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Preparation method and application of biomass-based porous carbon/sulfur composite

A technology of porous carbon materials and composite materials, applied in the field of preparation of porous carbon/sulfur composite materials, can solve the problems of underutilized value, difficult to meet a large number of needs, complicated and tedious preparation process, etc., and achieves good activation effect, high The effect of carbon yield and good application prospect

Inactive Publication Date: 2017-07-25
HUAZHONG UNIV OF SCI & TECH
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  • Abstract
  • Description
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Problems solved by technology

However, when these materials are used in lithium-sulfur batteries, there are still the following problems: (1) the preparation process is complicated and cumbersome, (2) the production cost is high and it is difficult to meet a large amount of demand, (3) because the porosity is not high, there are sulfur-loaded The power is not high, the battery capacity is not high enough
[0011] Wood chips, chestnut shells, melon seed shells, lotus leaves and other biomass materials are resources that widely exist in nature, and have high application prospects in the field of porous carbon preparation. At present, most of the waste biomass is treated by landfill or incineration. way, so that its value is not fully utilized

Method used

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  • Preparation method and application of biomass-based porous carbon/sulfur composite
  • Preparation method and application of biomass-based porous carbon/sulfur composite
  • Preparation method and application of biomass-based porous carbon/sulfur composite

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preparation example Construction

[0046] The invention provides a method for preparing a biomass porous carbon / sulfur composite electrode material, comprising the following steps:

[0047] S1. Wash the prepared biomass raw material with water, and dry it at a temperature of 60°C to 150°C for 12h to 24h to remove dust and other inorganic impurities on the surface of the biomass material; then dry the biomass raw material in an inert atmosphere Among them, roasting at 400℃~600℃ for 1h~3h can obtain the primary product of biomass carbon material; among them, the temperature and roasting time have an impact on the product, the temperature is too high or the time is too long will lead to excessive carbonization, and the carbon yield If the temperature is too low or the carbonization time is too short, it will lead to insufficient carbonization of the material, which is not conducive to the subsequent activation process.

[0048] S2. After naturally cooling the initial product of the carbon material in step S1, firs...

Embodiment 1

[0059] (1) Wash 5 g of waste sawdust with water and dry at 60°C for 24 hours to obtain 4.9 g of dry matter;

[0060] (2) Heating the dried product to 500°C at 5°C / min in a nitrogen atmosphere, keeping the temperature at a constant temperature for 1.5h, and cooling naturally to obtain the primary product of carbon material;

[0061] (3) Then, it was treated with dilute hydrochloric acid (10wt%), and then the initial product of the carbon material was washed with deionized water to neutrality, and 3.4 g of the product was obtained after drying;

[0062] (4) Evenly mix the dried product with KOH and water at a mass ratio of 1:3:15, and fully dry it, then heat it up to 800°C at 5°C / min for 2h in a nitrogen atmosphere, and then natural cooling;

[0063] (5) The activated product was then washed with dilute hydrochloric acid (10wt%), then washed with deionized water until neutral and dried to obtain 2.1 g of wood chip-based porous carbon material;

[0064] (6) Fully mix the prepar...

Embodiment 2

[0068](1) Wash 6 g of melon seed shells with water and dry at 90°C for 22 hours to obtain 5.8 g of dry matter;

[0069] (2) Heating the dried product to 600°C at a rate of 5°C / min in a nitrogen atmosphere and keeping the temperature constant for 1 hour, then cooling naturally to obtain the primary carbon material product;

[0070] (3) Then, it was treated with dilute hydrochloric acid (12wt%), and then the initial product of the carbon material was washed with deionized water to neutrality, and 4.8 g of the product was obtained after drying;

[0071] (4) Evenly mix the dried product with KOH and water at a mass ratio of 1:1:5, and fully dry it, then heat it up to 600°C at 5°C / min for 5 hours in a nitrogen atmosphere, and then natural cooling;

[0072] (5) The activated product was then washed with dilute hydrochloric acid (12wt%), then washed with deionized water until neutral and dried to obtain 3.5 g of wood chip-based porous carbon material;

[0073] (6) Fully mix the pre...

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Abstract

The invention belongs to the field of lithium-sulfur battery cathode materials and particularly relates to a preparation method of a preparation method of biomass-based porous carbon / sulfur composite, comprising the specific steps of S1, calcining biomass material to obtain a primary product of carbon material; S2, removing impurities from the primary product of carbon material to obtain biomass carbon material; S3, mixing well the biomass carbon material with an activator and water, and calcining to obtain activated mixture; S4, removing impurities from the mixture to obtain activated porous carbon material; S5, mixing the porous carbon material with sulfur for the purpose of reacting to obtain the porous carbon / sulfur composite. The invention also discloses application of the porous carbon / sulfur composite as a cathode material in batteries or supercapacitors. A battery prepared with the biomass carbon / sulfur composite prepared herein has high discharge capacity, good cycle stability and high coulombic efficiency, and has a promising application.

Description

technical field [0001] The invention belongs to the field of cathode materials for lithium-sulfur batteries, and more specifically relates to a preparation method and application of a biomass-based porous carbon / sulfur composite material. Background technique [0002] Lithium-ion battery is one of the most advanced secondary battery systems at present. Since its commercialization in 1990, it has been widely used in mobile communications and electric tools due to its advantages such as high voltage, high energy density, long cycle life, and no memory effect. , portable computers and many other fields, and is considered to have great potential for emerging large-scale applications such as electric vehicles and smart grids in the future. [0003] However, with the development and progress of science and technology, some emerging applications, such as electric vehicles, smart phones, large-scale energy storage power stations, etc., have also put forward higher and higher require...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/052H01G11/30H01G11/44H01G11/86
CPCH01G11/30H01G11/44H01G11/86H01M4/362H01M4/38H01M4/62H01M4/625H01M10/052Y02E60/10Y02E60/13
Inventor 胡敬平武龙胜袁喜庆薛伟俊杨小容何雨航贺秀林侯慧杰
Owner HUAZHONG UNIV OF SCI & TECH
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