Method for preparing biomass activated carbon and application of biomass activated carbon to lithium sulfur batteries

A technology of activated carbon and biomass, which is applied to battery electrodes, secondary batteries, circuits, etc., can solve the problems of low sulfur utilization rate, unfavorable electrode materials, and no consideration of the influence of pore structure on the electrochemical performance of batteries, etc., to achieve Rich specific surface area, sufficient chemical reaction, and good capacity retention

Inactive Publication Date: 2016-03-23
XIANGTAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, none of the above methods has focused on the influence of the pore structure on the electrochemical performance of the battery.
Activated carbon obtained from different raw materials will have different pore structures, some of which are not suitable for efficient electrochemical reactions in batteries. One of the important reasons is that sulfur is absorbed into activated carbo

Method used

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  • Method for preparing biomass activated carbon and application of biomass activated carbon to lithium sulfur batteries
  • Method for preparing biomass activated carbon and application of biomass activated carbon to lithium sulfur batteries
  • Method for preparing biomass activated carbon and application of biomass activated carbon to lithium sulfur batteries

Examples

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Embodiment 1

[0041] Step 1: Pretreatment of raw materials

[0042] Crush a certain quality of peanut shells into granules with a particle size of ≤5mm, wash them in distilled water to remove dust and other impurities, and dry them in medium until the mass is no longer reduced. Take a certain amount of the peanut shells, with a mass fraction of 20 % ZnCl 2 The solution is mixed at a mass ratio of material to liquid of 1:4, packaged and soaked for 24 hours, transferred to a ceramic crucible, placed in a freezer, and frozen at minus 20°C for 60 hours.

[0043] Step 2: Preparation of Activated Carbon

[0044] Take out the frozen mixture, cover it and quickly put it into a muffle furnace with an initial temperature of about 100°C, heat it to 550°C at a rate of 10°C / min, keep it at this temperature for 2 hours, and let it cool naturally to Take it out after about 100°C, and let it cool down to room temperature naturally. The resulting product was taken out, and soaked in dilute hydrochloric a...

Embodiment 2

[0052] Step 1: Pretreatment of raw materials

[0053] Crush a certain quality of peanut shells into granules with a particle size of ≤5mm, wash them in distilled water to remove dust and other impurities, and dry them until the mass is no longer reduced. Take a certain amount of the peanut shells, with a mass fraction of 15% ZnCl 2 The solution was mixed at a material-to-liquid mass ratio of 1:5, packaged and soaked for 24 hours, the mixture was transferred to a ceramic crucible, placed in a freezer, and frozen at minus 30°C for 48 hours.

[0054] Step 2: Preparation of Activated Carbon

[0055] Take out the frozen mixture, cover it and quickly put it into a muffle furnace with an initial temperature of about 100°C, heat it to 500°C at a rate of 10°C / min, keep it at this temperature for 3 hours, and let it cool naturally to Take it out after about 100°C, and let it cool down to room temperature naturally. The resulting product was taken out and soaked in dilute hydrochloric...

Embodiment 3

[0060] Step 1: Pretreatment of raw materials

[0061] Crush a certain amount of walnut shells into granules with a particle size of ≤5mm, wash them in distilled water to remove dust and other impurities, and dry until the mass is no longer reduced. Take a certain amount of the walnut shells, with a mass fraction of 25% ZnCl 2 The solution was mixed at a material-to-liquid mass ratio of 1:3, packaged and soaked for 24 hours, the mixture was transferred to a ceramic crucible, placed in a freezer, and frozen at minus 25°C for 48 hours.

[0062] Step 2: Preparation of Activated Carbon

[0063] Take out the frozen mixture, cover it and quickly put it into a resistance furnace with an initial temperature of about 100°C, heat it to 650°C at a rate of 15°C / min, keep it at this temperature for 1.5 hours, and let it cool naturally to 100°C After about ℃, take it out and cool to room temperature. The resulting product was taken out and soaked in dilute hydrochloric acid with a mass fr...

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Abstract

The invention discloses a method for preparing biomass activated carbon and application of the biomass activated carbon to lithium sulfur batteries. The method includes crushing natural plant materials, soaking the natural plant materials in zinc chloride solution and then freezing the natural plant materials until the natural plant materials are in solid states; carbonizing solid at high temperatures to obtain the biomass activated carbon with rich pores, large specific surface areas and flat, narrow and long macroporous structures. The method and the application have the advantages that the biomass activated carbon and sulfur can be combined with each other to obtain biomass activated carbon/sulfur composite anode materials, anodes further can be manufactured, and the lithium sulfur batteries are high in sulfur active substance utilization rate, specific discharge capacity and coulomb efficiency and good in circulation stability when the biomass activated carbon is applied to the lithium sulfur batteries.

Description

technical field [0001] The invention relates to a preparation method of biomass activated carbon with a flat, narrow and long pore structure, and the application of the biomass activated carbon in lithium-sulfur battery cathode materials, belonging to the field of lithium-sulfur batteries. Background technique [0002] In today's world, the development of electric vehicles is in the ascendant, and the bottleneck of its development lies in power batteries. The current lithium-ion battery, the specific capacity of the positive electrode material can reach up to 200mAh / g, and the battery energy density can reach up to about 250Wh / kg, which is far from meeting the further development of electric vehicles. Lithium-sulfur battery is a new generation of battery system. The specific capacity of sulfur is as high as 1675mAh / g. With lithium sheet as the negative electrode, the energy density of the battery is as high as 2600Wh / kg. It is an ideal power battery system. In addition, sul...

Claims

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Application Information

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IPC IPC(8): C01B31/12H01M4/587H01M10/0525
CPCC01P2004/03C01P2004/61H01M4/587H01M10/0525Y02E60/10
Inventor 潘勇陈鸿伟雷维新成娟娟朱岭李磊王文轩
Owner XIANGTAN UNIV
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