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Preparation method for poplar catkin based biomass carbon/sulfur composite material

A composite material, biomass carbon technology, applied in non-aqueous electrolyte batteries, electrical components, battery electrodes, etc., can solve the problems of unsatisfactory electrochemical performance, low capacity of lithium-sulfur batteries, and low sulfur adsorption, and achieve improved Electrochemical performance, good electrochemical performance, low cost effect

Inactive Publication Date: 2016-08-17
HEBEI UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the electrochemical performance of the biocarbon / sulfur composite material prepared by the above technology is not ideal, because the carbon material prepared by it is mechanically mixed with sulfur, the adsorption of sulfur is not large, and the lithium-sulfur battery has low capacity and fast decay.

Method used

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  • Preparation method for poplar catkin based biomass carbon/sulfur composite material
  • Preparation method for poplar catkin based biomass carbon/sulfur composite material
  • Preparation method for poplar catkin based biomass carbon/sulfur composite material

Examples

Experimental program
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Effect test

Embodiment 1

[0022] (1) collect a certain amount of poplar catkins, wash the collected poplar catkins with deionized water 12 times, then place them in a drying oven at 90 degrees and dry for 12 hours to obtain pretreated poplar catkins;

[0023] (2) Immerse the pretreated poplar catkins in a 1mol / L potassium hydroxide solution and stir for 3 hours, wherein the mass ratio is pretreated poplar catkins: KOH contained in the solution=1:2, and then the obtained The substance evaporates water under vacuum conditions, and then fully dried in a drying oven at a drying temperature of 70°C for 12 hours;

[0024] (3) heating the dried alkalized poplar catkins to 700 °C for 1 hour at a heating rate of 5 °C / min in a tube furnace in an inert atmosphere, and performing high-temperature heat treatment to obtain poplar catkin powder;

[0025] (4) Alternately washing the poplar catkin powder after heat treatment with 0.1mol / L dilute hydrochloric acid solution and water to neutrality, and then fully drying ...

Embodiment 2

[0034] (1) collect a certain amount of poplar catkins, wash the collected poplar catkins with deionized water 15 times, then place it in a drying oven for 12 hours at 60 degrees to obtain pretreated poplar catkins;

[0035](2) Immerse the pretreated poplar catkins in 1mol / L potassium hydroxide solution and stir for 5 hours, wherein the mass ratio is to obtain the pretreated poplar catkins: KOH contained in the solution=1:3, and then the obtained The substance evaporated water under vacuum conditions, and then fully dried in a drying oven at a drying temperature of 90°C for 12 hours;

[0036] (3) heating the dried alkalized poplar catkins to 900 °C for 1.5 hours at a heating rate of 5 °C / min in a tube furnace in an inert atmosphere, and performing high-temperature heat treatment to obtain poplar catkin powder;

[0037] (4) Alternately washing the heat-treated poplar catkin powder with 0.5 mol / L dilute hydrochloric acid solution and water until neutral, then fully drying it in a...

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Abstract

The invention discloses a preparation method for a poplar catkin based biomass carbon / sulfur composite material. The preparation method comprises the following steps of (1) enabling pre-processed poplar catkin to be immersed in a potassium hydroxide solution to be stirred for 3-12h, and then drying the obtained material in a drying oven; (2) carrying out high-temperature thermal processing on dried alkalized poplar catkin in a tubular furnace at a temperature of 600-900 DEG C for 1-3h, then washing the processed poplar catkin by a diluted hydrochloric acid solution and water alternately until the poplar catkin is neutral; and next, drying the poplar catkin in the drying oven to obtain carbon micron tube powder; and (3) enabling the carbon micron tube powder to be fully mixed with elementary sulfur and then to be subjected to thermal processing in the tubular furnace to finally obtain the poplar catkin based biomass carbon / sulfur composite material. According to the preparation method, only the simple potassium hydroxide activation method and the thermal processing method are adopted, so that simple process and the commercialized operation can be realized; and meanwhile, the poplar catkin based biomass carbon / sulfur composite material is quite high in electrochemical property, and the initial discharge capacity of the composite material can reach 1200 mAh / g under the current density of 0.1C.

Description

technical field [0001] The invention relates to a preparation method of a biomass carbon / sulfur composite material applied to a lithium-sulfur battery, and belongs to the field of lithium-ion battery cathode materials. Background technique [0002] At present, lithium-ion batteries are widely used in people's work and life. For example, they play an important role in portable electronic products such as mobile phones, digital cameras and notebook computers, electric vehicles, and large-scale energy storage equipment. With the improvement of people's requirements for equipment performance, the traditional lithium-ion battery can no longer meet the demand, so the next-generation lithium-ion battery with high specific capacity, high safety, long service life and low cost has become a research hotspot. [0003] The positive electrode of a lithium-ion battery is the key to increasing the specific capacity of the battery. The theoretical energy density of a lithium-sulfur battery...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/62H01M10/052
CPCH01M4/364H01M4/625H01M10/052Y02E60/10
Inventor 张永光王卓殷福星王新谭台哲
Owner HEBEI UNIV OF TECH
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