Graphene [email protected] ordered mesoporous carbon/sulfur nanocomposites as cathode material for high-performance lithium-sulfur batteries
石墨烯[email 保护]订购了介质碳/硫纳米复合材料作为高性能锂-硫电池的阴极材料
摘要:Owing to the high energy density and rich resource,Li–S batteries are now considered as a promising direction in energy storage. Nevertheless,the electrochemical properties of sulfur host materials have been limited by the large volume changes during cycles,the dissolution of polysulfides in an electrolyte,and the insulating properties of lithium polysulfides. Based on the above conclusions,a novel cathode material of graphene nanosheet@spherical ordered mesoporous carbon/sulfur nanocomposite (GNs@s-OMC/S) where s-OMC/S was wrapped by GNs has been synthesized in this article and delivers superior cycle stability. According to the tests,GNs@s-OMC/S provides a capacity of 1159 mAh g−1 at a 0.4 C discharge rate. In addition,even at a high rate of 4 C,the discharge capacity of GNs@s-OMC/S can also remain 767 mAh g−1,representing a fantastic rate performance and high specific capacity. It can be ensured that the narrow channels provided by s-OMC and the graphene entrapment with high conductivity enhance the electrochemical performance of the cathode.'
出版日期:13 November 2020
类型:期刊
刊名:International Journal of Hydrogen Energy
卷号:45
期号:56
页码:32654-32663
年:2020