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Effects of annealing temperature on electrochemical performance of SnSx embedded in hierarchical porous carbon with N-carbon coating by in-situ structural phase transformation as anodes for lithium ion batteries
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作者 Qianqian Hu Biao Wang +6 位作者 Shiyong Chang Chun Yang Yunjian Hu Shubin Cao Jiqun Lu Lingzhi Zhang Ye Hong 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2021年第25期191-199,共9页
Tuned tin chalcogenides rooted in hierarchical porous carbon(HPC)with N-carbon coating layers are prepared by thermal shock under various temperatures(denoted as HPC-SnS_(2)-PAN-Various T).With the increase of anneali... Tuned tin chalcogenides rooted in hierarchical porous carbon(HPC)with N-carbon coating layers are prepared by thermal shock under various temperatures(denoted as HPC-SnS_(2)-PAN-Various T).With the increase of annealing temperature,the morphology and phase structure of Sn S_(2),as well as the cyclization degree of polyacrylonitrile(PAN),are significantly changed,which leads to the formation of rod-like Sn S and ordered structure of conductive N-carbon layer.By combining HPC,N-carbon coating derived from the cyclization of PAN,with 1D Sn S nanorods generated from structural phase transformation of SnS_(2),the optimized composite(HPC-SnS_(2)-PAN-500)as anode for lithium ion batteries(LIBs)provides buffer space for volume changes during alloying/dealloying process,builds a highly conductive network as well as decreases irreversible capacity from solid electrolyte interphase and enhances the ion/electron transport.Attributed to the above merits from composition regulation and architecture modification by sulfur depletion and PAN cyclization,this target anode exhibits an extraordinary cycling stability with a high specific capacity of 652.5 m A h/g at 0.5 A/g after 900 cycles.It suggests that rod-like Sn S embedded in HPC with cyclized PAN layers by thermal treatment approach renders a potential structural design of anode materials for LIBs. 展开更多
关键词 Hierarchical porous carbon snsx Conducting medium Cycling stability Lithium ion batteries
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