Three-dimensional porous MnO/C-N nano-composite material based on rape pollen, preparing method thereof and application thereof

A nanocomposite material and three-dimensional porous technology are applied to three-dimensional porous MnO/C-N nanocomposite materials based on rape pollen and their preparation and application fields, which can solve problems such as limitations and achieve low cost, simple preparation method and stability. high effect

Inactive Publication Date: 2015-12-09
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method is still limited in improving the performance of lithium intercalation

Method used

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  • Three-dimensional porous MnO/C-N nano-composite material based on rape pollen, preparing method thereof and application thereof
  • Three-dimensional porous MnO/C-N nano-composite material based on rape pollen, preparing method thereof and application thereof
  • Three-dimensional porous MnO/C-N nano-composite material based on rape pollen, preparing method thereof and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] This embodiment prepares the MnO / C-N nanocomposite material according to the following steps:

[0030] At room temperature, weigh a quantitative amount of KMnO 4 , add 250.0mL deionized water to dissolve, and obtain KMnO with a concentration of 0.225mol / L 4 solution; 4 g rapeseed pollen was dispersed in KMnO 4 solution, stirred at room temperature for 8 hours. Then filter the product, wash it once with deionized water and ethanol, and then dry it under vacuum at 80°C; finally, it was calcined at 500°C for 15.0°C under an argon atmosphere with 5% hydrogen to obtain the product MnO / C-N nanocomposite material, Labeled as MnO / C-N.

[0031] In order to compare the influence of stirring time, high-temperature calcination temperature and high-temperature calcination time on the product, a comparison sample was prepared in the same way as above, and the comparison sample was marked as MnO / C-N-x-y-z, where the values ​​of x, y, and z were respectively the values ​​of the comp...

Embodiment 2

[0042] In this embodiment, the sample prepared in embodiment 1 is used to assemble lithium batteries according to the following steps:

[0043] Each sample prepared in Example 1 and pyrolysis pollen (p-R-pollen) were dissolved in n-methyl-2-pyrrolidone with acetylene black and polyvinylidene fluoride at a mass ratio of 8:1:1, and then spread to Electrodes are formed on the copper foil. The electrode was dried at 80° C. for 12.0 hours under vacuum conditions, and then the above electrode was rolled, cut into a circle with a diameter of 1.0 cm, and placed in a pure argon glove box. The metal lithium foil is used as the auxiliary electrode, the glass fiber is used as the separator, and the concentration of LiPF is 1.0MLiPF at a mass percentage of 1:1:1. 6 The electrolytes of ethylene carbonate, dimethyl carbonate, and diethyl carbonate were used as materials, and button cells were assembled in a glove box.

[0044] Such as Figure 6 As shown in (a), compared to cells assembled...

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Abstract

The invention provides a three-dimensional porous MnO / C-N nano-composite material based on rape pollen, a preparing method thereof and an application thereof. In other words, MnO nanometer micro crystals are assembled in a C-N frame provided by the rape pollen. The preparing method includes the steps that the rape pollen is scattered into a KMnO4 solution, and stirring is carried out at the normal temperature; then filtering, washing and vacuum drying are carried out, high-temperature calcination is carried out, and the nano-composite material is obtained. According to the MnO / C-N nano-composite material, the rape pollen low in price and easy to get serves as raw materials, stirring, soaking and calcination are carried out, the preparing method is simple, and popularization is easy; a lithium ion battery prepared from the MnO / C-N nano-composite material is low in cost, good in lithium ion storage performance and circularity and high in stability, and has the characteristics such as the high rate, and therefore the large application potential is achieved.

Description

technical field [0001] The invention relates to the research field of negative electrode materials for lithium ion batteries, in particular to a three-dimensional porous nanostructured MnO / C-N and its preparation method and application. Background technique [0002] Recently, lithium batteries are regarded as the first choice for power sources of portable devices and electric vehicles, and the performance of lithium batteries mainly depends on its electrode materials, so the development of new electrode materials has attracted great attention. Now, graphite / carbon is widely used as negative electrode material, but the fly in the ointment is its low theoretical capacity (372mAhg -1 ) is not suitable for a new generation of high energy density lithium batteries. Therefore, in the process of its development, the most critical thing is to find new negative electrode materials with low cost, large capacity and long life. [0003] At present, transition metal oxides with high th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/50H01M4/62H01M4/131H01M4/1391H01M10/0525
CPCH01M4/131H01M4/1391H01M4/483H01M4/502H01M4/62H01M10/0525H01M2004/027Y02E60/10
Inventor 俞书宏陈立锋马胜祥冯悦
Owner UNIV OF SCI & TECH OF CHINA
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