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Preparation method of cobalt sulfide/graphene nanocomposite material, negative electrode of lithium-ion battery and lithium-ion battery

A nanocomposite material and lithium-ion battery technology, applied in battery electrodes, nanotechnology, nanotechnology, etc., can solve the problems of lithium-ion battery performance degradation, graphene rate performance degradation, and affecting lithium ion transmission, etc., to achieve experimental equipment Low requirements, good cycle performance, easy storage effect

Active Publication Date: 2016-12-07
ANHUI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, graphene also has some problems as a negative electrode material for lithium-ion batteries: graphene is easy to re-stack together due to van der Waals force, which affects the transmission of lithium ions in graphene, which leads to a decrease in the rate performance of graphene.
In terms of graphene composites, the vast majority of graphene composites reported so far are still simple mixtures of graphene and active materials, and the active materials may be separated from graphene after multiple charge-discharge cycles, leading to performance degradation of lithium-ion batteries.

Method used

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  • Preparation method of cobalt sulfide/graphene nanocomposite material, negative electrode of lithium-ion battery and lithium-ion battery
  • Preparation method of cobalt sulfide/graphene nanocomposite material, negative electrode of lithium-ion battery and lithium-ion battery
  • Preparation method of cobalt sulfide/graphene nanocomposite material, negative electrode of lithium-ion battery and lithium-ion battery

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Experimental program
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Effect test

Embodiment 1

[0037] 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, the viscosity of the reactant increased, and the stirring was stopped to obtain a paste-like purple-red substance. After standing for 5 days, slowly add 500mL deionized water and 30mL H 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.

[0038] Hydrothermal process: Dissolve 70mg graphene oxide in 80mL deionized water, add 7mL concentrated sulfuric acid (ρ=1.84g / cm 3 ), ultrasonically dispersed for 2 hours, and then the solution was transferred to a reactor, and reacted at a constant temperature of 160 ° C for 24 hours to obtain three-dimensional columnar reduced graphene...

Embodiment 2

[0041] The preparation method of graphite oxide is with embodiment 1.

[0042] Hydrothermal process: Dissolve 100mg graphene oxide in 80mL deionized water, add 8mL concentrated sulfuric acid (ρ=1.84g / cm 3 ), ultrasonically dispersed for 3 hours, and then the solution was transferred to a reaction kettle, and reacted at a constant temperature of 210 ° C for 20 hours to obtain three-dimensional columnar reduced graphene oxide, which was washed and collected.

[0043] Composite process: 0.5g cobalt nitrate, 0.4g L-cysteine, and 0.6g urea are dissolved in a mixed solvent (4mL water and 12mL DMF), and 20mg three-dimensional columnar reduced graphene oxide is added to the above mixed solution, Soak at 15°C for 1 day, then transfer it to a reactor, react at a constant temperature of 210°C for 30 hours, wash the product, dry it in vacuum at 40°C for 8 hours, and collect cobalt sulfide / graphene nanocomposites.

Embodiment 3

[0045] The preparation method of graphite oxide is with embodiment 1.

[0046] Hydrothermal process: Dissolve 90mg graphene oxide in 80mL deionized water, add 9mL concentrated sulfuric acid (ρ=1.84g / cm 3 ), ultrasonically dispersed for 4 hours, then moved the solution into a reaction kettle, and reacted at a constant temperature of 260°C for 20 hours to obtain a three-dimensional columnar reduced graphene oxide, which was washed and collected.

[0047] Composite process: 0.45g cobalt chloride, 0.30g thioacetamide, and 0.30g urea are dissolved in a mixed solvent (8mL water and 8mL DMF), and 18mg three-dimensional columnar reduced graphene oxide is added to the above mixed solution, 30 ℃ for 3 days, then transferred to a reaction kettle, reacted at a constant temperature of 180 ℃ for 22 hours, washed the product, dried in vacuum at 70 ℃ for 5 hours, and collected cobalt sulfide / graphene nanocomposites.

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Abstract

The invention discloses a preparation method of a cobalt sulfide / graphene nanocomposite material, a negative electrode of a lithium-ion battery and the lithium-ion battery. The preparation method comprises a hydrothermal process and a composition process. According to the preparation method, cobalt sulfide carries out composite in-situ growth on the surface of three-dimensional reduced graphene oxide, so that the material is unique in shape and form, and has very large specific surface area; and falling between the cobalt sulfide and graphene is effectively prevented in the lithiation process. Above all, the problem of aggregation of graphene and cobalt sulfide nanoparticles is solved to a great extent; and the disadvantages that a negative electrode material is relatively poor in stability, relatively poor in conductivity and the like are well overcome, so that the target of improving the performance of the lithium battery is achieved.

Description

technical field [0001] The invention relates to the technical field of inorganic nanomaterials, in particular to a preparation method of a cobalt sulfide / graphene nanocomposite material, a negative electrode of a lithium ion battery, and a lithium ion battery. Background technique [0002] At present, the problem of energy failure is becoming more and more prominent, and it is urgent to find suitable energy storage tools. As an emerging electric energy storage technology, lithium-ion batteries have been widely studied. Lithium-ion batteries have high operating voltage (3.7V), high specific energy, and self-discharge. Low efficiency, no memory effect, long cycle life, good storage performance and meet the development requirements of communication and information technology for miniaturization, light weight and high energy storage equipment. [0003] The research on lithium-ion batteries is mainly aimed at the research on its electrode materials. At present, the anode material...

Claims

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Application Information

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IPC IPC(8): H01M4/58H01M4/583H01M4/1393H01M4/1397H01M10/0525B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/1393H01M4/1397H01M4/362H01M4/5815H01M4/583H01M10/0525Y02E60/10
Inventor 黄家锐刘小四张文谷翠萍
Owner ANHUI NORMAL UNIV
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