Graphene/nickel sulphide nano composite electrode material and preparation method thereof

A technology of nanocomposite materials and graphene nanosheets, which is applied in the direction of battery electrodes, nanotechnology, nanotechnology, etc., can solve the problems of battery capacity decline, volume change, electrode active material shedding, etc., and achieve easy operation, simple synthesis process, The effect of increasing the diffusion rate

Inactive Publication Date: 2014-12-03
NANCHANG HANGKONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
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Problems solved by technology

Nickel sulfide is a potential lithium-ion battery electrode material, which has the advantages of high theoretical lithium storage specific capacity (590 mAh / g) ( J. Alloys Compd. 2003, 351, 273. ); however, studies have found that lithium-ion battery electrode materials prepared from nickel sulfide often suffer from large volume changes
During the long-term intercalation or deintercalation of lithium ions, large volume changes will cause the electrode active material to fall off from the current collector, resulting in a rapid decline in battery capacity.

Method used

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  • Graphene/nickel sulphide nano composite electrode material and preparation method thereof
  • Graphene/nickel sulphide nano composite electrode material and preparation method thereof
  • Graphene/nickel sulphide nano composite electrode material and preparation method thereof

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Effect test

Embodiment 1

[0026] Embodiment 1: prepare graphene / nickel sulfide nanocomposite electrode material mass ratio and be the composite material of 5:95 and measure its electrochemical lithium storage performance, concrete steps are as follows:

[0027] (1): Prepare 0.2 mg / mL graphene oxide organic solution;

[0028] (2): Weigh 1.64 g of nickel acetate tetrahydrate and dissolve it in the graphene oxide organic solution. After stirring and dissolving, add 20 uL of carbon disulfide and continue stirring for 5 minutes. Then put the mixed test solution into the inner lining of the stainless steel reaction kettle. Move it into a blast drying oven, and react at 180 °C for 12 h to obtain a bulk graphene / nickel sulfide gel, and obtain a graphene / nickel sulfide nanocomposite material after freeze-drying.

[0029] (3): Electrochemical lithium storage performance test of graphene / nickel sulfide nanocomposite:

[0030] A certain mass ratio of graphene / nickel sulfide nanocomposite (80%) and a certa...

Embodiment 2

[0031] Embodiment 2: prepare graphene / nickel sulfide nano-composite electrode material mass ratio is the composite material of 10:90 and measure its electrochemical lithium storage performance, concrete steps are as follows:

[0032] (1): Prepare 0.5 mg / mL graphene oxide organic solution;

[0033] (2): Weigh 1.64 g of nickel acetate tetrahydrate and dissolve it in the graphene oxide organic solution. After stirring and dissolving, add 20 uL of carbon disulfide and continue stirring for 5 minutes. Then, put the mixed test solution into the inner lining of the stainless steel reaction kettle. Move it into a blast drying oven, and react at 180 °C for 12 h to obtain a bulk graphene / nickel sulfide gel, and obtain a graphene / nickel sulfide nanocomposite material after freeze-drying.

[0034] (3): Electrochemical lithium storage performance test of graphene / nickel sulfide nanocomposite:

[0035] A certain mass ratio of graphene / nickel sulfide nanocomposite (80%) and a certain...

Embodiment 3

[0036] Embodiment 3: preparation graphene / nickel sulfide nanocomposite electrode material mass ratio is the composite material of 20: 80 and measures its electrochemical lithium storage performance, and specific steps are as follows:

[0037] (1): Prepare 1.0 mg / mL graphene oxide organic solution;

[0038](2): Weigh 1.64 g of nickel acetate tetrahydrate and dissolve it in the graphene oxide organic solution. After stirring and dissolving, add 20 uL of carbon disulfide and continue stirring for 5 minutes. Then, put the mixed test solution into the inner lining of the stainless steel reaction kettle. Move it into a blast drying oven, and react at 180 °C for 12 h to obtain a bulk graphene / nickel sulfide gel, and obtain a graphene / nickel sulfide nanocomposite material after freeze-drying.

[0039] (3): Electrochemical lithium storage performance test of graphene / nickel sulfide nanocomposite:

[0040] A certain mass ratio of graphene / nickel sulfide nanocomposite (80%) and a cert...

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Abstract

The invention discloses a graphene / nickel sulphide nano composite electrode material and a preparation method thereof. The graphene / nickel sulphide nano composite electrode material is prepared under the crosslinked action of graphene with graphene oxide as a carrier, nickel acetate as a nickel source and carbon disulphide as a sulphur source. The graphene / nickel sulphide nano composite electrode material comprises graphene nanosheets and nickel sulphide flower-type submicrostructure ingredients in a mass ratio of (5-35%): (95-65%). The preparation method of the graphene / nickel sulphide nano composite electrode material has the advantages that graphene oxide, nickel acetate and carbon disulphide are taken as raw materials and the graphene / nickel sulphide nano composite electrode material is obtained by adopting a one-pot solvothermal method in an organic solvent, and the graphene / nickel sulphide nano composite electrode material has good electrochemical lithium storage property and can serve as a cathode material for a lithium ion battery.

Description

technical field [0001] The invention relates to a graphene / nickel sulfide nanocomposite electrode material, in particular to a graphene / nickel sulfide nanocomposite electrode material and a preparation method thereof. technical background [0002] Due to its many advantages such as high voltage, large specific capacity, long cycle life, no memory effect and environmental friendliness, lithium-ion batteries occupy a leading position in the secondary battery market. At present, lithium-ion batteries have been widely used in portable mobile electronic products, and are gradually expanding to electric vehicles, grid energy storage and other fields. It is well known that the electrochemical properties of lithium-ion batteries mainly depend on the electrode materials. Nickel sulfide is a potential lithium-ion battery electrode material, which has the advantages of high theoretical lithium storage specific capacity (590 mAh / g) ( J. Alloys Compd. 2003, 351, 273. ); however, studie...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/62B82Y30/00
CPCB82Y30/00H01M4/366H01M4/5815H01M4/625H01M10/0525H01M2004/021Y02E60/10
Inventor 陈德志权红英罗旭彪罗胜联邓芳
Owner NANCHANG HANGKONG UNIVERSITY
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