Method for preparing nickel sulfide/graphene nanocomposite, lithium ion battery cathode and lithium ion battery

A technology of nanocomposite materials and lithium-ion batteries, applied in battery electrodes, nanotechnology, nanotechnology, etc., can solve the problems of lithium-ion battery performance degradation, easy overlapping of sheet structures, poor electrochemical performance, etc., and achieve experimental equipment Low requirements, good cycle performance, and stable performance

Active Publication Date: 2016-12-07
ANHUI NORMAL UNIV
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Problems solved by technology

[0005] However, graphene also has some problems as a negative electrode material for lithium-ion batteries: the sheet structure of graphene is easy to overlap, so when it is used as a negative electrode material for lithium-ion batteries, its electrochemical performance is relatively poor, and graphene must be surface modified, Doping, compounding with other high energy densi

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  • Method for preparing nickel sulfide/graphene nanocomposite, lithium ion battery cathode and lithium ion battery
  • Method for preparing nickel sulfide/graphene nanocomposite, lithium ion battery cathode and lithium ion battery
  • Method for preparing nickel sulfide/graphene nanocomposite, lithium ion battery cathode and lithium ion battery

Examples

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Embodiment 1

[0039] Preparation of graphite oxide: weigh 5.0g graphite and 3.75g NaNO respectively 3 Put it into a 1L beaker, stir vigorously, slowly add 150mL of concentrated sulfuric acid, stir for 0.5 hours, then slowly add 20g of KMnO 4 , Added in 0.5 hours, and continued to stir for 20 hours, because the viscosity of the reactant increased, the stirring was stopped, and a paste-like purple-red substance was obtained. After standing for 5 days, slowly add 500mL deionized water and 30mLH 2 o 2 At this time, the color of the solution becomes more obvious bright yellow. After the solution is fully reacted, it is centrifuged and washed to obtain graphite oxide.

[0040] Hydrothermal process: Dissolve 70mg graphene oxide in 80mL deionized water, add 10mL concentrated sulfuric acid (ρ=1.84g / cm 3 ), ultrasonically dispersed for 3 hours, and then transferred to a reaction kettle, and reacted at a constant temperature of 160 ° C for 24 hours to obtain three-dimensional columnar reduced graph...

Embodiment 2

[0043] The preparation method of graphite oxide is with embodiment 1.

[0044] Hydrothermal process: Dissolve 110mg graphene oxide in 80mL deionized water, add 8mL concentrated sulfuric acid (ρ=1.84g / cm 3 ), ultrasonically disperse for 2 hours, then transfer it to a reactor, and react at a constant temperature of 190°C for 20 hours to obtain three-dimensional columnar reduced graphene oxide, which is washed and collected.

[0045] Composite process: Dissolve 1.2g of nickel nitrate, 0.6g of thiourea, and 0.6g of urea into a mixed solvent (12mL of water and 4mL of ethanol), add 22mg of three-dimensional columnar reduced graphene oxide into the above mixed solution, soak at 20°C for 2 Then transfer it to a reactor, react at a constant temperature of 220°C for 22 hours, wash the product, dry it in vacuum at 40°C for 12 hours, and collect the nickel sulfide / graphene nanocomposite material.

Embodiment 3

[0047] The preparation method of graphite oxide is with embodiment 1.

[0048] Hydrothermal process: Dissolve 90mg graphene oxide in 80mL deionized water, add 9mL concentrated sulfuric acid (ρ=1.84g / cm 3 ), ultrasonically disperse for 4 hours, then transfer it to a reactor, and react at a constant temperature of 260°C for 18 hours to obtain three-dimensional columnar reduced graphene oxide, which is washed and collected.

[0049] Composite process: 0.6g nickel chloride, 0.3g thioacetamide, and 0.2g urea were dissolved in a mixed solvent (4mL water and 12mL DMF), and 18mg three-dimensional columnar reduced graphene oxide was added to the above mixed solution, 30 ℃ soaking for 3 days, then transferred to the reactor, 240 ℃ constant temperature reaction for 20 hours, the product was washed, 70 ℃ vacuum drying for 6 hours, and the nickel sulfide / graphene nanocomposite material was collected.

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Abstract

The invention discloses a method for preparing a nickel sulfide/graphene nanocomposite, a lithium ion battery cathode and a lithium ion battery. The preparation method comprises a hydrothermal process and a compounding process. According to the preparation method, nickel sulfide is compounded on graphene, and a black nickel sulfide and graphene composite is obtained through washing and drying. The composite has a very large specific surface area, and the dropping between nickel sulfide and graphene is effectively avoided in the lithiation process; what is most important, the agglomeration problem of graphene and nickel sulfide nano particles is solved to a large extent, the shortcomings of poor stability and poor electrical conductivity and the like are overcome well, and thus the goal of improving battery performances is achieved. The nanocomposite is applied to a lithium ion battery cathode material and has the advantages of good cycle stability and high specific energy density and the like.

Description

technical field [0001] The invention relates to the technical field of inorganic nanomaterials, in particular to a preparation method of a nickel sulfide / graphene nanocomposite material, a negative electrode of a lithium ion battery, and a lithium ion battery. Background technique [0002] Energy issues are related to human development, so more and more people are beginning to study energy storage tools. Lithium-ion batteries, as an emerging chemical energy storage tool, have been widely studied, with high specific capacity, good cycle stability, and rate performance. Good and other advantages. [0003] At present, carbon materials are mostly used as anode materials for lithium-ion batteries, but their capacity is as low as 370mAh / g. Compared with two-dimensional graphene oxide, the electrochemical performance of three-dimensional graphene oxide has been further improved. The three-dimensional network structure makes it more conductive and stable. At the same time It is al...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/587H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/366H01M4/5815H01M4/587H01M10/0525Y02E60/10
Inventor 黄家锐刘小四刘畅谷翠萍李航宇
Owner ANHUI NORMAL UNIV
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