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Preparation method of vanadium tetrasulfide/graphene composite material used for electrode of sodium ion battery

A sodium-ion battery, vanadium tetrasulfide technology, applied in battery electrodes, nanotechnology for materials and surface science, secondary batteries, etc., can solve the problem that the electrochemical performance cannot meet the performance standards of commercialized sodium-ion batteries , to meet the requirements of commercial sodium-ion battery electrode applications, excellent electrochemical performance of sodium-ion batteries, and good repeatability

Inactive Publication Date: 2018-09-28
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, at present, the electrochemical performance of vanadium tetrasulfide cannot meet the performance standards of commercially available sodium-ion batteries.

Method used

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  • Preparation method of vanadium tetrasulfide/graphene composite material used for electrode of sodium ion battery
  • Preparation method of vanadium tetrasulfide/graphene composite material used for electrode of sodium ion battery
  • Preparation method of vanadium tetrasulfide/graphene composite material used for electrode of sodium ion battery

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Embodiment 1

[0026] The present embodiment provides a method for preparing a vanadium tetrasulfide / graphene composite material for an electrode of a sodium ion battery, which specifically includes the following steps:

[0027] (1) 0.5 mg / ml graphene oxide was dissolved in deionized water, and after ultrasonic dispersion for 30 minutes, it was configured into a graphene oxide solution;

[0028] (2) 10mmol sodium orthosulfate and 50mmol thioacetamide were sequentially added to the dispersed 0.5mg / ml graphene oxide solution, and stirred for 0.5h to form a mixed solution;

[0029] (3) Transfer the above mixed solution to the inner tank of the reactor, and form a mixed product after hydrothermal reaction at 180°C for 24 hours;

[0030] (4) After the reactor was cooled to room temperature, the resulting product was alternately washed 10 times with alcohol and deionized water in a fume hood, and then dried at 80°C in a vacuum oven to obtain a vanadium tetrasulfide / graphene electrode material.

Embodiment 2

[0032] This embodiment provides a kind of preparation method of the vanadium tetrasulfide / graphene composite material that is used for the electrode of sodium ion battery, and its basic steps are identical with embodiment 1, difference is: in the step (1), graphene oxide concentration is changed from "0.5 mg / ml" is changed to "1mg / ml", and the stirring time in step (2) is changed from "0.5h" to "1h".

Embodiment 3

[0034] This embodiment provides a kind of preparation method of the vanadium tetrasulfide / graphene composite material that is used for the electrode of sodium ion battery, and its basic steps are identical with embodiment 1, difference is: in the step (1), graphene oxide concentration is changed from "0.5 mg / ml" is changed to "2mg / ml", and the stirring time in step (2) is changed from "0.5h" to "2h".

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Abstract

The invention belongs to the technical field of a new energy material, specifically a preparation method of a vanadium tetrasulfide / graphene composite material used for an electrode of a sodium ion battery. By adopting a hydrothermal synthesis method and by adopting layered graphene as a template, vanadium tetrasulfide is grown on the layered graphene template (or vanadium tetrasulfide particles are coated with graphene) so as to form the vanadium tetrasulfide / graphene composite material; the method is simple in process, low in cost, high in repeatability, and suitable for a commercial application of the electrode material of the sodium ion battery; according to the preparation method, by virtue of a graphene thin film sheet layers, the nanometer vanadium tetrasulfide particles are connected between the sheet layers to form a stable solid electrolyte interface film, thereby effectively improving conductivity of the composite electrode material, and showing high rate capability and cycle stability; and the reversible specific capacity in charging and discharging cycles at the current of 0.2A.g<-1> can reach 580mAh.g<-1>, and high-current charging and discharging capability of as high as 20A.g<-1> can be realized, so that the commercial electrode application of the sodium ion battery can be satisfied.

Description

technical field [0001] The invention belongs to the technical field of energy materials and relates to a sodium ion battery electrode material, in particular to a preparation method of a vanadium tetrasulfide / graphene composite material used for a sodium ion battery electrode. Background technique [0002] The development of green energy technology and low-carbon economy has increasingly demanded low-cost commercial Na-ion batteries. Compared with lithium-ion batteries, sodium-ion batteries have many advantages: (1) The sodium source material is rich in reserves and low in price. Compared with lithium-ion battery ternary cathode materials, the cost of raw materials is reduced by half by using iron-manganese-nickel-based cathode materials; (2) ) Due to the characteristics of sodium ions, it allows the use of low-concentration sodium ion electrolytes, thereby reducing costs; (3) sodium ions do not form alloys with aluminum, and the negative electrode can use aluminum foil as a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/054B82Y30/00
CPCB82Y30/00H01M4/366H01M4/5815H01M4/625H01M10/054Y02E60/10
Inventor 廖家轩王思哲吴孟强徐自强巩峰冯婷婷
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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