Heteroatom-doped hard carbon material and preparation method thereof

Abstract

The invention discloses a heteroatom-doped hard carbon material and a preparation method, and belongs to the field of carbon materials.The preparation method of the heteroatom-doped hard carbon material comprises the following steps that 1, preparing a solvent: stirring to prepare a strong-polarity organic solvent; 2, dissolving: dissolving 2.5 a-3. 5g of bacterial cellulose into the organic solvent in the step 1 to form a uniform suspension; 3, preparing a precursor: stirring and dissolving a g of urea into the turbid liquid in the step 2, then placing the turbid liquid in heating equipment, continuously heating and reacting under the protection of argon, circularly performing suction filtration and washing, and finally drying to obtain nitrogen-doped precursor powder; and 4, carbonizing: placing the precursor powder in the step 3 in calcination equipment, performing high-temperature carbonization under protection of argon, so that the ion diffusion capacity can be improved, the pseudocapacitance proportion is provided, a carbon layer is distorted, electron arrangement is changed, and the conduction capacity of the carbon material is effectively improved.

Description

Technical field [0001] The present invention relates to the field of carbon materials, and more particularly to a heteroatom doped hard carbon material and a preparation method. Background technique [0002] Hard carbon materials are considered to be the most potentially commercialized negative material due to highly reversible comparison capacity, low voltage, and the like. However, there is still a problem of chance performance and failure of failure. Through heteroatom doping or increasing the defect position, the magnification performance can be greatly improved; the biomass raw material has the characteristics of a wide source and low price. Among them, bacterial cellulose is a good carbon source, in order to further improve the electron conductivity, it is necessary to introduce heteroatoms on the base of the carbon material, such as nitrogen. Urea is a cheap feedstock with a rich nitrogen source. [0003] A heteroatom-doped titanium composite material disclosed in CN104992...

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Problems solved by technology

[0004] However, due to the high price of titanium raw materials, the preparation cost of heteroatom-doped hard carbon materials is relatively high. At the same time, the existing heteroatom-doped hard carbon materials still have the problems of poor rate performance and fast attenuation.

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