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Preparation method for MoS2@C composite electrode material with lignin as carbon source

A composite electrode and lignin technology, used in electrode manufacturing, battery electrodes, electrode heat treatment, etc., can solve the problems of volume change and unstable electrochemical performance, and achieve the effect of improving contact area, particle uniformity, and avoiding volume change

Active Publication Date: 2017-09-29
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the electrode still has lithium ion intercalation and desorption process to trigger MoS 2 The problem of volume change leads to its actual electrochemical performance is not stable

Method used

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  • Preparation method for MoS2@C composite electrode material with lignin as carbon source
  • Preparation method for MoS2@C composite electrode material with lignin as carbon source
  • Preparation method for MoS2@C composite electrode material with lignin as carbon source

Examples

Experimental program
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Effect test

Embodiment 1

[0029] Dissolve 0.5g of sodium lignosulfonate in 20ml of deionized water, and ultrasonically dissolve. Take 40ml of isopropanol and place it in a 150w ultrasonic water bath, use a 30ml syringe to inject the sodium lignosulfonate aqueous solution into the isopropanol at a speed of 20ml / h by means of an automatic sampler. A suspension of lignin microspheres was obtained. Weigh 0.151g of thiourea and 0.237g of sodium molybdate into the suspension, and place the mixture in an autoclave. The reaction kettle was placed in a high-temperature oven at 180°C for 8 hours of reaction. After cooling, the reactant is centrifuged and washed to obtain lignin microsphere powder with molybdenum disulfide. The product powder was dried in a vacuum oven at 60°C for 24 hours to obtain the dry product MoS 2 @Lignin nanosphere powder. Will dry MoS 2 @Lignin nanosphere powder placed in N 2 Calcined in a tube furnace in the atmosphere (heat up to 300°C at a speed of 5°C / min, then rise to 500°C at...

Embodiment 2

[0031] Others are the same as in Example 1, except that the reaction temperature is 200°C. The resulting MoS 2 @C composite particles have better dispersibility, and the particle diameter is about 1 μm. However, the molybdenum disulfide coating is general.

Embodiment 3

[0033] Others are the same as Example 2, except that the consumption of sodium lignosulfonate is 1g. The resulting MoS 2 The particle diameter of @C composite material is about 1 μm. Molybdenum disulfide is also better coated, Figure 4 b and d are the constant current charge and discharge diagram and specific capacitance diagram of embodiment 3. It can be seen from the figure that the specific capacity retention rate of Example 3 is not high, and its specific capacity decays rapidly with the increase of charge and discharge times.

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Abstract

The invention provides a preparation method for a MoS2@C composite electrode material with lignin as a carbon source. According to the preparation method, sodium lignosulfonate is used as a carbon source; a sample is allowed to become a microsphere under the action of a proper solvent and ultrasonic treatment; then molybdenum disulfide is directly synthesized by using a hydrothermal method and is allowed to grow on the surface of lignin; high-temperature pyrolysis is carried out to prepare a desired molybdenum disulfide-modified porous microsphere carbon material; and the electrochemical performance of the sample is tested and analyzed. The invention has the beneficial effect that the prepared MoS2@C composite electrode material has the characteristics of a high specific surface area, good cycle and heavy-current charging / discharging stability, high specific capacitance, etc.

Description

(1) Technical field [0001] The present invention relates to a kind of MoS with lignin as carbon source 2 Preparation methods of @C composite electrode materials. (2) Background technology [0002] In recent years, research on anode materials for lithium-ion batteries has mainly focused on improving charge and discharge efficiency, improving battery life, and increasing the specific surface area of ​​materials. The current research is mainly on the surface modification of carbon materials, the attachment of nano phases on the surface of negative electrode materials, the formation of nano micropores on the surface, and the application of other nanotechnology. There are many research results in this direction, which also shows that the development prospects of lithium-ion batteries are very promising. [0003] Molybdenum disulfide (MoS 2 ) is used as a lithium-ion battery anode material with a large theoretical capacity, and is a promising electrode material choice; lignin i...

Claims

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Application Information

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IPC IPC(8): H01M4/04H01M4/36H01M4/58
CPCH01M4/0416H01M4/0471H01M4/362H01M4/5815Y02E60/10
Inventor 周泽平魏晓娟陈枫赵正平范萍杨晋涛钟明强
Owner ZHEJIANG UNIV OF TECH
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