文献类型：期刊文献

英文题名：Ultrafine NbN nanoparticle decorated nitrogen-doped carbon nanosheets with efficient polysulfide catalytic conversion for superior Li-S batteries

作者：Ma, Cheng[1,2,3];Jia, Xianfeng[1,4];Liu, Xiaojun[1];Wang, Jitong[1,2];Qiao, Wenming[1,2];Yu, Jianguo[5];Ling, Licheng[1,2]

机构：[1]East China Univ Sci & Technol, Sch Chem Engn, State Key Lab Chem Engn, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Sch Chem Engn, Key Lab Specially Funct Polymer Mat & Related Tec, Shanghai 200237, Peoples R China;[3]Chinese Acad Sci, Inst Coal Chem, CAS Key Lab Carbon Mat, Taiyuan 030001, Peoples R China;[4]Tangshan Normal Univ, Dept Chem, Tangshan 063000, Peoples R China;[5]East China Univ Sci & Technol, Sch Resources & Environm Engn, Shanghai 200237, Peoples R China

年份：2022

卷号：520

外文期刊名：JOURNAL OF POWER SOURCES

收录：;EI(收录号：20214911276331);WOS:【SCI-EXPANDED(收录号:WOS:000763503400004)】；

基金：This work is supported by the National Natural Science Foundation of China (No. U1710252, 21978097) , CAS Key Laboratory of Carbon Materials (No: KLCMKFJJ2001) , and the Fundamental Research Funds for the Central Universities (JKD01211701) .

语种：英文

外文关键词：Lithium -sulfur battery; Niobium nitride; Porous carbon nanosheets; Polysulfide conversion; Nitrogen doping

摘要：Lithium-sulfur batteries are considered as one of the most promising energy storage systems beyond commercial lithium-ion batteries, but the practical application of lithium-sulfur batteries is still hindered by the severe polysulfides dissolution and sluggish redox reaction kinetics with low areal capacity. Herein, ultrafine NbN decorated nitrogen-doped porous carbon nanosheets are reported via C3N4 sacrifice template using phenolic resol as carbon precursor. The ultrafine NbN nanoparticles and nitrogen-doped carbons guarantee efficient polysulfides trapping and fast redox reaction kinetics even with a high sulfur content of 75 wt%. In addition, porous carbon nanosheets and NbN nanoparticles provide more active sites for Li2S nucleation and serve as a second host for the reuse of sulfur. Hence, the lithium-sulfur cells with NbN@CNS-5 modified multifunctional separator deliver a high initial capacity of 1252 mAh g-1 @ 0.2 C, 683 mAh g-1 @ 4 C, and high capacity retention of 84.5% after 200 cycles at 0.2 C. Furthermore, a high initial capacity of 4.95 mAh cm-2 and 4.01 mAh cm-2 @0.2 C after 200 cycles are achieved at a sulfur loading of 4.2 mg cm-2. These findings open up a new method for the practical application of lithium-sulfur batteries with superior sulfur utilization and a long lifespan.