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Composite electrode material and preparation method thereof

An electrode material and nano-composite technology, applied in the direction of positive electrode, battery electrode, active material electrode, etc., can solve the problems of volume change, battery capacity drop, electrode active material falling off, etc., and achieve simple synthesis process, easy operation, and improved diffusion speed effect

Inactive Publication Date: 2018-03-06
渭南高新区金石为开咨询有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 (590mAh / g) (J.Alloys Compd.2003, 351, 273.); however, studies have found that nickel sulfide prepared Li-ion battery electrode materials 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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  • Composite electrode material and preparation method thereof
  • Composite electrode material and preparation method thereof
  • Composite electrode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

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

[0028] (2): Weigh 1.64g of nickel acetate tetrahydrate and dissolve it in the graphene oxide organic solution. After stirring and dissolving, add 20uL of carbon disulfide and continue stirring for 5 minutes. In a blast drying oven, the reaction was carried out at 180° C. for 12 hours to obtain a block graphene / nickel sulfide gel, and the graphene / nickel sulfide nanocomposite material was obtained 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 certain mass ratio of super carbon black (10%) and a mass ratio of 10% PVDF are disp...

Embodiment 2

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

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

[0033] (2): Weigh 1.64g of nickel acetate tetrahydrate and dissolve it in the graphene oxide organic solution. After stirring and dissolving, add 20uL of carbon disulfide and continue stirring for 5 minutes. In a blast drying oven, the reaction was carried out at 180° C. for 12 hours to obtain a block graphene / nickel sulfide gel, and the graphene / nickel sulfide nanocomposite material was obtained 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 mass ratio of super carbon black (10%) and a mass ratio of 10% PVDF are...

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 concrete steps are as follows:

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

[0038] (2): Weigh 1.64g of nickel acetate tetrahydrate and dissolve it in the graphene oxide organic solution. After stirring and dissolving, add 20uL of carbon disulfide and continue stirring for 5 minutes. In a blast drying oven, the reaction was carried out at 180° C. for 12 hours to obtain a massive graphene / nickel sulfide gel, which was freeze-dried to obtain a graphene / nickel sulfide nanocomposite material.

[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 certain mass ratio of super carbon black (10%) and a mass ratio of 10% PVDF are ...

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Abstract

The invention discloses a graphene / nickel sulfide nano composite electrode material and a preparation method thereof. With graphene oxide as a carrier, nickel acetate providing a nickel source and carbon disulfide providing a sulfur source, the electrode material is prepared under the crosslinking effect of the graphene; the nano composite material comprises a graphene nanosheet and a nickel sulfide flower-like submicrostructure component in a weight ratio of (5 to 35%):(95 to 65%). In the invention, the graphene / nickel sulfide nano composite material is prepared from the raw materials graphene oxide, nickel acetate and carbon disulfide, by a one-pot solvothermal process in an organic solvent; the nano composite material has good electrochemical lithium storage property and can be used asa cathode material of 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 (590mAh / g) (J.Alloys Compd.2003, 351, 273.); however, studies have...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/366H01M4/5815H01M10/0525H01M2004/021H01M2004/028Y02E60/10
Inventor 不公告发明人
Owner 渭南高新区金石为开咨询有限公司
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