期刊
SMALL
卷 15, 期 10, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.201804806
关键词
anodes; hybrid structure engineering; potassium-ion batteries; tin sulfide; ultrathin nanosheets
类别
资金
- National Natural Science Foundation of China [51772154, 51572129, 51702164]
- Natural Science Foundation of Jiangsu Province [BK20170036, BK20170844]
- International S&T Cooperation Program of China [2016YFE0111500]
- Six Talent Peaks Project of Jiangsu Province [2018-XNY-025]
Anodes involving conversion and alloying reaction mechanisms are attractive for potassium-ion batteries (PIBs) due to their high theoretical capacities. However, serious volume change and metal aggregation upon potassiation/depotassiation usually cause poor electrochemical performance. Herein, few-layered SnS2 nanosheets supported on reduced graphene oxide (SnS2@rGO) are fabricated and investigated as anode material for PIBs, showing high specific capacity (448 mAh g(-1) at 0.05 A g(-1)), high rate capability (247 mAh g(-1) at 1 A g(-1)), and improved cycle performance (73% capacity retention after 300 cycles). In this composite electrode, SnS2 nanosheets undergo sequential conversion (SnS2 to Sn) and alloying (Sn to K4Sn23, KSn) reactions during potassiation/depotassiation, giving rise to a high specific capacity. Meanwhile, the hybrid ultrathin nanosheets enable fast K storage kinetics and excellent structure integrity because of fast electron/ionic transportation, surface capacitive-dominated charge storage mechanism, and effective accommodation for volume variation. This work demonstrates that K storage performance of alloy and conversion-based anodes can be remarkably promoted by subtle structure engineering.
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