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Hard carbon material and preparing method and application thereof

A hard carbon and pyrolysis reaction technology, applied in the field of materials, can solve the problems of complex preparation methods of flake hard carbon, and achieve the effects of source of raw materials, economy, good electrochemical performance and wide distribution

Inactive Publication Date: 2018-09-28
ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In view of this, the present invention provides a hard carbon material and its preparation method and application, which are used to solve the relatively complicated problem of the existing sheet-like hard carbon preparation methods

Method used

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  • Hard carbon material and preparing method and application thereof
  • Hard carbon material and preparing method and application thereof
  • Hard carbon material and preparing method and application thereof

Examples

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preparation example Construction

[0030] A kind of preparation method of hard carbon material, comprises the following steps:

[0031] The citric acid is placed in a protective atmosphere, and the pyrolysis reaction is carried out to obtain a hard carbon material.

[0032] After heating, citric acid will undergo polymolecular linear polycondensation to form higher molecular weight linear compounds, or undergo intramolecular dehydration to form rings, and polymerize between ring molecules to form higher molecular weight polymers. During the pyrolysis reaction, citric acid is melted, dehydrated, polymerized, and finally pyrolyzed into a hard carbon material with a two-dimensional structure.

[0033] The present invention directly adopts citric acid to carry out a one-step pyrolysis reaction under a protective atmosphere, and prepares a hard carbon material with a unique sheet structure and a large number of micropores and mesopores, and uses the hard carbon material as a negative electrode active material to pre...

Embodiment 1

[0054] Put 50g of citric acid monohydrate in a tube furnace, and carry out pyrolysis reaction under argon atmosphere. The pyrolysis reaction includes heating up to 900°C at a heating rate of 5°C / min, keeping at 900°C for 2h, and cooling to room temperature naturally. A hard carbon material 1 (number: NCS-900C 2h) was obtained.

Embodiment 2

[0056] Put 50g of citric acid monohydrate in a tube furnace, and carry out pyrolysis reaction under an argon atmosphere. The pyrolysis reaction includes heating up to 1100°C at a heating rate of 5°C / min, keeping at 1100°C for 2h, and naturally cooling to room temperature. A hard carbon material 2 (number: NCS-1100C 2h) was obtained.

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Abstract

The invention belongs to the field of materials, and particularly relates to a hard carbon material and a preparing method and application thereof. The preparing method of the hard carbon material comprises the following step of placing citric acid in a protective atmosphere for a pyrolytic reaction to obtain the hard carbon material. The citric acid is directly adopted for the further pyrolytic reaction in the protective atmosphere, the hard carbon material which is of a unique sheet structure and contains a large number of microporous and mesoporous structures is prepared, and a lithium ionbattery negative electrode prepared with the hard carbon material being an active negative electrode substance has good electrochemical performance. The preparing method is simple and feasible, the citric acid does not need to be pretreated and is spontaneously polymerized in the pyrolytic process, the technology can be simplified to the greatest extent, and the preparing cost of the hard carbon material is greatly lowered; moreover, the citric acid has a very wide distribution range in nature, the synthesis technology is mature, and raw materials are rich in source and economical.

Description

technical field [0001] The invention belongs to the field of materials, and in particular relates to a hard carbon material and its preparation method and application. Background technique [0002] Hard carbon materials are amorphous carbon materials that are difficult to graphitize, and are formed by the disordered arrangement of graphite crystallites. Different from graphite materials, the storage mechanism of lithium ions in hard carbon materials includes the intercalation-extraction mechanism between graphite crystallite layers and the adsorption-desorption mechanism in the micropores and surfaces of hard carbon materials. Its capacity, cycle performance and rate performance all have important influences. There are abundant sources of precursors for preparing hard carbon materials, such as sugars, aromatic compounds, lipid compounds, and high molecular polymers. Hard carbon materials can be obtained by heat-treating these precursors. The patent document with applicatio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/05H01M4/62
CPCC01B32/05H01M4/625Y02E60/10
Inventor 徐凯琪李蕴莎钟国彬苏伟
Owner ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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