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Preparation method for spirogyra-based biomass carbon material/nanometer sulfur composite material

A technology of biomass carbon and composite materials, applied in the direction of nanotechnology, nanotechnology, nanotechnology, etc. for materials and surface science, can solve the problem of poor electronic conductivity and ion conductivity of lithium sulfide, low utilization rate of positive active materials, Short cycle life and other issues, to achieve strong reproduction and adaptability, realize waste reuse, and good uniformity and continuity

Active Publication Date: 2016-07-06
HEBEI UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, there are also some problems with sulfur cathode materials: Lithium-sulfur batteries have problems such as low utilization of cathode active materials, short cycle life, and poor rate performance, which restrict their practical application.
The reasons for these problems are: 1) the electronic conductivity and ionic conductivity of sulfur and the reaction product lithium sulfide are poor, resulting in low utilization of active components and poor rate performance; Lithium sulfide is easy to dissolve in organic electrolyte, causing serious capacity fading

Method used

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  • Preparation method for spirogyra-based biomass carbon material/nanometer sulfur composite material
  • Preparation method for spirogyra-based biomass carbon material/nanometer sulfur composite material
  • Preparation method for spirogyra-based biomass carbon material/nanometer sulfur composite material

Examples

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Effect test

Embodiment 1

[0028] (1) Clean the spongy repeatedly to remove impurities, put it into a beaker and add deionized water to submerge the spongy, then ultrasonically clean for 30 minutes, then replace the cleaning solvent with ethanol and ultrasonically clean for 30 minutes, repeat the above cleaning process Three times (that is, water and ethanol are ultrasonically cleaned in turn, that is, water is washed once, ethanol is washed once; water is washed once, ethanol is washed once; water is washed once, ethanol is washed once. The following examples are the same) until the solution is clarified;

[0029] (2) Place the spongy cleaned in step 1 in a vacuum drying oven and dry at 60°C for 6 hours;

[0030] (3) Heat the spirogyra dried in step 2 through a vacuum tube furnace under the protection of an argon atmosphere, raise the temperature to 700°C at a rate of 5°C / min, keep it warm for 2 hours, and then cool it to room temperature with the furnace to obtain Spirogyne-based biomass carbon materi...

Embodiment 2

[0043] The preparation method of the spirogyra-based biomass carbon / nano-sulfur composite material applied to lithium-sulfur batteries has the same steps as in Example 1, except that the tube furnace in step (3) is heated to 500°C.

[0044] (1) Clean the spongy repeatedly to remove impurities, put it into a beaker and add deionized water to submerge the spongy, then ultrasonically clean for 30 minutes, then replace the cleaning solvent with ethanol and ultrasonically clean for 30 minutes, repeat the above cleaning process Three times until the solution is clear;

[0045] (2) Place the spongy cleaned in step 1 in a vacuum drying oven and dry at 60°C for 6 hours;

[0046] (3) Heat the spirogyra dried in step 2 through a vacuum tube furnace under the protection of an argon atmosphere, raise the temperature to 500°C at a rate of 5°C / min, keep it warm for 2 hours, and then cool it to room temperature with the furnace to obtain Spirogyra-based biomass carbon materials;

[0047] (4...

Embodiment 3

[0054] The preparation method of the spirogyra-based biomass carbon / nano-sulfur composite material applied to lithium-sulfur batteries, the steps are the same as those in Example 1, except that the tube furnace in step (3) is heated to 900°C.

[0055] (1) Clean the spongy repeatedly to remove impurities, put it into a beaker and add deionized water to submerge the spongy, then ultrasonically clean for 30 minutes, then replace the cleaning solvent with ethanol and ultrasonically clean for 30 minutes, repeat the above cleaning process Three times until the solution is clear;

[0056] (2) Place the spongy cleaned in step 1 in a vacuum drying oven and dry at 60°C for 6 hours;

[0057] (3) Heat the spirogyra dried in step 2 through a vacuum tube furnace under the protection of an argon atmosphere, raise the temperature to 900°C at a rate of 5°C / min, keep it warm for 2 hours, and then cool it to room temperature with the furnace to obtain Spirogyra-based biomass carbon materials; ...

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Abstract

The invention relates to a preparation method for a spirogyra-based biomass carbon material / nanometer sulfur composite material. The method comprises the following steps of washing and drying spirogyra, heating the washed and dried spirogyra in a vacuum tubular furnace, carrying out heat preservation and carbonization at 500-900 DEG C, mixing the carbonized spirogyra with nanometer sulfur with ultrasound, carrying out ball milling, drying the ball-milled mixture by an air blow drying box, heating the dried mixture in the vacuum tubular furnace, carrying out heat preservation for 3-6 hours at 100-200 DEG C, and afterwards cooling the mixture subjected to heat preservation to a room temperature with the furnace to obtain the target product, namely the spirogyra-based biomass carbon / nanometer sulfur composite material. According to the preparation method, the spirogyra is taken as a precursor for the first time, and a biomass carbon material with a continuous sheet-shaped structure similar to graphene and with nanoscale thickness is synthesized; the biomass carbon material comprises the sheet-shaped structure composed of continuous fibers, also is provided with nanoscale pores and is high in uniformity and continuity, the loading of sulfur particles is facilitated, and the obtained composite material has favorably electrochemical performance.

Description

technical field [0001] The technical solution of the invention relates to a Spirogyra-based biomass carbon / sulfur composite material and its preparation method and application, and belongs to the field of cathode materials for lithium-sulfur batteries. Background technique [0002] Due to its high specific energy, good safety and many other advantages, lithium-sulfur batteries have received extensive attention from many researchers. The theoretical specific capacity of lithium-sulfur battery is 1675mAh / g, the specific energy can reach 2600Wh / kg, and there are two voltage platforms, which is superior to the general lithium-ion battery and meets the "light, thin and small" requirements of today's electronic products. portable needs. In addition, sulfur reserves are very abundant in nature, the price is relatively cheap, and sulfur is an environmentally friendly element. Therefore, the sulfur cathode material is one of the cathode materials for secondary power lithium batteri...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/052B82Y30/00
CPCB82Y30/00H01M4/364H01M4/38H01M4/625H01M10/052H01M2004/021Y02E60/10
Inventor 张永光刘心怡殷福星王新谭台哲
Owner HEBEI UNIV OF TECH
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