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Preparation method of nickel sulfide/graphene/polyaniline composite electrode material

A composite electrode and graphene technology, applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problems of limited high-power field applications, unsuitable for fast charging and discharging, and low charging and discharging efficiency, so as to improve specific capacity and rate performance , Solve the effects of poor stability, low rate performance and good rate performance

Inactive Publication Date: 2016-10-12
SHANGHAI INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the commercial lithium-ion battery anode material is mainly graphite, and its theoretical specific capacity is 372mAh / g, which limits the further improvement of its capacity, resulting in low charge and discharge efficiency, and the interaction with the electrolyte, there is an obvious voltage hysteresis
At the same time, because its lithium intercalation method is generally cross-section embedding, it is not suitable for fast charging and discharging, which limits its application in high-power fields.

Method used

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  • Preparation method of nickel sulfide/graphene/polyaniline composite electrode material
  • Preparation method of nickel sulfide/graphene/polyaniline composite electrode material
  • Preparation method of nickel sulfide/graphene/polyaniline composite electrode material

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Embodiment 1

[0021] A kind of preparation method of nickel sulfide / graphene / polyaniline composite electrode material of the present invention, the steps are as follows:

[0022] Add 0.3ml of aniline and 10mg of sodium lauryl sulfate into 50ml of water for ultrasonic dispersion, mix the dispersed aniline solution with 60ml (0.5mg / ml) of GO dispersion, and continue ultrasonication for 15min to form a stable and uniform mixture solution, stirred in an ice-water bath, and then acidified 0.7g of ammonium persulfate with 50ml (1mol / L) HCl, the solution gradually turned dark green, kept stirring in an ice-water bath for 12 hours, and then the obtained solution was centrifuged and washed 3 times with water to obtain a gel Then, ultrasonically disperse it in 180ml water, add 10ml (1mol / L) HCl dropwise therein, slowly add 600mg of nickel acetate tetrahydrate and 300mg of thioacetamide while sonicating, and then mix the resulting mixture Put it into a hydrothermal kettle, react at 180° C. for 12 hour...

Embodiment 2

[0024] A kind of preparation method of nickel sulfide / graphene / polyaniline composite electrode material of the present invention, the steps are as follows:

[0025] Add 0.2ml of aniline and 8mg of sodium lauryl sulfate into 50ml of water for ultrasonic dispersion, mix the dispersed aniline solution with 30ml (0.5mg / ml) of GO dispersion, and continue ultrasonication for 15min to form a stable and uniform mixture solution, stirred in an ice-water bath, and then acidified 0.35g of ammonium persulfate with 25ml (1mol / L) HCl, the solution gradually turned dark green, kept stirring in an ice-water bath for 12 hours, and then the obtained solution was centrifuged and washed 3 times with water to obtain a gel Then, ultrasonically disperse it in 90ml of water, add 5ml (1mol / L) HCl dropwise therein, slowly add 300mg of nickel acetate tetrahydrate and 150mg of thioacetamide dropwise while ultrasonically, then the obtained mixed solution Put it into a hydrothermal kettle, react at 180° C....

Embodiment 3

[0027] A kind of preparation method of nickel sulfide / graphene / polyaniline composite electrode material of the present invention, the steps are as follows:

[0028] Add 0.1ml of aniline and 6mg of sodium lauryl sulfate into 50ml of water for ultrasonic dispersion, mix the dispersed aniline solution with 20ml (0.5mg / ml) of GO dispersion, and continue ultrasonication for 10min to form a stable and uniform mixture solution, stirred in an ice-water bath, and then acidified 0.5g of ammonium persulfate with 50ml (1mol / L) HCl, the solution gradually turned dark green, kept stirring in an ice-water bath for 10 hours, and then the obtained solution was centrifuged and washed 3 times with water to obtain a gel Among them, during the ultrasonic and stirring process, keep the water temperature at 0-5°C; then ultrasonically disperse it in 180ml of water, add 10ml (1mol / L) HCl dropwise, and slowly add 420mg of acetic acid tetrahydrate while ultrasonically Nickel and 210 mg of thioacetamide,...

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Abstract

The invention relates to a preparation method of a nickel sulfide / graphene / polyaniline composite electrode material. The method comprises the following steps: carrying out ultrasonic dispersion on graphene oxide uniformly, adding lauryl sodium sulfate aqueous solution and aniline respectively, performing mixing, ultrasonically forming a stable and uniform mixture, performing stirring in an ice water bath and dropwise adding ammonium persulfate acidified by hydrochloric acid, performing continuous stirring in the ice water bath for 12 hours, performing centrifugation and water washing on the obtained a dark green solution to obtain a gelatinous substance, and ultrasonically dispersing the gelatinous substance in a hydrochloric acid solution, then dropwise adding a nickel acetate tetrahydrate aqueous solution and a thioacetamide solution into the ultrasonically dispersed gelatinous substance, carrying out ultrasound continuously to reach uniformity, carrying out a hydrothermal reaction for 12 hours at the temperature of 180 DEG C, and then performing centrifugation, water washing, and freeze-drying to obtain the nickel sulfide / graphene / polyaniline composite electrode material. Compared with the prior art, the preparation method of the nickel sulfide / graphene / polyaniline composite electrode material disclosed by the invention aims at improving an anode material of a lithium ion battery, so as to obtain the anode material which is good in stability and easy to control, and improve performance of the lithium-ion battery.

Description

[technical field] [0001] The invention relates to the technical field of negative electrode materials for lithium ion batteries, in particular to a method for preparing a nickel sulfide / graphene / polyaniline composite electrode material. [Background technique] [0002] Lithium-ion batteries have the advantages of high working voltage, high energy density, good safety performance, small self-discharge, no memory effect, and wide working range. They are favored by people and are called the leading power source in the 21st century. Therefore, it is widely used in portable electronic products such as digital cameras, mobile phones and notebook computers. [0003] At present, the commercial lithium-ion battery anode material is mainly graphite, and its theoretical specific capacity is 372mAh / g, which limits the further improvement of its capacity, resulting in low charge and discharge efficiency, and the interaction with the electrolyte. voltage hysteresis. At the same time, bec...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/587H01M4/60H01M10/0525
CPCH01M4/362H01M4/5815H01M4/587H01M4/608H01M10/0525Y02E60/10
Inventor 韩生刘金宝蔺华林刘益林陈红艳喻宁波冯晨萁韦焕明
Owner SHANGHAI INST OF TECH
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