Energy Storage Science and Technology ›› 2021, Vol. 10 ›› Issue (6): 2060-2068.doi: 10.19799/j.cnki.2095-4239.2021.0153

• Energy Storage Materials and Devices • Previous Articles     Next Articles

Preparation and research of carbonized agaric material for sulfur cathodes

Chunshui SUN1,2(), Decai GUO1, Jian CHEN1()   

  1. 1.Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, Liaoning, China
    2.University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2021-04-12 Revised:2021-04-27 Online:2021-11-05 Published:2021-11-03

Abstract:

Carbon materials with adjustable pore structure and surface chemical properties were prepared at different carbonization temperatures using freeze-dried agaric as a precursor. The measured results show that carbon materials prepared at carbonization temperatures ranging from 450—650 ?℃ have oxygen-containing functional groups without pore structure. While carbon materials prepared at 800—900 ?℃ contain the amount of microporous and mesoporous (795 m2/g) without surface groups. Carbon materials were used as sulfur hosts to prepare carbon-sulfur composite materials to analyze the relationship between the structural properties of the carbon materials and the electrochemical properties of the C/S composites. It was found that LD900 material with plenty of microporous and mesoporous shows three discharge platforms due to the limitation of microporous structure towards sulfur-containing species. However, the micropores and small mesopores are easily blocked during the cycle process, resulting in LD900-S's poor cycle stability. While the LD450 has plenty of polar oxygen-containing functional groups, it has plenty of chemisorption towards sulfur-containing species. In addition, the prepared LD450-S cathode exhibits improved cycle stability and rate performance. After 100 cycles at 0.1 C, the specific discharge capacity is 577 mA·h/g, and at 1 C, the specific discharge capacity is still 650 mA·h/g.

Key words: lithium sulfur battery, porous carbon, agaric

CLC Number: