生物基碳载硫正极材料的性能  

Performance of biomass-derived carbons/sulfur cathode materials

作　　者：权亚彤 谢慧慧 韩东梅[2] 冯玉红[1,3] QUAN Ya-tong;XIE Hui-hui;HAN Dong-mei;FENG Yu-hong(Department of Materials and Chemical Engineering,Hainan University,Haikou,Hainan 570228,China;The Key Laboratory of Low-carbon Chemistry ＆ Energy Conservation of Guangdong Province,Sun Yat-sen University,Guangzhou,Guangdong 510275,China;State Key Laboratory of Marine Resource Utilization of South China Sea,Haikou,Hainan 570228,China)

机构地区：[1]海南大学材料与化工学院,海南海口570228 [2]中山大学广东省低碳化学与过程节能重点实验室,广东广州510275 [3]南海海洋资源利用国家重点实验室,海南海口570228

出　　处：《电池》2018年第4期215-219,共5页Battery Bimonthly

基　　金：国家自然科学基金(21366010;21566009);海南省自然科学基金(20162013;20162016);海南省重点科技计划(cxy20150026)

摘　　要：采用具有超精细网络结构、良好分子取向、高结晶度和高聚合度等特性的细菌纤维素(BC)为基体碳源,通过添加KOH活化剂,在300℃预碳化2 h后,再在900℃碳化2 h,制备氮掺杂的具有较高比表面积(1 479 m^2/g)、孔分布范围广(0.2~5.0 nm)的分层次多孔碳纤维材料(NPC)。将硫单质通过熔融注入到NPC孔洞中,获得S-NPC复合材料。以复合正极材料组装电池,在1.5~2.7 V充放电,0.1 C首次放电比容量达1 137 mAh/g,经500次循环,比容量为890 mAh/g。平均每次循环,容量仅衰减约0.1%,且库仑效率高于98%。Using bacterial cellulose （BC） with ultra-fine network structure, excellent molecular orientation, high crystallinity and degree of polymerization as the base carbon source, the nitrogen-doped hierarchical porous carbon fiber material （NPC） was prepared,which had a relatively high specific surface area （1 479 m2/g） and a large pore distribution （0.2 -5.0 nm） by precarbonization at 300 ℃ for 2 h with the addition of KOH activator and followed by 900 ℃ carbonization for 2 h. S-NPC composites were obtained by melting sulfur into NPC pores. The S-NPC composite as the cathode exhibited an initial specific discharge capacity of 1 137 mAh/g at 0. 1 C in 1.5 - 2. 7 V. It still maintained 890 mAh/g after 500 cycles. The average decay rate in a cycle was only 0. 1% , the Coulombic efficiency was above 98 %.

关 键 词：锂硫电池 细菌纤维素碳化 多孔碳纤维材料(NPC) 氮掺杂 

分 类 号：TM912.9[电气工程—电力电子与电力传动]