Cobalt-doped molybdenum sulfide-graphene-carbon composite material, and preparation method and application thereof

A carbon composite material and molybdenum sulfide technology, applied in electrochemical generators, electrical components, battery electrodes, etc., can solve the problems of MoS2 shape and structure, difficult to control stable crystal phase structure, etc. , good large-scale application potential, excellent charge and discharge performance

Inactive Publication Date: 2019-05-03
YANCHENG INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This is due to the doping of transition metals, carbon sources, and the addition of functional group-rich graphene oxide as raw materials to the MoS 2 It is difficult to control the formation of stable crystal phase structure

Method used

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  • Cobalt-doped molybdenum sulfide-graphene-carbon composite material, and preparation method and application thereof
  • Cobalt-doped molybdenum sulfide-graphene-carbon composite material, and preparation method and application thereof
  • Cobalt-doped molybdenum sulfide-graphene-carbon composite material, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Measure 35mL, 0.05mol / L glucose solution, take 0.05g graphite oxide powder and disperse in a certain amount of glucose solution, fully ultrasonic for 1h; add 0.2g sodium molybdate and stir for 10min, weigh 0.015g cobalt acetate and ultrasonically stir 15min, add 0.4g thiourea and stir until completely dissolved. Put it into a reactor and react in a 200°C hydrothermal box for 24 hours. Cool to room temperature and centrifuge to collect the product (washed twice with ethanol). Dry and sinter with argon at 600°C for 3h.

[0032] After fully grinding the sintered material, mix it with carbon black and carboxymethyl cellulose at a ratio of 70:15:15, and dry it in vacuum at 60° C. for 4 hours after coating to prepare a composite electrode. Put the electrode in the 2025 battery shell, use the sodium sheet as the counter electrode, use the polyethylene film as the diaphragm, and use 1M NaClO 4 In EC:EMC:DMC (volume ratio 1 / 1 / 1)+5%FEC, the electrolyte assembled battery was us...

Embodiment 2

[0034] Measure 35mL, 0.02mol / L fructose solution, take 0.005g of graphite oxide powder and disperse in a certain amount of glucose solution, fully ultrasonic for 1h; add 0.1g of sodium molybdate and stir for 10min, weigh 0.015g of cobalt acetate and ultrasonically stir 15min, add 0.5g thiourea and stir until completely dissolved. Put it into a reactor and react for 10 hours in a 220°C hydrothermal box. Cool to room temperature and centrifuge to collect the product (washed twice with ethanol). Dry and sinter in He gas at 400°C for 12h.

[0035]After fully grinding the sintered material, mix it with carbon black and carboxymethyl cellulose at a ratio of 70:15:15, and dry it in vacuum at 70° C. for 4 hours after coating to prepare a composite electrode. Put the electrode in the 2025 battery case, use the lithium sheet as the counter electrode, use the polyethylene film as the separator, and use 1M LiPF 6 EC / DEC (v / v=1 / 1) conducts constant current charge and discharge tests for...

Embodiment 3

[0037] Measure 35mL, 0.05mol / L sucrose solution, take 0.1g of graphite oxide powder and disperse in a certain amount of glucose solution, fully ultrasonic for 1h; add 1g of sodium molybdate and stir for 10min, weigh 0.025g of cobalt acetate and ultrasonically stir for 15min , Add 2g of thiourea and stir until completely dissolved. Put it into a reactor and react for 48 hours in a 150°C hydrothermal box. Cool to room temperature and centrifuge to collect the product (washed twice with ethanol). Drying, 800℃Ar / H 2 Mixed gas sintering 12h.

[0038] After fully grinding the sintered material, mix it with carbon black and carboxymethyl cellulose at a ratio of 70:15:15, and dry it in vacuum at 60° C. for 4 hours after coating to prepare a composite electrode. Put the electrode in the 2025 battery shell, use the sodium sheet as the counter electrode, use the polyethylene film as the diaphragm, and use 1M NaClO 4 In EC:EMC:DMC (volume ratio 1 / 1 / 1)+5%FEC, the electrolyte assembled ...

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Abstract

The invention discloses a cobalt-doped molybdenum sulfide-graphene-carbon composite material, and a preparation method and application thereof. The method comprises proportionally adding cobalt salt,sodium molybdate, a graphene oxide aqueous solution and thiourea into an aqueous solution of sugar; uniformly ultrasonically mixing the mixture; transferring the mixed solution to a hydrothermal reaction kettle for a hydrothermal reaction at a fixed temperature; and obtaining the cobalt-doped molybdenum sulfide-graphene-carbon composite material by washing, drying and sintering. The invention alsodiscloses the composite material and the application thereof. The method, based on the characteristic of the molybdenum sulfide used as a sodium battery negative electrode material, uses the grapheneand carbon having excellent electrical conductivity as a composite medium, utilizes cobalt doping to greatly improve electronic conductivity and sodium storage capacity of the composite material, andprepares the molybdenum sulfide-based composite electrode material having a high specific capacity and a long cycle life in one step. The material is cheap in raw materials, simple in operation process, high in yield, excellent in charge and discharge performance, convenient for industrial production, and easy to promote.

Description

technical field [0001] The invention relates to the technical field of anode materials for sodium ion batteries, in particular to a cobalt-doped molybdenum sulfide-graphene-carbon composite material and a preparation method and application thereof. Background technique [0002] With the rapid development of electric transportation and large-scale, a large amount of battery materials will be required to build a large-capacity smart grid. Lithium resources have problems of insufficient resources and uneven distribution. With the increasing use of people, the price of lithium resources has risen sharply, which has limited its large-scale development. Sodium is abundant in the earth's crust and cheap, which is an advantage in an era of high demand for renewable resources. Due to the electrochemical similarity between lithium and sodium, advanced research on Li paves the way for the development of Na-ion batteries. However, the sodium ion intercalation and storage mechanism is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/054
CPCY02E60/10
Inventor 张文惠岳鹿陈介民倪杰徐洁茅思佳徐琪关荣锋
Owner YANCHENG INST OF TECH
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