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Sulfur/tin oxide/graphene battery cathode material, preparation method and lithium sulfur battery

A battery positive electrode, tin oxide technology, applied in the field of nanomaterials, can solve the problems of poor cycle stability and safety performance, short service life of lithium-sulfur batteries, unsuitable for large-scale production, etc., to improve capacity stability and service life, The effect of improving electrical conductivity and improving electrochemical performance

Inactive Publication Date: 2019-01-01
GUANGDONG UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method has certain requirements on equipment, and the steps are cumbersome and not suitable for large-scale production. In addition, there is another method to mix sublimated sulfur with mesoporous silica, and after secondary calcination, sulfur element is embedded in the pore diameter by capillary force to obtain silica sulfur complex
This method completes sulfur fixation by capillary force, but its firmness is still unsatisfactory
[0005] Therefore, in the existing lithium-sulfur battery cathode materials, due to the poor immobilization of sulfur element, the shuttle effect caused by the dissolution of polysulfides, and the change in the volume of lithium-sulfur batteries, the lithium-sulfur battery has short service life, poor conductivity, and poor cycle stability. Poor safety performance has become a technical problem to be solved urgently by those skilled in the art

Method used

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  • Sulfur/tin oxide/graphene battery cathode material, preparation method and lithium sulfur battery
  • Sulfur/tin oxide/graphene battery cathode material, preparation method and lithium sulfur battery
  • Sulfur/tin oxide/graphene battery cathode material, preparation method and lithium sulfur battery

Examples

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Effect test

Embodiment 1

[0044] Preparation of nitrogen-doped graphene: Measure 150ml of 0.8mg / ml graphene oxide aqueous solution and place it in a 250ml beaker, then add 6ml of 50wt% cyanamide aqueous solution, stir evenly, transfer to a three-necked flask, and react at 80°C for 30h , the reaction product was suction filtered, washed with deionized water, frozen, and freeze-dried to obtain nitrogen-doped graphene.

[0045] Preparation of graphene-tin oxide nanocomposite material: take 40mg of nitrogen-doped graphene, add it to 200ml of absolute ethanol for ultrasonic dispersion, then take 0.1mmol of tin tetrachloride (SnCl 4), dissolved in 10ml of absolute ethanol, added to the dispersed nitrogen-doped graphene solution, magnetically stirred until it was uniformly dispersed, then dripped into 5ml of deionized water and transferred the dispersion to the reactor for 100 After reacting at ℃ for 4 hours, the reaction product was cooled naturally, and subjected to suction filtration, washing, freezing, an...

Embodiment 2

[0055] Preparation of nitrogen-doped graphene: Weigh 120 mg of graphene oxide and place it in a 250 ml beaker, add 200 ml of deionized water, ultrasonically disperse evenly, and transfer to a three-necked flask. Then add 5 g of melamine, stir evenly, react at 100° C. for 10 h, filter the reaction product with suction, wash with deionized water, freeze, and freeze-dry to obtain nitrogen-doped graphene.

[0056] Preparation of graphene-tin oxide nanocomposites: Weigh 40mg of nitrogen-doped graphene, ultrasonically disperse it into 160ml of ethylene glycol, and then take 1mmol of SnCl 4 , dissolved in 10ml of ethylene glycol, then added to the dispersed nitrogen-doped graphene solution, magnetically stirred until it was uniformly dispersed, then dropped into 10ml of deionized water and the dispersion was transferred to the reaction kettle for 130 After reacting at ℃ for 0.5h, the reaction product was naturally cooled, and subjected to suction filtration, washing, freezing, and fr...

Embodiment 3

[0059] Preparation of nitrogen-doped graphene: Weigh 120 mg of graphene oxide and place it in a 250 ml conical beaker, add 200 ml of deionized water, and disperse evenly by ultrasonication. Then add 7 g of dicyandiamide, stir evenly, react at 100°C for 16 hours, filter the reaction product with suction, wash with deionized water, freeze, and freeze-dry to obtain nitrogen-doped graphene.

[0060] Preparation of graphene-tin oxide nanocomposites: Weigh 40mg of nitrogen-doped graphene and ultrasonically disperse it in 200ml of carbon tetrachloride, then take 0.4mmol of tin protochloride (SnCl 2 ), dissolved in 10ml of carbon tetrachloride, then added to the dispersed nitrogen-doped graphene solution, magnetically stirred until it was evenly dispersed, then slowly added 8ml of deionized water, and then the dispersion was transferred to the reaction React in a kettle at 130°C for 3 hours, and wait for the reaction product to cool naturally, and then carry out suction filtration, wa...

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Abstract

The invention relates to the technical field of nanometer materials, in particular to a sulfur / tin oxide / graphene battery cathode material, a preparation method and a lithium sulfur battery. The invention discloses a preparation method of a sulfur / tin oxide / graphene battery cathode material, comprising the following steps: Step 1, nitrogen doped graphene and a tin salt solution are hydrothermallyreacted to obtain a graphene-tin oxide nano-composite material; and Step 2: the graphene-tin oxide nano-composite material and elemental sulfur are mixed to obtain a mixture, and a vacuum melting diffusion reaction is carried out on the mixture to obtain a sulfur / tin oxide / graphene battery cathode material. The invention also discloses a sulfur / tin oxide / graphene battery cathode material preparedby the method and a lithium sulfur battery thereof. The invention solves the technical problems that the elemental sulfur in the prior art cannot be effectively utilized in the cathode material of thelithium sulfur battery, thereby leading to short service life, and poor conductivity, cycle stability and safety performance of the lithium sulfur battery.

Description

technical field [0001] The invention relates to the technical field of nanomaterials, in particular to a sulfur / tin oxide / graphene battery cathode material, a preparation method and a lithium-sulfur battery. Background technique [0002] In order to meet the increasing demand for large-scale energy storage and sustainable use, it is imminent to develop new electrochemical energy storage systems. In the new energy storage system, the theoretical specific energy of a lithium-sulfur battery with metallic lithium as the negative electrode and elemental sulfur as the positive electrode can reach 2600Wh / kg (the theoretical specific capacities of lithium and sulfur are 3860mAh / g and 1675mAh / g, respectively). Much larger than the commercial secondary batteries used at this stage. In addition, lithium-sulfur batteries have attracted extensive attention due to their outstanding advantages of high specific energy, low raw material cost, and environmental friendliness, and are therefor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/364H01M4/38H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 单炯威李运勇黄莹朱俊陆严亮
Owner GUANGDONG UNIV OF TECH
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