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Pyrolytic hard carbon material and application thereof

A technology for pyrolysis of hard carbon and negative electrode materials, applied in the field of materials, can solve the problems of large mass loss, low carbon content, and high cost of hard carbon materials

Active Publication Date: 2016-12-07
INST OF PHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to overcome the problems of low carbon content in the precursors used in the production of hard carbon materials in the prior art, large mass loss and low carbon production rate in the high-temperature carbonization process, resulting in high cost and low performance of hard carbon materials. , in order to solve the above problems, the embodiment of the present invention provides a kind of pyrolytic hard carbon material and application

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  • Pyrolytic hard carbon material and application thereof
  • Pyrolytic hard carbon material and application thereof
  • Pyrolytic hard carbon material and application thereof

Examples

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Embodiment 1

[0038] Embodiment 1 of the present invention provides a kind of pyrolysis hard carbon material, and its preparation method is as follows figure 1 shown, including the following steps:

[0039] (1) Dry the waste biomass.

[0040] Specifically, waste biomass is used as a hard carbon precursor, that is, waste biomass is used as a raw material to prepare pyrolytic carbon materials. Preferably, the waste biomass can be selected from one or more of corn cobs, corn residues, corn stalks and corn husks. In order to remove the moisture in the hard carbon precursor, dry the hard carbon precursor, for example, place the hard carbon precursor in an oven at 50-120°C for 20-30 hours to remove the moisture in the hard carbon precursor. moisture. It should be pointed out that, in order to facilitate drying and subsequent heat treatment, the hard carbon precursor can be pre-pulverized before drying the hard carbon precursor.

[0041] (2) Raise the temperature to 300°C-600°C under an inert ...

Embodiment 2

[0054] Preparation of pyrolytic hard carbon material: cut the corn cobs with the corn kernels removed into small pieces about 1 cm wide, put them in a beaker, and bake them in a constant temperature oven at 80°C for 26 hours. After drying, put it in a porcelain boat of about 5cm*2cm*2cm, ready for high-temperature carbonization.

[0055] Put the corn cob together with the porcelain boat in a tube furnace (the tube is about 100 cm long and 6 cm in diameter, the same tube furnace is used in the following examples), and under the protection of argon, the temperature is raised to 500 °C at a rate of 1 °C / min , with an argon flow rate of 25mL / min, pre-carbonize at 500°C for 2h, then raise the temperature to 1300°C at a rate of 5°C / min, keep the temperature for 2h, and then cool down to room temperature naturally. The carbonized corn segments are taken out and ground into powder in a mortar to obtain pyrolysis hard carbon products. Its X-ray diffraction (XRD) pattern see figure 2...

Embodiment 3

[0060] Preparation of pyrolytic hard carbon material: cut the corncobs from which the corn kernels have been removed into small pieces with a width of about 1 cm, put them in a beaker, and dry them in a constant temperature oven at 50°C for 30 hours. After drying, put it in a porcelain boat of about 5cm*2cm*2cm, ready for high-temperature carbonization.

[0061] Put the corn cob together with the porcelain boat in a tube furnace, under the protection of argon, the temperature was raised to 500°C at a rate of 1°C / min, the flow of argon gas was 25mL / min, preheated at 500°C for 2h, and then heated at 500°C for 5 The temperature was raised to 1000°C at a rate of °C / min, kept for 2 hours, and then cooled to room temperature naturally. The carbonized corncobs are taken out and ground into powder in a mortar to obtain pyrolysis hard carbon products. Its X-ray diffraction (XRD) pattern see Image 6 . The d of the hard carbon material can be obtained from the XRD pattern 002 = 0.40...

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Abstract

The invention discloses a pyrolytic hard carbon material. In one embodiment, the material is prepared by the following steps: drying waste biomass; heating to 300-600 DEG C in an inert atmosphere, and carrying out pre-carbonization for 1-5 hours; heating to 1000-1600 DEG C in an inert atmosphere, carbonizing, and pyrolyzing for 1-10 hours; and cooling to obtain the pyrolytic carbon material. The obtained pyrolytic hard carbon material is irregular blocky particles of which the particle size is 1-20 mu m and the average particle size is 5-10 mu m; and the d002 value is 0.38-0.41nm, the Lc value is 1.3-1.5nm, and the La value is 3.7-4.7nm. The pyrolytic hard carbon material has the advantages of simple preparation process, abundant raw material resources and low cost, and is pollution-free green material. The sodium ion secondary battery prepared by using the pyrolytic hard carbon material as the negative electrode active material has the advantages of higher working voltage, higher energy density, high circulation stability and favorable safety performance, and is applicable to large-scale energy storage facilities for solar power generation, wind power generation, intelligent electric network peak shaving, distribution power stations, backup power sources or communication base stations.

Description

technical field [0001] The invention relates to the technical field of materials, in particular to a pyrolysis hard carbon material and its application. Background technique [0002] With its advantages of high voltage, high energy density and high safety, lithium-ion batteries occupy an irreplaceable position in the field of portable electronic devices, and are rapidly emerging in the field of power batteries. Compared with lithium-ion batteries, sodium-ion batteries have a potential price advantage due to abundant sodium resources, and have broad application prospects in large-scale energy storage systems. [0003] At present, the main negative electrode material of lithium-ion batteries in commercial application is graphite material. For sodium-ion batteries, due to thermodynamic reasons, sodium ions cannot achieve stable reversible deintercalation between graphite layers, so sodium-ion batteries need to find other new materials. as negative electrode material. [0004]...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/02H01M10/054H01M4/133H01M4/587
CPCC01P2002/72C01P2002/82C01P2004/03C01P2004/61H01M4/133H01M4/587H01M10/054Y02E60/10Y02P20/133
Inventor 刘品李云明胡勇胜陈立泉
Owner INST OF PHYSICS - CHINESE ACAD OF SCI
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