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Preparation method of graphene composite sponge of Li-S battery cathode material

A graphene composite, battery positive electrode technology, applied in the field of graphene composite sponge preparation, can solve the problems of poor electrochemical stability, utilization obstruction, low cycle stability of positive electrode materials, etc., and achieve high rate performance and high utilization rate. , the effect of fast reaction kinetics

Inactive Publication Date: 2019-07-12
SHANDONG XINGHUO SCI TECH INSTITYTE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, poor electrochemical stability, cycle stability, and low utilization of cathode materials have long been obstacles to the rapid development of LiS batteries.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] A preparation method of a graphene composite sponge of Li-S battery positive electrode material, comprising the following steps:

[0017] (1) Preparation of microemulsion precursor: Weigh 0.1 g of sodium di(2-ethyl)hexyl sulfosuccinate (AOT) powder, add 500 ml of deionized water, and ultrasonically stir for 10 min to obtain a microemulsion precursor;

[0018] (2) Preparation of graphene microemulsion: Weigh 1g flake graphene oxide powder (GO) into 500ml of N-methylpyrrolidone (NMP), ultrasonically stir for 10min to obtain GO-NMP solution, and then add 100ml of Slowly drop GO-NMP solution into 100ml of microemulsion precursor solution, and ultrasonically stir for 1 hour to prepare graphene microemulsion;

[0019] (3) Preparation of sulfur-microemulsion: Weigh 0.1g of elemental sulfur particles, ball mill for 0.5h, microwave reduce the elemental sulfur particles after ball milling for 0.5h, add 300ml of organic solvent to the reduced elemental sulfur particles, and ultras...

Embodiment 2

[0025] A preparation method of a graphene composite sponge of Li-S battery positive electrode material, comprising the following steps:

[0026] (1) Preparation of microemulsion precursor: Weigh 0.3 g of sodium di(2-ethyl)hexyl sulfosuccinate (AOT) powder, add 200 ml of deionized water, and ultrasonically stir for 15 minutes to obtain a microemulsion precursor;

[0027] (2) Preparation of graphene microemulsion: Weigh 3g of flaky graphene oxide powder (GO) and add it to 400ml of N-methylpyrrolidone (NMP), ultrasonically stir for 30min to obtain a GO-NMP solution, and then add 100ml of The GO-NMP solution was slowly dropped into 150ml of microemulsion precursor solution, and stirred ultrasonically for 2 hours to obtain a graphene microemulsion;

[0028] (3) Preparation of sulfur-microemulsion: Weigh 0.5 g of elemental sulfur particles, ball mill for 2 hours, microwave reduce the elemental sulfur particles after ball milling for 2 hours, add 200 ml of organic solvent to the redu...

Embodiment 3

[0034] A preparation method of a graphene composite sponge of Li-S battery positive electrode material, comprising the following steps:

[0035] (1) Preparation of the microemulsion precursor: Weigh 0.5 g of sodium di(2-ethyl)hexyl sulfosuccinate (AOT) powder, add 500 ml of deionized water, and ultrasonically stir for 30 minutes to obtain the microemulsion precursor;

[0036] (2) Preparation of graphene microemulsion: Weigh 5g of flaky graphene oxide powder (GO) and add it to 500ml of N-methylpyrrolidone (NMP), ultrasonically stir for 30min to obtain GO-NMP solution, and then add 100ml of The GO-NMP solution was slowly dropped into 200ml of microemulsion precursor solution, and stirred ultrasonically for 2 hours to obtain a graphene microemulsion;

[0037](3) Preparation of sulfur-microemulsion: Weigh 1 g of elemental sulfur particles, ball mill for 4 hours, reduce the elemental sulfur particles after ball milling by microwave for 2 hours, add 300 ml of organic solvent to the ...

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Abstract

The invention relates to a preparation method of a graphene composite sponge of a Li-S battery cathode material. The method comprises the following steps of: taking sodium bis(2-ethylhexylhexyl) sulfosuccinate powder, adding the sodium bis(2-ethylhexylhexyl) sulfosuccinate powder into deionized water to obtain a microemulsion precursor solution; taking sheet-shaped graphene oxide powder (GO) intothe N-methyl-2-pyrrolidone (NMP) to prepare a GO-NMP solution, slowly dropping the GO-NMP solution into the microemulsion precursor solution, namely preparing a graphene microemulsion; taking elemental sulfur particles, performing microwave reduction of the elemental sulfur particles after ball milling, then adding the elemental sulfur particles into an organic solvent, and slowly dropping the mixture into the microemulsion precursor solution to prepare a sulfur microemulsion; and slowly dropping the sulfur microemulsion into the graphene microemulsion for continuous stirring by employing ultrasound, and performing filtering to obtain granular precipitates, namely preparing the sulfur-coated graphene composite sponge material. The three-dimensional porous graphene framework facilitates achievement of the rapid reaction kinetic, and the sulfur-coated graphene composite sponge can develop a higher active material utilization rate.

Description

technical field [0001] The invention relates to the field of lithium battery electrode preparation, in particular to a method for preparing a graphene composite sponge as a positive electrode material of a Li-S battery. Background technique [0002] With the development of industry and the increasing activity of human activities, human consumption of energy is increasing day by day, while underground non-renewable resources are becoming increasingly scarce, and the contradiction between energy supply and demand is increasingly intensified. Energy issues have become one of the key issues affecting human survival and development. The lithium-ion battery of the new energy storage system should have the advantages of high voltage, large capacity, no memory effect and long life, and can be widely used in digital products such as mobile phones, digital cameras, notebook computers, and power tools such as electric vehicles and hybrid electric vehicles . [0003] Lithium-sulfur bat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/583H01M4/62H01M10/0525C01B32/182
CPCC01B32/182H01M4/366H01M4/38H01M4/583H01M4/625H01M10/0525Y02E60/10
Inventor 车春玲
Owner SHANDONG XINGHUO SCI TECH INSTITYTE
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