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Method for preparing molybdenum disulfide/graphene nanometer composite materials, lithium ion battery and cathode thereof

A nano-composite material, lithium-ion battery technology, applied in battery electrodes, secondary batteries, nanotechnology and other directions, can solve the problems of lithium-ion battery performance decline, graphene rate performance decline, poor conductivity of molybdenum disulfide, etc. Small size, good cycle performance, and low requirements for experimental equipment

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

[0003] The two-dimensional sheet structure of molybdenum disulfide provides the possibility for better intercalation of lithium ions. At the same time, molybdenum disulfide has a relatively high specific capacity (1334mAh / g), but due to poor conductivity and poor cycle stability of molybdenum disulfide limit its development
[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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  • Method for preparing molybdenum disulfide/graphene nanometer composite materials, lithium ion battery and cathode thereof
  • Method for preparing molybdenum disulfide/graphene nanometer composite materials, lithium ion battery and cathode thereof
  • Method for preparing molybdenum disulfide/graphene nanometer composite materials, lithium ion battery and cathode thereof

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Experimental program
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Effect test

Embodiment 1

[0038] 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.

[0039] Hydrothermal process: Dissolve 70mg graphene oxide in 80ml deionized water, add 7ml 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 190 ° C for 23 hours to obtain a three-dimensional columnar reduced graphene oxide ...

Embodiment 2

[0042] The preparation method of graphite oxide is with embodiment 1.

[0043] Hydrothermal process: Dissolve 120mg graphene oxide in 80ml deionized water, add 6ml concentrated sulfuric acid (ρ=1.84g / cm 3 ), ultrasonically dispersed for 2 hours, and then transferred to a reaction kettle, and reacted at a constant temperature of 160 ° C for 20 hours to obtain three-dimensional columnar reduced graphene oxide oxide, which was washed and collected.

[0044] Composite process: Dissolve 0.5g ammonium molybdate, 0.4g thioacetamide, and 0.5g urea into a mixed solvent (4ml water and 12ml DMF), add 24mg three-dimensional reduced graphene oxide to the above mixed solution, 10°C Soak for 1 day, then transfer it to a reaction kettle, react at a constant temperature of 200°C for 18 hours, wash the product, dry it in vacuum at 30°C for 12 hours, and collect the molybdenum disulfide / graphene composite material.

Embodiment 3

[0046] The preparation method of graphite oxide is with embodiment 1.

[0047] Hydrothermal process: Dissolve 90mg graphene oxide in 80ml deionized water, add 9ml 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 260 ° C for 30 hours to obtain three-dimensional columnar reduced graphene oxide, which was washed and collected.

[0048] Composite process: Dissolve 0.6g sodium molybdate, 0.7g thiourea, and 0.6g urea into a mixed solvent (12ml water and 4ml ethanol), add 18mg three-dimensional reduced graphene oxide to the above mixed solution, soak at 30°C for 3 Then transfer it to the reaction kettle, react at a constant temperature of 180°C for 30 hours, wash the product, dry it in vacuum at 40°C for 12 hours, and collect the molybdenum disulfide / graphene composite material.

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Abstract

The invention discloses a method for preparing molybdenum disulfide / graphene nanometer composite materials, a lithium ion battery and a cathode thereof. The method includes a hydrothermal working procedure and a composite working procedure. The method, the lithium ion battery and the cathode have the advantages that lamellar molybdenum disulfide can directly grow on the surfaces of graphene in an in-situ manner, and accordingly the molybdenum disulfide / graphene nanometer composite materials are unique in morphology and have large specific surface areas, and the problem of graphene and molybdenum disulfide agglomeration can be solved; the molybdenum disulfide / graphene nanometer composite materials applied to cathode materials for the lithium ion battery are good in cycle stability and high in specific energy density, and the like.

Description

technical field [0001] The invention relates to the technical field of inorganic nanometer materials, in particular to a preparation method of a molybdenum disulfide / graphene nanocomposite material, a negative electrode of a lithium ion battery, and a lithium ion battery. Background technique [0002] As the environment is deteriorating and energy issues are becoming increasingly prominent, research on lithium-ion energy storage materials has become increasingly normalized in recent years. As an emerging energy storage tool, lithium-ion batteries can make full use of renewable energy while solving its limited problems. Lithium-ion batteries are low in cost, good in energy storage capacity, high in conversion efficiency, and good in cycle stability. [0003] The two-dimensional sheet structure of molybdenum disulfide provides the possibility for better intercalation of lithium ions. At the same time, molybdenum disulfide has a relatively high specific capacity (1334mAh / g), bu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/583H01M4/62H01M4/1393H01M4/1397H01M4/36H01M10/0525C01B31/04B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/1393H01M4/1397H01M4/362H01M4/58H01M4/583H01M4/625H01M10/0525Y02E60/10
Inventor 黄家锐刘小四谷翠萍陈玉
Owner ANHUI NORMAL UNIV
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