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Coral-like strip-shaped porous carbon as well as preparation method and application thereof

A technology of porous carbon and coral, applied in the field of its preparation, coral-like strip-shaped porous carbon, can solve the problems of difficult to realize large-scale preparation of electrode materials, increase the cost of electrode materials, and cannot be applied in a large scale, and achieve fast lithium storage reaction power The effect of improving energy density and service life, and stabilizing structure

Pending Publication Date: 2021-12-03
SHANDONG ENERGY GRP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The chemical vapor deposition method has high requirements for raw materials, generally in the gas phase, and high requirements for equipment, which are generally resistant to high temperature, high pressure and corrosion. The preparation conditions are harsh, and it is difficult to achieve large-scale preparation of electrode materials; hard template method operation It is simple and has low requirements for equipment, but it needs to add chemical reagents to remove the remaining template after calcination, which greatly increases the operating cost; for the soft template method, although it does not need to add reagents to remove the template, it has higher requirements for carbon precursors, and at the same time The price of the soft template is high, which increases the cost of the electrode material preparation process, so it cannot be applied on a large scale

Method used

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  • Coral-like strip-shaped porous carbon as well as preparation method and application thereof
  • Coral-like strip-shaped porous carbon as well as preparation method and application thereof
  • Coral-like strip-shaped porous carbon as well as preparation method and application thereof

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preparation example Construction

[0042] For this reason, the application firstly provides a preparation method of coral-like strip-shaped porous carbon, comprising the following steps:

[0043] Mix coal tar pitch and template activator, and calcine at high temperature to obtain coral-like strip-shaped porous carbon;

[0044] The template activator is potassium bicarbonate.

[0045] The preparation method of the porous carbon described in the present invention has universal applicability, and can carry out the preparation of the kilogram-scale porous carbon-based material at the same time, and the prepared carbon material has the hierarchical channel structure of micropore and mesopore composite, so the porous carbon material prepared by the present invention Compared with graphite in the negative electrode of lithium-ion batteries / capacitors, carbon materials have better lithium storage capacity, exhibit higher lithium storage specific capacity, and can greatly improve the energy density and cycle life of com...

Embodiment 1

[0065] This embodiment provides a preparation method of strip-shaped porous carbon (HPC-3), the preparation method of the porous carbon (HPC-3), comprising the following steps:

[0066] (1) Weigh 1.0 g of coal tar pitch and 3.0 g of potassium bicarbonate, grind them in a 250 mL agate mortar for 10 min, and mix well;

[0067] (2) Transfer the obtained mixture into a 20mL corundum boat, place it in a horizontal tube furnace filled with nitrogen and raise the temperature to 800°C at a heating rate of 5°C / min and keep it for 120min;

[0068] (3) When the temperature of the tube furnace is lowered to room temperature, transfer the product obtained after calcination to a 250mL beaker, add an appropriate amount of water to remove the remaining carbonate after calcination, and then transfer the product obtained by vacuum filtration to a 60°C oven After drying for 24 hours, the final product was obtained, named HPC-3.

[0069] figure 1 and figure 2 The scanning electron microscope ...

Embodiment 2

[0074] This embodiment provides a preparation method of strip-shaped porous carbon (HPC-2), the preparation method of the porous carbon (HPC-2) comprises the following steps:

[0075] (1) Weigh 1.0 g of coal tar pitch and 2.0 g of potassium bicarbonate, grind them in a 250 mL agate mortar for 10 min, and mix well;

[0076] (2) Transfer the obtained mixture into a 20mL corundum boat, place it in a horizontal tube furnace filled with nitrogen and raise the temperature to 800°C at a heating rate of 5°C / min and keep it for 120min;

[0077] (3) When the temperature of the tube furnace is lowered to room temperature, transfer the product obtained after calcination to a 250mL beaker, add an appropriate amount of water to remove the remaining carbonate after calcination, and then transfer the product obtained by vacuum filtration to a 60°C oven After drying for 24 hours, the final product was obtained, named HPC-2.

[0078] Figure 6 and Figure 7 The scanning electron micrograph o...

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Abstract

The invention provides a preparation method of coral-like strip-shaped porous carbon, which comprises the following steps: mixing coal pitch and a template activator, and calcining at high temperature to obtain the coral-like strip-shaped porous carbon. The invention also provides the porous carbon. The invention further provides application of the coral-like strip-shaped porous carbon. The raw material is hard coal pitch which is a byproduct in the coal hot working process, and the ultrahigh carbon content enables the prepared carbon-based material to have higher carbon yield, so that the carbon-based material is an ideal carbon precursor capable of realizing large-scale application; meanwhile, the coral-like strip-shaped porous carbon material is stable in structure and high in defect degree, so that higher lithium storage specific capacity and faster lithium storage reaction kinetics are shown, the energy density of a commercial lithium ion battery / capacitor can be greatly improved, and therefore, the service life of the commercial lithium ion battery / capacitor can be greatly prolonged.

Description

technical field [0001] The invention relates to the technical field of lithium-ion secondary batteries, in particular to coral-like strip-shaped porous carbon, its preparation method and application. Background technique [0002] With the rapid development of economy and the aggravation of environmental pollution, people's demand and research on clean energy are increasing day by day. In order to achieve continuous and efficient storage and conversion of energy, electrochemical energy storage devices with excellent energy storage performance have attracted extensive attention and research. Lithium-ion batteries with graphite as the negative electrode and lithium iron phosphate as the positive electrode are widely used in the market, and are widely used in electric vehicles, mobile phones and other electric devices. [0003] So far, the anode materials of commercial lithium-ion batteries are mainly graphite, while the cathode materials are mainly lithium iron phosphate. How...

Claims

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Application Information

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IPC IPC(8): C01B32/348C01B32/33H01M4/587H01M10/0525
CPCC01B32/348C01B32/33H01M4/587H01M10/0525Y02E60/10
Inventor 吴明铂张梦迪邢涛刘海燕钱通刘昭斌苑文菡韩嘉牟佳伟董志亮张奎同
Owner SHANDONG ENERGY GRP
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