文献类型：期刊文献

英文题名：A high-rate lithium-sulfur battery assisted by nitrogen-enriched mesoporous carbons decorated with ultrafine La2O3 nanoparticles

作者：Sun, Fugen[1];Wang, Jitong[1];Long, Donghui[1];Qiao, Wenming[1];Ling, Licheng[1];Lv, Chunxiang[2];Cai, Rong[2]

机构：[1]E China Univ Sci & Technol, State Key Lab Chem Engn, Coll Chem Engn, Shanghai 200237, Peoples R China;[2]Chinese Acad Sci, Inst Coal Chem, Natl Engn Lab Carbon Fiber Preparat Technol, Taiyuan 030001, Peoples R China

年份：2013

卷号：1

期号：42

起止页码：13283

外文期刊名：JOURNAL OF MATERIALS CHEMISTRY A

收录：;EI(收录号：20134316892451);WOS:【SCI-EXPANDED(收录号:WOS:000325577300033)】；

语种：英文

外文关键词：Carbon - Lithium - Mesoporous materials - Nanoparticles - Nitrogen - Reaction kinetics - Scaffolds - Sulfur

摘要：Nitrogen-enriched mesoporous carbons (NMCs) were decorated with ultrafine La2O3 nanoparticles via a simple wet impregnation method. The resulting composites with well developed mesoporous structures, high nitrogen content and uniform dispersions of La2O3 nanoparticles served as scaffolds to house sulfur for high rate lithium-sulfur batteries. Apart from their on-site trapping of polysulfides, the La2O3 nanoparticles decorated on the mesoporous carbon framework were also found to have a strong catalytic effect on sulfur reduction, offering high discharge voltages and fast electrochemical reaction kinetics. Combining the multiple effects of the well developed mesopores, nitrogen doping and La2O3 nanoparticles, the resulting ternary NMC/La2O3/S nanocomposites can deliver an initial capacity of 1043 mA h g(-1) at 1 C, which remains at 799 mA h g(-1) after 100 cycles. Moreover, they still maintain ultra-high rate capacities of 579 and 475 mA h g(-1) at 3 C and 5 C, respectively, after 100 cycles. These encouraging results suggest that other metal oxides with suitable adsorption and catalytic abilities can be widely applied to decorate carbon frameworks for use in high rate lithium-sulfur systems.