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Nano-NiS/graphene composite anode material and preparation method thereof

A graphene composite and positive electrode material technology, applied in battery electrodes, electrochemical generators, electrical components, etc., can solve the problems of complex process, poor controllability, high energy consumption, etc., and achieve simple preparation process, inhibition of dissolution, The effect of a good conductive network

Active Publication Date: 2014-11-05
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Spray pyrolysis and electrodeposition are often used to prepare composites, but such preparation methods are complicated in process, poor in controllability, low in yield, high in energy consumption and high in cost
The preparation of NiS with special morphology mostly uses organic templates or organic surfactants, with low yield and high cost

Method used

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  • Nano-NiS/graphene composite anode material and preparation method thereof
  • Nano-NiS/graphene composite anode material and preparation method thereof
  • Nano-NiS/graphene composite anode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Weigh 0.3 g Ni(CH 3 COO) 2 4H 2O, 0.5 g of trisodium citrate was dissolved in 70 ml of deionized water, stirred evenly to form a green clear solution, weighed 0.2 g L-cysteine ​​and added to the solution, stirred evenly to form a brownish yellow clear solution, and ammonia was added to the solution , so that the pH of the solution was adjusted to 13, and finally the obtained red clear solution was poured into a 100 ml polytetrafluoroethylene-lined hydrothermal kettle at 120 o C for 12 h. The obtained product was centrifuged and washed with deionized water and ethanol, and finally the obtained powder was ultrasonically dispersed in a mixture of 40 ml deionized water and 20 ml ethanol, and 0.1 ml APTES was added to modify the surface of NiS to make it The surface is positively charged, and this solution is labeled solution A;

[0032] Weigh 10 mg graphene oxide (GO) powder and ultrasonically disperse it in a mixed solution of 70 ml deionized water and 10 ml ethanol, a...

Embodiment 2

[0035] Weigh 0.5 g Ni(CH 3 COO) 2 4H 2 O, 0.5 g of trisodium citrate was dissolved in 70 ml of deionized water, stirred evenly to form a green clear solution, weighed 0.5 g L-cysteine ​​and added to the solution, stirred evenly to form a brown-yellow clear solution, and ammonia was added to the solution , adjust the pH of the solution to 8 and stir for 1 h, and finally pour the obtained red clear solution into a 100 ml polytetrafluoroethylene-lined hydrothermal kettle at 160 o C for 20 h. The obtained powder particles were separated and washed with deionized water and ethanol, and finally ultrasonically dispersed in a mixture of 50 ml deionized water and 10 ml ethanol, and 0.6 ml APTES was added to modify the surface of NiS so that the surface was covered with Positive charge, this solution is marked as solution A;

[0036] Weigh 50 mg graphene oxide (GO) powder and ultrasonically disperse it in a mixed solution of 50 ml deionized water and 50 ml ethanol, and this solution...

Embodiment 3

[0039] Weigh 0.4 g Ni(CH 3 COO) 2 4H 2 O, 0.5 g of trisodium citrate was dissolved in 70 ml of deionized water, stirred evenly to form a green clear solution, weighed 0.9 g L-cysteine ​​and added to the solution, stirred evenly to form a brownish yellow clear solution, and ammonia was added to the solution , the pH of the solution was adjusted to 10 and stirred for 1 h, and finally the obtained red clear solution was poured into a 100 ml hydrothermal kettle with a Teflon liner, at 180 o C for 36 h. The obtained powder particles were separated and washed with deionized water and ethanol, and finally ultrasonically dispersed in a mixture of 40 ml deionized water and 20 ml ethanol, and 0.1 ml APTES was added to modify the surface of NiS, so that the surface was covered with Positive charge, this solution is marked as solution A;

[0040] Weigh 30 mg graphene oxide (GO) powder and ultrasonically disperse it in a mixed solution of 30 ml deionized water and 50 ml ethanol, and th...

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Abstract

The invention provides a preparation method of a NiS / graphene composite anode material. The method includes: firstly preparing NiS nanoparticles by a solvothermal method, performing surface modification on the NiS particles by a surfactant, then compounding the modified NiS particles with graphene oxide under electrostatic attraction; and reducing graphene oxide by hydrazine hydrate so as to finally form graphene packaged nano-NiS / graphene composite anode material. The dispersion and packaging effects of graphene on NiS can effectively buffer NiS's volume expansion generated during charging and discharging, and inhibit dissolution of the product in an electrolyte solution in an electrode reaction process, thus improving the cyclic stability of the composite material. At the same time, graphene provides a good conductive network, which is conducive to rapid transmission of electrons, thereby reducing electrode polarization and greatly improving the rate performance of the composite material. The NiS / graphene composite material prepared by the method provided by the invention has excellent electrochemical performance, and the preparation process is simple, the conditions are mild, so that the method is suitable for large-scale industrialized production.

Description

technical field [0001] The invention belongs to the field of new energy materials and electrochemistry, and specifically relates to a novel rechargeable and dischargeable lithium battery nano-nickel sulfide / graphene (NiS / graphene) composite cathode material and a preparation method thereof. technical background [0002] In today's era, with its advantages of high reversible capacity, high voltage, high cycle performance, high energy density, long cycle life, small self-discharge rate and no memory effect, lithium batteries are used in digital electronic products such as mobile phones, notebooks and hybrid electric vehicles. field has been widely used. With the rapid development of electronic digital products, the performance requirements of the batteries used are getting higher and higher, and there is an urgent need for lithium batteries with high capacity and high energy density to meet the market demand. Today, the "bottleneck" that limits the capacity of lithium batteri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/136H01M4/133H01M4/1397H01M4/1393
CPCH01M4/366H01M4/5815H01M4/625H01M10/0525Y02E60/10
Inventor 赵海雷张子佳高春辉曾志鹏王捷
Owner UNIV OF SCI & TECH BEIJING
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