Preparation method and application of sulfur positive electrode of full-wood structure

A technology of sulfur positive electrode and wood structure, applied in the direction of positive electrode, structural parts, battery electrodes, etc., can solve the problems of large volume strain, achieve the effects of alleviating volume effect, improving utilization rate, and easy availability of raw materials

Active Publication Date: 2019-08-23
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims to solve the shortcomings of the prior art that the positive electrode of the lithium-sulfur battery will have a large volume strain during charging and discharging, and the "shuttle effect" between the positive and negative electrodes will occur, and provide a brand new lithium-sulfur battery. Positive electrode structure and its preparation method and application

Method used

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  • Preparation method and application of sulfur positive electrode of full-wood structure
  • Preparation method and application of sulfur positive electrode of full-wood structure
  • Preparation method and application of sulfur positive electrode of full-wood structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Step 1: Preparation of the all-wood structure sulfur cathode

[0038] S1. Pretreatment of the carrier

[0039] Get a section of pine as a carrier, process it into a cylindrical shape with a suitable diameter (the suitable diameter means that the outer diameter of the cylindrical carrier matches the inner diameter of the protective sleeve made in step S4), then immerse it in a 2.5mol / L In the sodium hydroxide solution, keep boiling state 12h, wash with distilled water 3 times subsequently, obtain the columnar wooden block carrier that removes organic matter;

[0040] S2, carbonization of the carrier

[0041] The wood block carrier was placed in a tube furnace, and when the tube furnace was filled with an air atmosphere, it was heated to 250 °C at a heating rate of 5 °C / min. After the temperature reached, the carrier was pre-carbonized for 6 h; When the type furnace is filled with argon atmosphere, it is heated up to 1000 °C at a heating rate of 5 °C / min. After the temp...

Embodiment 2

[0053] Step 1: Preparation of the all-wood structure sulfur cathode

[0054] S1. Pretreatment of the carrier

[0055] Get a section of teak as a carrier, process it into a cylindrical shape with a suitable diameter (the suitable diameter means that the outer diameter of the cylindrical carrier matches the inner diameter of the protective sleeve made in step S4), and then immerse it in a 1.5mol / L In the sodium hydroxide solution, keep boiling state 10h, rinse with distilled water 2 times subsequently, obtain the columnar wooden block carrier that removes organic matter;

[0056] S2, carbonization of the carrier

[0057] The wood block carrier was placed in a tube furnace, and when the tube furnace was filled with an air atmosphere, it was heated to 300 °C at a heating rate of 5 °C / min. After the temperature reached, the carrier was pre-carbonized for 7 h; When the furnace is filled with nitrogen atmosphere, it is heated to 1200°C at a heating rate of 5°C / min. After the temper...

Embodiment 3

[0069] Step 1: Preparation of the all-wood structure sulfur cathode

[0070] S1. Pretreatment of the carrier

[0071] Get a section of maple as a carrier, process it into a cylindrical shape with a suitable diameter (the suitable diameter means that the outer diameter of the cylindrical carrier matches the inner diameter of the protective sleeve made in step S4), then immerse it in 4.5mol / In the potassium hydroxide solution of 1, keep boiling state 10h, rinse with distilled water 3 times subsequently, obtain the columnar wooden block carrier that removes organic matter;

[0072] S2, carbonization of the carrier

[0073] The wood block carrier was placed in a tube furnace, and when the tube furnace was filled with an air atmosphere, it was heated to 200 °C at a heating rate of 5 °C / min. After the temperature reached, the carrier was pre-carbonized for 5 h; When the furnace is filled with argon atmosphere, it is heated to 900°C at a heating rate of 5°C / min. After the temperat...

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Abstract

The invention relates to a preparation method and application of a cylindrical sulfur positive electrode of a full-wood structure, and belongs to the technical field of lithium-sulfur battery positiveelectrode materials. The invention provides the brand-new lithium-sulfur battery positive electrode structure and the preparation method and application thereof in order to overcome the defects thatin the prior art, a lithium-sulfur battery positive electrode can generate large volume strain in the charging and discharging process, a shuttle effect can occur between the positive electrode and the negative electrode, and the like. A porous cylindrical wood block carrier obtained through carbonization treatment is employed, and the porous cylindrical wood block carrier has rich long and thin micro-channels, so the loading capacity of sulfur can be remarkably improved, the volume effect generated in the charging and discharging process can be relieved, and the damages to the electrode structure are reduced; in addition, a carbon material skeleton is used as a conductive network, so that the conductivity of the positive electrode material can be improved, and the cycle stability and ratecapability of the battery are improved; the protective sleeve prepared by the invention can be used as an electrode diaphragm, and also has a certain inhibition effect on the shuttle effect of polysulfide.

Description

technical field [0001] The invention relates to a preparation method and application of a cylindrical sulfur positive electrode with an all-wood structure, and belongs to the technical field of lithium-sulfur battery positive electrode materials. Background technique [0002] At present, the manufacturing cost of lithium batteries is high, and the energy density cannot meet the daily needs of users. Among them, the cost of lithium batteries largely depends on the cathode material, accounting for about 30% to 40% of the total manufacturing cost. Therefore, it is imminent to find new cathode materials with high energy density and low cost. [0003] Lithium-sulfur battery is a secondary battery composed of lithium metal as the negative electrode and elemental sulfur or sulfur compound as the positive electrode material. The theoretical specific capacity of sulfur is as high as 1675mA h g -1 , and the theoretical specific capacity of lithium metal is as high as 3860mA h g -1...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/139H01M4/38H01M10/052
CPCH01M4/139H01M4/38H01M10/052H01M2004/028Y02E60/10
Inventor 夏阳任强卢成炜张文魁黄辉甘永平张俊梁初贺馨平
Owner ZHEJIANG UNIV OF TECH
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