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Preparation method for stannic disulfide/graphene nanocomposite, negative electrode of lithium ion battery, and lithium ion battery

A nano-composite material, lithium-ion battery technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of graphene rate performance decline, affecting lithium ion transport in graphene, and lithium-ion battery performance degradation. Good cycle performance, low requirements for experimental equipment and easy storage

Inactive Publication Date: 2016-11-16
ANHUI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

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 for stannic disulfide/graphene nanocomposite, negative electrode of lithium ion battery, and lithium ion battery
  • Preparation method for stannic disulfide/graphene nanocomposite, negative electrode of lithium ion battery, and lithium ion battery
  • Preparation method for stannic disulfide/graphene nanocomposite, negative electrode of lithium ion battery, and lithium ion battery

Examples

Experimental program
Comparison scheme
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 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.

[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 160°C for 30 hours to obtain three-dimensional columnar reduced graphene oxide, which was washed...

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 0.45g of tin tetrachloride and 0.40g of thioacetamide in 16mL of isopropanol as an organic solvent, add 16mg of three-dimensional columnar reduced graphene oxide into the above solution, soak at 25°C for 2 days, and then transfer Put it into a reaction kettle, react at a constant temperature of 180°C for 30 hours, wash the product, dry it in vacuum at 70°C for 4 hours, and collect the tin disulfide / graphene nanocomposite material.

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 200°C for 22 hours to obtain three-dimensional columnar reduced graphene oxide, which was washed and collected.

[0045] Composite process: Dissolve 0.56g of tin tetrachloride and 0.48g of thioacetamide in 16mL of isopropanol as an organic solvent, add 18mg of three-dimensional columnar reduced graphene oxide into the above solution, soak at 15°C for 3 days, and then transfer Put it into a reaction kettle, react at a constant temperature of 210°C for 28 hours, wash the product, dry it in vacuum at 60°C for 4 hours, and collect the tin disulfide / graphene nanocomposite material.

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Abstract

The invention discloses a preparation method for a stannic disulfide / graphene nanocomposite, a negative electrode of a lithium ion battery, and the lithium ion battery. The preparation method comprises the following steps of performing a hydrothermal process and a compounding process. By adoption of the preparation method, the stannic disulfide is subjected to direct in-situ growth on the surface of graphene; then the obtained stannic disulfide is washed and dried to obtain the sheet-shaped stannic disulfide / graphene nanocomposite; the material is applied to the negative electrode material of the lithium ion battery; the stability and the conductivity of the material are effectively improved; the performance of the battery is improved; and the stannic disulfide / graphene nanocomposite has the advantages of high cycling stability, 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 tin disulfide / 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 depletion is becoming increasingly prominent, and it is urgent to find suitable energy storage tools. In recent years, due to environmental pollution and lack of energy resources, all countries are trying to find new green, environmentally friendly and sustainable energy sources. Lithium-ion batteries are the most versatile and widely adaptable secondary batteries so far, with the advantages of high energy density, long cycle life, and high operating voltage. [0003] The use of graphene composite materials as lithium-ion battery electrode materials is mainly to use its excellent electrical conductivity to improve the rate performance and conductivity of e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/583H01M4/62H01M4/133H01M4/136H01M10/0525
CPCH01M4/133H01M4/136H01M4/364H01M4/5815H01M4/583H01M4/625H01M10/0525Y02E60/10
Inventor 黄家锐刘东旭谷翠萍高绿绿
Owner ANHUI NORMAL UNIV
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