Boron-nitrogen co-doped hard carbon material and preparation method thereof

A co-doping, hard carbon technology, applied in the preparation/purification of carbon, structural parts, electrical components, etc., can solve the problems of low battery discharge capacity, unfavorable lithium/sodium ion storage, large crystal layer spacing, etc. The process is simple, the discharge capacity and rate performance are improved, and the effect of improving the adsorption and storage capacity

Active Publication Date: 2022-07-12
SHENZHEN KEXIN COMM TECH
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Problems solved by technology

[0004] Aiming at the technical problems that the existing hard carbon materials have too rich pore structure, large interlayer distance between crystals, unfavorable storage of lithium / sodium ions, and low discharge capacity of batteries prepared from hard carbon materials as negative electrode materials, the present invention provides a boron nitrogen Co-doped hard carbon material and preparation method thereof

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  • Boron-nitrogen co-doped hard carbon material and preparation method thereof
  • Boron-nitrogen co-doped hard carbon material and preparation method thereof

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preparation example Construction

[0036] The present invention provides a method for preparing a boron-nitrogen co-doped hard carbon material, comprising the following steps:

[0037] 1) obtain trisodium citrate, urotropine and boron-containing oxide, mix them evenly, and carry out carbonization reaction under protective atmosphere to obtain composite hard carbon material;

[0038] 2) The composite hard carbon material obtained in step 1) is taken out and washed with an acid solution, and the sodium borate salt by-products in the composite hard carbon material are eluted to obtain a loose and porous boron-nitrogen co-doped hard carbon material.

[0039] Boron doping is a p-type doping, which can effectively reduce the Fermi level of hard carbon materials and enhance the intercalation-extraction ability of metal ions; nitrogen doping can further improve the electrical conductivity of hard carbon materials; compared with single-atom doping The co-doping of boron atoms and nitrogen atoms not only maintains their ...

Embodiment 1

[0064] 1) Weigh trisodium citrate dihydrate, urotropine and boron oxide powder in a mass ratio of 1:1:0.5, and mix them evenly after grinding with a mortar in a fume hood;

[0065] 2) Put the above mixed powder into the ark, put it in a tube furnace, and put it in the Ar / H of 5% hydrogen. 2 Under the mixed atmosphere, the temperature is raised to 800°C at a heating rate of 3°C / min, and the carbonization reaction is carried out, and the carbonization reaction is performed for 2 hours to obtain a composite hard carbon material;

[0066] 3) After natural cooling, the composite hard carbon material prepared in step 2) is taken out from the tube furnace, firstly washed three times with a hydrochloric acid solution with a concentration of 0.1 mol / L, and then washed with anhydrous ethanol for two times. After cleaning, the samples were placed in a blast drying oven and dried at a temperature of 60° C. to obtain a boron-nitrogen co-doped hard carbon material 2 (number: HC-0.5) with a ...

Embodiment 2

[0069] 1) Weigh trisodium citrate dihydrate, urotropine and boric acid powder in a mass ratio of 1:1:1, and mix them evenly after grinding with a mortar in a fume hood;

[0070] 2) Put the above mixed powder into the ark, put it in a tube furnace, and put it in the Ar / H of 5% hydrogen. 2 Under the mixed atmosphere, the temperature is raised to 800°C at a heating rate of 3°C / min, and the carbonization reaction is carried out, and the carbonization reaction time is 2 hours to obtain a composite hard carbon material;

[0071] 3) After natural cooling, the carbon-based composite material prepared in step 2) is taken out from the tube furnace, firstly washed three times with a hydrochloric acid solution with a concentration of 0.1 mol / L, and then twice with anhydrous ethanol. After cleaning, the sample was placed in a blast drying oven and dried at 60° C. to obtain boron-nitrogen co-doped hard carbon material 3 (number: HC-1).

[0072] from image 3 The scanning electron microsco...

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Abstract

The invention provides a boron-nitrogen co-doped hard carbon material and a preparation method thereof in order to solve the technical problems that in the prior art, a hard carbon material is too rich in pore structure and large in crystal layer spacing, storage of lithium/sodium ions is not facilitated, and a lithium/sodium ion battery prepared by taking the hard carbon material as a negative electrode material is low in platform capacity. The preparation method comprises the following steps: obtaining trisodium citrate, urotropine and boron-containing oxide, uniformly mixing, and carrying out carbonization reaction in a protective atmosphere to obtain a composite hard carbon material; the obtained composite hard carbon material is taken out and cleaned with hydrochloric acid and ethyl alcohol in sequence, drying is carried out after cleaning is completed, the boron-nitrogen co-doped hard carbon material with the loose and porous interior is obtained, and the loose and porous structure is more beneficial to improving the adsorption and storage capacity of the material to metal ions/metal compounds and the like; the boron-nitrogen co-doped hard carbon material can be applied to an electrochemical energy storage device so as to improve the discharge capacity and the rate capability of the electrochemical energy storage device.

Description

technical field [0001] The invention relates to the technical field of hard carbon material preparation, in particular to a boron-nitrogen co-doped hard carbon material and a preparation method thereof. Background technique [0002] The specific capacity of graphite anode materials has reached the limit and cannot meet the continuous high current discharge capacity required by large power batteries. Therefore, people have also begun to turn their attention to non-graphite materials, such as hard carbon and other non-carbon materials. Hard carbon materials, belonging to amorphous carbon, usually refer to carbon that is difficult to be completely graphitized above 2800 °C, and its disordered structure is difficult to eliminate at high temperatures. The current preparation technology of hard carbon is mainly realized by medium and high temperature pyrolysis of hard carbon precursors (including macromolecular resins, hydrocarbons and biomass materials, etc.) with abundant oxygen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/05H01M4/587
CPCC01B32/05H01M4/587Y02E60/10
Inventor 朱景辉王挺
Owner SHENZHEN KEXIN COMM TECH
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