Legume-shaped carbon-coated manganese oxide core-shell structure composite material and preparation method and application thereof

A composite material and core-shell structure technology, applied in structural parts, electrical components, battery electrodes, etc., can solve the problems of low initial charge and discharge efficiency, excessive potential platform difference, etc., achieve excellent electrochemical performance, buffer volume expansion, The effect of improving the magnification performance

Active Publication Date: 2013-09-18
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the first charge-discharge efficiency is lower than 65%, and the potential platform difference between lithium-deintercalation and intercalation during charge-discharge is too large, and its performance needs to be further improved.

Method used

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  • Legume-shaped carbon-coated manganese oxide core-shell structure composite material and preparation method and application thereof
  • Legume-shaped carbon-coated manganese oxide core-shell structure composite material and preparation method and application thereof
  • Legume-shaped carbon-coated manganese oxide core-shell structure composite material and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Dissolve 50mg P123 in water, add 50mg PVP and stir until clear, then add 0.1M KMnO 4 6ml of the solution was stirred evenly, subjected to hydrothermal reaction at 150°C for 8h, cooled to room temperature, washed and collected the reaction product. Dissolve 0.2g of P123 in 200ml of water, then add 0.25g of tromethamine and stir to obtain a buffer solution, then disperse the product obtained above in 100ml of the buffer solution, sonicate for 30min and cool to room temperature. Add 20mg of dopamine to the above solution while stirring, stir and react at room temperature for 5h, filter and wash to collect the reaction product. Then the obtained product was subjected to high-temperature carbonization at 850°C for 2 hours in an argon atmosphere to obtain a pod-shaped carbon-coated manganese oxide core-shell composite material. The XRD curve of the product is as follows: figure 1 Shown, the transmission electron microscope picture of the product is as follows figure 2 show...

Embodiment 2

[0024] Dissolve 50mg P123 in water, add 30mg PVP and stir until clear, then add 0.1M KMnO 4 8ml of the solution was stirred evenly, subjected to hydrothermal reaction at 160°C for 10h, cooled to room temperature, washed and collected the reaction product. Dissolve 0.4g of P123 in 400ml of water, then add 0.5g of tromethamine and stir to obtain a buffer solution, then disperse the product obtained above in 40ml of the buffer solution, sonicate for 60min and cool to room temperature. Add 40 mg of dopamine to the above solution while stirring, stir and react at room temperature for 10 h, filter and wash to collect the reaction product. Then the obtained product was subjected to high-temperature carbonization at 750° C. for 4 hours in an argon atmosphere to obtain a pod-shaped carbon-coated manganese oxide core-shell composite material. The electrochemical test is partly the same as in Example 1, and the prepared material shows almost the same experimental results as in Example 1...

Embodiment 3

[0026] Dissolve 50mg P123 in water, add 80mg PVP and stir until clear, then add 0.1M KMnO 4 20ml of the solution was stirred evenly, subjected to hydrothermal reaction at 180°C for 12h, cooled to room temperature, washed and collected the reaction product. Dissolve 0.6g of P123 in 500ml of water, then add 0.75g of tromethamine and stir to obtain a buffer solution, then disperse the product obtained above in 200ml of the buffer solution, sonicate for 90min and cool to room temperature. Add 80mg of dopamine to the above solution while stirring, stir and react at room temperature for 24h, filter and wash to collect the reaction product. Then, the obtained product was subjected to high-temperature carbonization at 900° C. for 2 h in an argon atmosphere to obtain a pod-shaped carbon-coated manganese oxide core-shell composite material. The electrochemical test is partly the same as in Example 1, and the prepared material shows almost the same experimental results as in Example 1.

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Abstract

The invention discloses a legume-shaped carbon-coated manganese oxide core-shell structure composite material and a preparation method and application thereof. The preparation method comprises the following steps: firstly, with a triblock copolymer polyethylene oxide-polypropylene oxide-polyethylene oxide PEO-PPO-PEO (P123) and polyvinyl pyrrolidone (PVP) as surfactants and potassium permanganate as a manganese source, carrying out hydrothermal reaction so as to obtain a precursor nano wire of manganese; then with dopamine as a carbon source, uniformly wrapping a layer of thin polydopamine on the surface of the precursor, and carbonizing for a certain period at a high temperature so as to prepare the legume-shaped carbon-coated manganese oxide core-shell structure composite material. Due to the wrapping of the carbon layer, the electron conductivity of the manganese oxide is improved; due to the large space among the manganese oxide active material, the volume expansion in the repeated charging and discharging process is effectively buffered; and the electrochemical test result shows that the material serving as a lithium ion battery cathode material has excellent multiplying power and circulation property, and the material is expected to be widely applied to the field of lithium ion batteries.

Description

technical field [0001] The invention belongs to the field of new energy materials, and relates to a lithium-ion battery electrode material and its preparation method and application, in particular to a pod-shaped carbon-coated manganese oxide core-shell composite electrode material. Background technique [0002] In 1991, Sony Corporation of Japan launched the first commercial lithium-ion battery to the market for the first time. Because of its high energy density, long cycle life and other advantages, it occupies an increasingly important position in people's daily life. . With the rapid development of various portable electronic devices, electric vehicles and hybrid vehicles, people have put forward higher requirements on the performance of lithium-ion batteries for energy storage devices. Electrode materials are one of the key problems that lithium-ion batteries need to solve. Lithium-ion battery cathode materials are frequently replaced, from the initial lithium cobalt o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/50H01M4/1391H01M4/62
CPCY02E60/10
Inventor 李春忠江浩付垚岳琦
Owner EAST CHINA UNIV OF SCI & TECH
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