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Nano-bracelet ferric oxide/graphene quantum dot/stannic oxide core-shell structure composite material, preparation method thereof, and battery application of same

A graphene quantum dot, ferric oxide technology, applied in the direction of iron oxide/iron hydroxide, tin oxide, iron oxide, etc., can solve the problems of poor cycle performance, inability to adapt to demand, loss of active materials, etc.

Active Publication Date: 2021-05-18
ANHUI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Due to the advantages of lithium-sulfur batteries, there are many studies in this direction, but sulfur has poor conductivity, high volume expansion during charge-discharge cycles, and the reaction process is due to the intermediate product lithium polysulfide (Li 2 S n , 4≤n≤8) dissolution and deposition lead to serious shuttling effect, etc. These problems lead to low Coulombic efficiency, poor cycle performance and loss of active materials in lithium-sulfur batteries
This limits the production and use of lithium-sulfur batteries and cannot meet the needs of real life.

Method used

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  • Nano-bracelet ferric oxide/graphene quantum dot/stannic oxide core-shell structure composite material, preparation method thereof, and battery application of same
  • Nano-bracelet ferric oxide/graphene quantum dot/stannic oxide core-shell structure composite material, preparation method thereof, and battery application of same
  • Nano-bracelet ferric oxide/graphene quantum dot/stannic oxide core-shell structure composite material, preparation method thereof, and battery application of same

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] The preparation method of nano-bracelet ferric oxide / graphene quantum dot / tin dioxide core-shell structure composite material comprises the following steps:

[0055] 1) Add 0.35g of ferric chloride to 35ml of deionized water, then add 0.002g of sodium sulfate and 0.001g of sodium dihydrogen phosphate, mix and stir evenly, then transfer the solution to a polytetrafluoroethylene liner for hydrothermal reaction, set Set the temperature at 170°C and maintain it for 24 hours. After cooling to room temperature, wash and dry to obtain ferric oxide nano bracelet;

[0056] 2) Disperse 0.12g of ferric oxide nano-bracelet obtained in step 1) in 28ml of water, then add 6ml, 1mg / ml concentration of commercial graphene quantum dot solution, ultrasonically until the solution is uniform, transfer the solution to polytetrafluoroethylene The gallbladder was subjected to hydrothermal reaction, set the temperature at 160°C, and maintained for 8 hours. After the solution was cooled, it was ...

Embodiment 2

[0060] The preparation method of nano-bracelet ferric oxide / graphene quantum dot / tin dioxide core-shell structure composite material comprises the following steps:

[0061] 1) Add 0.25g of ferric chloride, 0.0026g of sodium sulfate, and 0.00125g of sodium dihydrogen phosphate into 30ml of deionized water, mix and stir evenly, then transfer the solution to a polytetrafluoroethylene liner for hydrothermal reaction, set the temperature Keep at 180°C for 28 hours, after cooling to room temperature, wash and dry to obtain ferric oxide nano bracelet;

[0062] 2) Disperse 0.15 g of ferric oxide nano-bracelet obtained in step 1) in 30 ml of water, then add 8 ml of a commercial graphene quantum dot solution with a concentration of 1 mg / ml, sonicate until the solution is uniform, and transfer the solution to polytetrafluoroethylene The gallbladder undergoes hydrothermal reaction, set the temperature at 180°C, and maintain it for 10 hours. After the solution is cooled, it is centrifuged ...

Embodiment 3

[0066] The preparation method of nano-bracelet ferric oxide / graphene quantum dot / tin dioxide core-shell structure composite material comprises the following steps:

[0067] 1) Add 0.26g of ferric chloride, 0.00345g of sodium sulfate, and 0.00125g of sodium dihydrogen phosphate into 40ml of deionized water, mix and stir evenly, then transfer the solution to a polytetrafluoroethylene liner for hydrothermal reaction, set the temperature Keep at 180°C for 36 hours, after cooling to room temperature, wash and dry to obtain ferric oxide nano bracelet;

[0068] 2) Dissolve 0.15 g of ferric oxide nano-bracelet obtained in step 1) in 32 ml of water, then add 6 ml of a commercial graphene quantum dot solution with a concentration of 1 mg / ml, sonicate until the solution is uniform, and transfer the solution to polytetrafluoroethylene The liner undergoes hydrothermal reaction, set the temperature at 180°C, and maintain it for 10 hours. After the solution is cooled, it is centrifuged and d...

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Abstract

The invention provides a nano-bracelet ferric oxide / graphene quantum dot / stannic oxide core-shell structure composite material, a preparation method thereof, and a battery application of same. The preparation method comprises the steps that firstly, nano bracelet ferric oxide is synthesized, then graphene quantum dots with good performance are adsorbed, and the outer layer of the graphene quantum dot ferric oxide is wrapped with silicon dioxide; finally, silicon dioxide is dissolved in the solution through wrapping of stannic oxide, and the iron trioxide / graphene quantum dot / stannic oxide composite material of the core-shell structure nano bracelet is obtained. The hollow nano bracelet core-shell structure not only can accommodate more sulfur active substances during sulfur fumigation, but also can effectively relieve the problem of volume expansion of sulfur in the charge-discharge process. Compared with the prior art, the graphene quantum dots are adsorbed in the material, so that the stability and the conductivity are improved; in addition, the core-shell structure is beneficial to relieving the volume change of sulfur; and the composite material has the capability of adsorbing polysulfide and inhibits the shuttle effect.

Description

technical field [0001] The invention belongs to the technical field of new energy materials, and specifically relates to a nano-bracelet ferric oxide / graphene quantum dot / tin dioxide core-shell structure composite material and its preparation method and application. It is used as a sulfur carrier for lithium-sulfur battery cathodes and batteries . Background technique [0002] In the field of energy technology, lithium-sulfur batteries have attracted much attention as secondary lithium batteries. Compared with commercial lithium-ion batteries, lithium-sulfur batteries have higher specific energy (2600W h / kg), and the cost of sulfur as an active material It is cheaper, safer in use, alleviates the formation of dendrites in the charging and discharging process of the battery, and increases the safety of the battery. These advantages make the lithium-sulfur battery a battery system with potential development prospects. [0003] Due to the advantages of lithium-sulfur batteries...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/06C01G19/02C01B32/194H01M4/62H01M10/052B82Y30/00B82Y40/00
CPCC01G49/06C01G19/02C01B32/194H01M4/628H01M4/625H01M10/052B82Y30/00B82Y40/00C01P2004/80C01P2004/03C01P2004/04C01P2002/72C01P2006/40Y02E60/10
Inventor 刘金云张敏朱莉影韩阗俐黄家锐
Owner ANHUI NORMAL UNIV
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