Preparation method of manganese sulfide/graphene nano composite material, negative electrode of lithium ion battery and lithium ion battery

A nanocomposite material, lithium-ion battery technology, applied in battery electrodes, nanotechnology, nanotechnology and other directions, can solve problems such as poor cycle stability, achieve stable performance, improve performance, and enhance conductivity.

Active Publication Date: 2016-11-23
ANHUI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Aiming at technical problems such as poor cycle stability of manganese sulfide as an electrode material, the invention provides a composite material preparation method with simple process, high yield and low cost

Method used

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  • Preparation method of manganese sulfide/graphene nano composite material, negative electrode of lithium ion battery and lithium ion battery
  • Preparation method of manganese sulfide/graphene nano composite material, negative electrode of lithium ion battery and lithium ion battery
  • Preparation method of manganese sulfide/graphene nano composite material, negative electrode of lithium ion battery and lithium ion battery

Examples

Experimental program
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Effect test

Embodiment 1

[0035] 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.

[0036] Hydrothermal process: Dissolve 70mg graphene oxide in 80mL deionized water, add 9mL concentrated sulfuric acid (ρ=1.84g / cm 3 ), ultrasonically dispersed for 3 hours, then transferred to a reactor, and reacted at a constant temperature of 200°C for 20 hours to obtain three-dimensional columnar reduced graphene oxide, which was washe...

Embodiment 2

[0039] The preparation method of graphite oxide is with embodiment 1.

[0040] Hydrothermal process: Dissolve 70mg graphene oxide in 80mL deionized water, add 9mL concentrated sulfuric acid (ρ=1.84g / cm 3 ), ultrasonically dispersed for 3 hours, then transferred to a reactor, and reacted at a constant temperature of 180°C for 20 hours to obtain three-dimensional columnar reduced graphene oxide, which was washed and collected.

[0041]Composite process: Dissolve 0.13g of manganese sulfate and 0.30g of thioacetamide in a mixed solvent (8mL of ethylene glycol and 8mL of isopropanol), add 18mg of three-dimensional columnar reduced graphene oxide to the above solution, soak at 15°C for 2 day, and then transferred to a reactor, 200 ° C constant temperature reaction for 30 hours, the product was washed, vacuum dried at 60 ° C for 4 hours, and the manganese sulfide / graphene composite material was collected.

Embodiment 3

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

[0044] Hydrothermal process: Dissolve 70mg graphene oxide in 80mL deionized water, add 9mL concentrated sulfuric acid (ρ=1.84g / cm 3 ), ultrasonically dispersed for 3 hours, then transferred to a reactor, and reacted at a constant temperature of 160°C for 20 hours to obtain three-dimensional columnar reduced graphene oxide, which was washed and collected.

[0045] Composite process: Dissolve 0.12g of manganese sulfate and 0.30g of thioacetamide in a mixed solvent (8mL of ethylene glycol and 8mL of isopropanol), add 20mg of three-dimensional columnar reduced graphene oxide to the above solution, soak at 35°C for 3 day, then transferred to the reactor, 200 ° C constant temperature reaction for 20 hours, the product was washed, 60 ° C vacuum drying for 6 hours, and the manganese sulfide / graphene composite material was collected.

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Abstract

The invention discloses a preparation method of a manganese sulfide / graphene nano composite material, a negative electrode of a lithium ion battery and the lithium ion battery. The preparation method comprises the steps of a hydrothermal procedure and a compounding procedure. By virtue of the preparation method, in-situ growth of manganese sulfide is directly carried out on the surface of graphene; after washing and drying steps are carried out, the manganese sulfide / graphene nano composite material is obtained; the disadvantages such as poor stability caused by volume change are overcome through compounding of the manganese sulfide and three-dimensional reduced graphene oxide are overcome and the conductivity is enhanced, so that the properties of the lithium ion battery are improved; the material is applied to a negative electrode material of the lithium ion battery and has the advantages of good circulating stability, high 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 manganese sulfide / graphene nanocomposite material, a negative electrode of a lithium ion battery, and a lithium ion battery. Background technique [0002] Lithium-ion batteries are widely used in portable electronic devices due to their high energy density, long cycle life and no memory effect. In recent years, the development of electric equipment has put forward higher requirements for the power density and energy density of lithium-ion batteries, and electrode materials are the decisive factors for the performance improvement of lithium-ion batteries. [0003] The theoretical specific capacity of manganese sulfide is 616mAh / g, which has the advantages of low cost, high specific capacity and easy synthesis. However, as the negative electrode active material of lithium batteries, manganese sulfide has poor electrical conductivity ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/583H01M4/62H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/364H01M4/5815H01M4/583H01M4/625H01M10/0525Y02E60/10
Inventor 黄家锐刘东旭谷翠萍盛恩宏
Owner ANHUI NORMAL UNIV
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