01M4/13H01M4/366H01M4/38H01M4/625H01M4/628H01M10/052H01M2004/021H01M2004/028Y02E60/10
Inventor 唐晶晶周向阳杨娟李亮许和荣宋润峰侯林沈丽高辛龙
Owner CENT SOUTH UNIV
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