点击次数：

论文类型：期刊论文

发表时间：2019-08-01

发表刊物：CHINESE JOURNAL OF CHEMISTRY

收录刊物：SCIE

卷号：37

期号：8

页面范围：775-780

ISSN号：1001-604X

摘要：We demonstrate the synthesis of cathode material with nanosized sulfur by a precipitation method making use of the alterable solubility of chitosan (CTS) in aqueous solution. Mesoporous Ketjen Black (KB) and carbon nanotube (CNT) are added as conductive agents to provide the three-dimensional electric channels. This method can reduce the size of the sulfur particles, thus the nanosized sulfur obtained can fully contact with the conductive agent, which could increase the utilization of sulfur and improve the capacity of Li-S batteries. Moreover, CTS with abundant hydroxyl and amine groups has strong interaction with polysulfides, which can improve the stability of Li-S batteries. As a result, the obtained CTS/C-S cathode containing 76 wt% sulfur delivers an impressively initial discharge specific capacity of 1141.6 mA center dot h center dot g(-1) at 0.5 C and maintains a capacity of 842.3 mA center dot h center dot g(-1) after 300 cycles. Our finding paves a way for the rational design of high-performance sulfur cathodes for advanced Li-S batteries.