Azobenzene mesogens mediated preparation of Sn S nanocrystals encapsulated with in-situ N-doped carbon and their enhanced electrochemical performance for lithium ion batteries application  

作　　者：王勐 周旸 段军飞 谌东中 

机构地区：[1]Department of Polymer Science and Engineering,Key Laboratory of High Performance Polymer Materials and Technology of Ministry of Education,School of Chemistry and Chemical Engineering,Nanjing University [2]Department of Physics and Electronic Science,Changsha University of Science and Technology

出　　处：《Chinese Physics B》2016年第9期131-135,共5页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China(Grant No.21574062);the Huaian High-Technology Research Institute of Nanjing University,China(Grant No.2011Q1)

摘　　要：In this work,azobenzene mesogen-containing tin thiolates have been synthesized,which possess ordered lamellar structures persistent to higher temperature and serve as liquid crystalline precursors.Based on the preorganized tin thiolate precursors,Sn S nanocrystals encapsulated with in-situ N-doped carbon layer have been achieved through a simple solventless pyrolysis process with the azobenzene mesogenic thiolate precursor served as Sn,S,N,and C sources simultaneously.Thus prepared nanocomposite materials as anode of lithium ion batteries present a large specific capacity of 604.6 m Ah·g^（-1）at a current density of 100 m A·g^（-1）,keeping a high capacity retention up to 96% after 80 cycles,and display high rate capability due to the synergistic effect of well-dispersed Sn S nanocrystals and N-doped carbon layer.Such encouraging results shed a light on the controlled preparation of advanced nanocomposites based on liquid crystalline metallomesogen precursors and may boost their novel intriguing applications.In this work,azobenzene mesogen-containing tin thiolates have been synthesized,which possess ordered lamellar structures persistent to higher temperature and serve as liquid crystalline precursors.Based on the preorganized tin thiolate precursors,Sn S nanocrystals encapsulated with in-situ N-doped carbon layer have been achieved through a simple solventless pyrolysis process with the azobenzene mesogenic thiolate precursor served as Sn,S,N,and C sources simultaneously.Thus prepared nanocomposite materials as anode of lithium ion batteries present a large specific capacity of 604.6 m Ah·g^（-1）at a current density of 100 m A·g^（-1）,keeping a high capacity retention up to 96% after 80 cycles,and display high rate capability due to the synergistic effect of well-dispersed Sn S nanocrystals and N-doped carbon layer.Such encouraging results shed a light on the controlled preparation of advanced nanocomposites based on liquid crystalline metallomesogen precursors and may boost their novel intriguing applications.

关 键 词：azobenzene-containing tin thiolates liquid crystalline precursor controlled synthesis in-situ Ndoped 

分 类 号：O753.2[理学—晶体学] TM912[电气工程—电力电子与电力传动]