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Method for preparing nano-sulfur / graphene oxide composite electrode material

A graphene composite and electrode material technology, applied in battery electrodes, circuits, electrical components, etc., can solve problems affecting battery discharge capacity and cycle performance, reducing the utilization rate of active materials, etc.

Inactive Publication Date: 2012-11-07
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The dispersion state of the active material sulfur in the conductive agent skeleton also determines the mass transfer rate and electron conduction rate of the electrochemical reaction. If the active material is not uniformly dispersed, the utilization rate of the active material will be reduced, thereby affecting the discharge capacity and cycle performance of the battery.

Method used

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  • Method for preparing nano-sulfur / graphene oxide composite electrode material
  • Method for preparing nano-sulfur / graphene oxide composite electrode material
  • Method for preparing nano-sulfur / graphene oxide composite electrode material

Examples

Experimental program
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Effect test

Embodiment 1

[0030] Prepare nano-sulfur / graphene oxide composite material by chemical method, its process and steps are as follows:

[0031] Using sodium thiosulfate as raw material to prepare nano-sulfur / graphene oxide composites: 1.5g Na 2 S 2 o 3 Dissolve in 250ml of deionized water, add 10 mL of 1% sodium dodecylbenzenesulfonate, stir in a clean three-neck flask for 1 h; carefully transfer to 70°C oil bath, slowly add 12 mL of concentrated HCl dropwise, Insulate for 10 minutes; add 50 mL of hydroalcoholic solution containing 20 mg graphene oxide and 10 mg acetylene black under vigorous stirring, cool to room temperature after 20 minutes, centrifuge, and vacuum dry at 60°C for 12 hours to obtain the positive electrode material.

[0032] See attached figure 1 , figure 1 XRD patterns of sublimated sulfur and S graphene oxide (GO). According to the PCPDS card search, it can be seen that the sulfur crystallization generated by the reaction of sodium thiosulfate as a raw material is goo...

Embodiment 2

[0035] Prepare nano-sulfur / graphene oxide composite material by chemical method, its process and steps are as follows:

[0036] Using sodium sulfide and sublimated sulfur as raw materials to prepare nano-sulfur / graphene oxide composites: 0.3g sublimated sulfur and 0.3g Na 2 S was added to deionized water, ultrasonicated for 5 hours until the sublimated sulfur was completely dissolved, and 100 mg of dodecyltrimethylammonium bromide was dispersed into a three-necked flask with 250 mL of deionized water, and stirred evenly until completely dissolved. Mix and stir the above two solutions for 2 hours until it turns orange; carefully transfer to a 70°C oil bath, slowly add 12mL of concentrated HCl dropwise, and keep warm for 10min; add 20mg of graphene oxide and 10mg of acetylene black in 50mL of hydroalcoholic solution under vigorous stirring , cooled to room temperature after 20 min, centrifuged, and vacuum-dried at 60°C to obtain the positive electrode material.

[0037] See att...

Embodiment 3

[0040] Prepare nano-sulfur / graphene oxide composite material by chemical method, its process and steps are as follows:

[0041] Using sodium sulfide and ferric chloride as raw materials to prepare nano-sulfur / graphene oxide composite materials, specifically as follows: 1g sodium sulfide and 0.01g triton were dissolved in 100ml of deionized water respectively, in a clean three-necked flask Mix and stir the two for 1 hour. At 25°C, add 2 mL of concentrated HCl to it. After sodium sulfide and concentrated HCl react to generate hydrogen sulfide, slowly add 100 mL of 1 mol / L ferric chloride solution with a constant pressure dropping funnel, and seal it. In a three-neck flask, stir vigorously for 10 hours, so that ferric chloride can fully oxidize hydrogen sulfide to generate elemental sulfur; add 20 mg of graphene oxide and 10 mg of acetylene black in 50 mL of hydroalcoholic solution under vigorous stirring, cool to room temperature after 20 min, and centrifuge. After vacuum drying...

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Abstract

The invention relates to a method for preparing a nano-sulfur / graphene oxide composite material with high specific capacity and belongs to the field of cross application of material synthesis and electrochemical power supplies. The nano-sulfur / graphene oxide composite material is applicable to an electrode material of a lithium sulfur secondary battery with the high specific capacity. The method is characterized by comprising the following steps of: synthesizing nano-sulfur particles by using a simple chemical method under the protection of a surfactant; and uniformly attracting graphene oxide and a carbon material to the surfaces of the nano-sulfur particles by interaction of the surfactant and the graphene oxide to form a core-shell type nano-sulfur / graphene oxide composite material. The graphene oxide and the carbon material coat a sulfur surface, so a sulfur electrode material is stable in structure, high in electric conductivity and high in cycle performance. Environmentally-harmful materials are not employed, and the method can be implemented at low temperature, and is low in energy consumption in the synthesis process and low in equipment requirement. The synthesized material is high in charging / discharging capacity, non-toxic and harmless to a human body, and sulfur is abundant in nature, so the material has a good industrial prospect and can be applied to large-scale industrial production.

Description

technical field [0001] The invention uses a chemical method to prepare nanoscale sulfur and a modified material coated with graphene oxide, and uses it as the positive electrode material of the lithium-sulfur battery to construct the positive electrode material of the lithium-sulfur battery with high specific capacity and good cycle performance. Background technique [0002] In recent years, batteries have played an increasingly important role in modern society, and higher requirements have been placed on the performance of batteries. Therefore, the preparation and electrochemical performance research of cathode materials for lithium-sulfur batteries with high energy density has become a hot project. The specific energy of traditional cathode materials is low, and the materials using elemental sulfur as the cathode have greater advantages in specific energy and specific power than other battery systems, so they have attracted widespread attention. [0003] Lithium-sulfur se...

Claims

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Application Information

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IPC IPC(8): H01M4/38H01M4/62
CPCY02E60/12Y02E60/10
Inventor 赵宏滨潘兰英邢思忆石蕾徐甲强
Owner SHANGHAI UNIV
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