Lithium-sulfur battery sulfur/carbon composite positive electrode material, preparation method and applications thereof

A technology for lithium-sulfur batteries and positive electrode materials, which can be used in battery electrodes, lithium batteries, non-aqueous electrolyte battery electrodes, etc., can solve problems such as atmospheric environmental pollution, and achieve the effect of simple method, improvement of environmental pollution problems, and good cycle stability

Active Publication Date: 2013-08-07
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In particular, straw, rice husk, and wood and bamboo processing residues are often treated as waste for simple incineration, causing pollution to the atmospheric environment.
However, there are no literature or patent reports that carbonize plants such as rice husks to prepare sulfur / carbon composite materials and use them as positive electrodes for lithium-sulfur batteries.

Method used

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  • Lithium-sulfur battery sulfur/carbon composite positive electrode material, preparation method and applications thereof
  • Lithium-sulfur battery sulfur/carbon composite positive electrode material, preparation method and applications thereof
  • Lithium-sulfur battery sulfur/carbon composite positive electrode material, preparation method and applications thereof

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Experimental program
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Effect test

Embodiment 1

[0043] Preparation of sulfur / carbon composite material: After washing and drying rice husks, carbonization treatment was carried out at 900° C. for 1 hour under an argon atmosphere. The cooled carbonized rice husk is ground and pulverized into 100 nm-50 μm particles. The powder material was stirred in 0.5 mol / L sodium hydroxide solution at room temperature for 4 hours to remove silicon oxides in the carbonized product. After filtering the sodium hydroxide solution to obtain the carbon material, and after further washing with water, the carbon material is dried, and the scanning electron microscope photo is as follows: figure 1 As shown, the specific surface area of ​​the prepared sample reaches 1000 m 2 / g or more. The dried carbon material and sulfur are mixed evenly according to the mass ratio of 3:2, and then the mixture is heated to 100°C under vacuum conditions, kept for 24 hours, and the sulfur / carbon composite material is obtained after cooling. The content of sulfur...

Embodiment 2

[0049] The washed and dried rice husks were kept at 600° C. for 10 hours under an argon atmosphere to carry out carbonization treatment. The cooled carbonized product was ball milled and stirred in 10 mol / L potassium hydroxide solution at 100°C for 0.5 hour to remove silicon oxide in the product. The solid washed with potassium hydroxide solution is further washed with water and then dried to obtain a carbon material, and the carbon material is further heated to 1500 ° C in a vacuum environment and kept for 1 hour to increase the crystallinity of the carbon material, thereby improving the carbon material. conductivity. The further calcined carbon material is cooled and mixed evenly with sulfur element according to the mass ratio of 3:2, and then the mixture is heated to 600°C for 2 hours in an argon atmosphere, and the sulfur / carbon composite material is obtained after cooling. The sulfur in the composite material The content is about 40% by mass.

[0050] Positive electrode...

Embodiment 3

[0054] The washed and dried rice husks are kept at 1100° C. for 1 hour under vacuum conditions for carbonization treatment. The cooled carbonized rice husk is ground and pulverized. The powder material was heated to 80°C with 5 mol / L sodium hydroxide solution and stirred for 2 hours to remove silicon oxides in the carbonized product. The carbon material is obtained after filtering the sodium hydroxide solution, and the carbon material is washed with water and then dried. Then, the carbon material is further heated to 1800° C. for 24 hours under a nitrogen atmosphere to increase the crystallinity of the carbon material. The further calcined carbon material and sulfur element are uniformly mixed according to the mass ratio of 3:2, the mixture is heated to 200°C under vacuum conditions, kept for 10 hours, and the sulfur / carbon composite material is obtained after cooling. The sulfur content in the composite material is about 40% by mass.

[0055] Positive plate preparation met...

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Abstract

The present invention belongs to the field of lithium ion battery positive electrode materials and lithium ion batteries, and particularly relates to a lithium ion battery positive electrode material and a preparation method thereof, a positive electrode adopting the material, and a lithium ion battery adopting the positive electrode. The lithium-sulfur battery sulfur / carbon composite positive electrode material preparation method comprises: mixing sulfur and carbon through a ball milling method or a stirring method, carrying out heat preservation on the obtained mixture for 0.5-24 h at a temperature of 100-600 DEG C in vacuum, argon or nitrogen atmosphere, and cooling to obtain the sulfur / carbon composite material, wherein a carbon-containing biomass material is adopted as a carbon source, and is subjected to carbonization to obtain the used carbon, the used sulfur is elemental sulfur, and a mass ratio of the sulfur to the carbon in the composite material is (0.4-5):1. With application of the prepared sulfur / carbon composite material as the lithium ion battery positive electrode material, first discharge capacity can be 1300-1600 mAhg<-1>, and capacity after 200 cycles can be 620 mAhg<-1>.

Description

technical field [0001] The invention belongs to the field of lithium battery electrode materials and lithium batteries, and in particular relates to a lithium-sulfur battery positive electrode material and a preparation method thereof, a positive electrode using the material, and a lithium-sulfur battery using the positive electrode. Background technique [0002] Lithium-ion batteries are increasingly used in modern life. It has been widely used in daily life mobile power sources such as notebook computers and household appliances. Due to the increasing shortage of traditional fossil energy and the need of human beings to protect the environment, the requirements for the use of lithium ions in the power supply of electric vehicles and hybrid vehicles are increasing, and the demand for storage of unstable energy such as wind energy and solar energy is also increasing. In the past 20 years, lithium cobalt oxide (LiCoO 2 ) are widely used commercially. The theoretical capaci...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/052H01M4/1393H01M4/13H01M4/133H01M4/139
CPCY02E60/122Y02E60/10
Inventor 潘洪革李想高明霞刘永锋
Owner ZHEJIANG UNIV
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