Confining SnS_(2)@N,S codoped carbon in core-shell beads of necklace-like fibers towards ultrastable anode for flexible potassium-ion battery  

作　　者：Jiaqi Si Xueya Liu Zili Wang Sen Zhang Chao Deng 

机构地区：[1]Key Laboratory for Photonic and Electronic Bandgap Materials,Ministry of Education,College of Chemistry and Chemical Engineering,Harbin Normal University,Harbin 150001,Heilongjiang,China [2]College of Materials Science and Chemical Engineering,Harbin Engineering University,Harbin 150001,Heilongjiang,China

出　　处：《Journal of Energy Chemistry》2023年第1期349-358,I0009,共11页能源化学（英文版）

基　　金：supported by the Natural Science Foundation of Heilongjiang Province of China(No.TD2020B001);the Opening Project of State Key Laboratory of Advanced Chemical Power Sources(No.SKL-ACPS-C-25)。

摘　　要：Tin sulfide(SnS_(2))with high theoretical capacity and layered structure is a promising anode candidate for potassium-ion batteries(PIBs).However,the sluggish kinetics,huge volume expansion and polysulfide intermediates dissolution restrict its development.To address these issues,a necklace-like hybrid fiber with core–shell beads is designed to achieve the high-performance anode for PIBs.The cores of the beads are assembly by SnS_(2)nanocrystals dotted in N,S codoped carbon(NSC)matrix.Then they are encapsulated by NSC based shell and form the core–shell structured beads internal the hybrid fiber(CSN fiber).The carbon matrix of SnS_(2)@NSC CSN fiber gives fast ion/electron pathways and facilitates to decrease particle aggregation.Meanwhile,N,S codpants favor to trap the polysulfides intermediates and alleviate the sulfur loss during cycling.Moreover,the voids internal the beads further provide the high accommodation to volume change.Taken all above advantages,the SnS_(2)@NSC CSN fiber achieves the excellent high rate capability and ultrastable cycling property,which obtains a low capacity decay rate of 0.013%after 2000 cycles at 2 A g^(-1).Moreover,its good mechanical characteristics ensure the fabrication of the flexible PIB full cell,which achieves the high pliability,superior power/energy density and high reliability in diverse working conditions.Therefore,this work not only gives a new clue to design the highperformance electrode for potassium storage,but also propels the applications of PIBs for diverse electronics.

关 键 词：Core-shell structure Tin sulfide Heteroatom dopants Cycling stability Potassium-ion batteries 

分 类 号：TM912[电气工程—电力电子与电力传动]