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Universal electrode material for lithium-sulfur battery and preparation method thereof

A general-purpose electrode and composite material technology, applied in battery electrodes, lithium batteries, negative electrodes, etc., can solve the problems of dendrite growth, sulfur positive electrode shuttle effect, etc., and achieve the effect of low cost and simple preparation process

Pending Publication Date: 2020-11-06
INT ACAD OF OPTOELECTRONICS AT ZHAOQING SOUTH CHINA NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The object of the present invention is to provide a general electrode material for lithium-sulfur battery and its preparation method in view of the above-mentioned defects. Problems such as dendrite growth on one side

Method used

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  • Universal electrode material for lithium-sulfur battery and preparation method thereof
  • Universal electrode material for lithium-sulfur battery and preparation method thereof
  • Universal electrode material for lithium-sulfur battery and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0031] The general electrode material for lithium-sulfur batteries is a dense and highly ordered three-dimensional graphene solid composite material.

[0032] The preparation method of described universal electrode material, comprises the following steps:

[0033] (1) Preparation of graphene hydrogel: first add 21 mL of deionized water to 9 mL of graphene oxide dispersion with a concentration of 10 mg / mL, stir for 0.5 h, and dilute to a concentration of 3 mg / mL; Add 0.202 g of KOH solution with a concentration of 0.12 mol / L to the olefin dispersion, stir continuously at room temperature for 1 hour, then transfer the mixed solution to a 50 mL autoclave and heat it at 180 ° C for 6 hours. After the reactor cools down, graphite is obtained. Alkene hydrogel;

[0034] (2) Preparation of graphene solid composite material: first, the graphene hydrogel obtained in step (1) is rinsed with an aqueous hydrochloric acid solution of 1mol / L for 3 to 4 times to remove residual KOH, and then...

Embodiment 2

[0037] The preparation method of the general electrode material is characterized in that it comprises the following steps:

[0038] (1) Preparation of graphene hydrogel: first add 21 mL of deionized water to 9 mL of graphene oxide dispersion with a concentration of 10 mg / mL, stir for 0.5 h, and dilute to a concentration of 3 mg / mL; Add 0.168 g of KOH solution with a concentration of 0.10 mol / L to the olefin dispersion, stir continuously at room temperature for 1 hour, then transfer the mixed solution to a 50 mL autoclave and heat it at 180 ° C for 6 hours. After the reactor cools down, graphite is obtained. Alkene hydrogel;

[0039] (2) Preparation of graphene solid composite material: first, the graphene hydrogel obtained in step (1) is rinsed with an aqueous hydrochloric acid solution of 1mol / L for 3 to 4 times to remove residual KOH, and then the residual hydrochloric acid is removed by dialysis; Finally, the treated graphene hydrogel was dried in a vacuum oven at 55° C. f...

Embodiment 3

[0042] The preparation method of the general electrode material is characterized in that it comprises the following steps:

[0043] (1) Preparation of graphene hydrogel: first add 21 mL of deionized water to 9 mL of graphene oxide dispersion with a concentration of 10 mg / mL, stir for 0.5 h, and dilute to a concentration of 3 mg / mL; Add 0.252 g of KOH solution with a concentration of 0.15 mol / L to the olefin dispersion, stir continuously at room temperature for 1 hour, then transfer the mixed solution to a 50 mL autoclave and heat it at 180°C for 6 hours. After the reaction kettle cools down, graphite is obtained. Alkene hydrogel;

[0044] (2) Preparation of graphene solid composite material: first, the graphene hydrogel obtained in step (1) is rinsed with an aqueous hydrochloric acid solution of 1mol / L for 3 to 4 times to remove residual KOH, and then the residual hydrochloric acid is removed by dialysis; Finally, the treated graphene hydrogel was dried in a vacuum oven at 55...

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Abstract

The invention belongs to the technical field of lithium-sulfur batteries, and particularly relates to a universal electrode material for a lithium-sulfur battery and a preparation method thereof. Theuniversal electrode material is a compact and highly-ordered three-dimensional graphene solid composite material. The material is a universal electrode material, can solve the problems of shuttle effect and the like on one side of a sulfur positive electrode, and can also solve the problems of dendritic crystal growth and the like on one side of a lithium negative electrode. The universal electrode material has high conductivity and high specific surface area, can maintain a stable structure in an electrolyte, and has important significance for research of a lithium-sulfur battery. The preparation method is simple, effective and easy to operate.

Description

technical field [0001] The invention belongs to the technical field of lithium-sulfur batteries, and in particular relates to a general-purpose electrode material for lithium-sulfur batteries and a preparation method thereof. Background technique [0002] With the rapid development of modern science and technology, the capacity of commercially available batteries is basically close to its theoretical limit, and it is difficult to meet the increasing demand for environmentally friendly and high-energy-density secondary batteries in the current society. Therefore, seeking and developing a new generation of low-cost secondary battery materials with high energy density, long cycle life and environmental friendliness has become a current research hotspot. In many research fields, lithium-sulfur battery has become one of the most promising energy storage systems. It is a lithium secondary battery composed of elemental sulfur as the positive electrode and metal lithium as the negat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M10/052
CPCH01M4/625H01M4/628H01M10/052H01M2004/027Y02E60/10
Inventor 王新刘加兵
Owner INT ACAD OF OPTOELECTRONICS AT ZHAOQING SOUTH CHINA NORMAL UNIV
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