Premium
Mesoporous TiO 2 ‐Sn/C Core‐Shell Nanowire Arrays as High‐Performance 3D Anodes for Li‐Ion Batteries
Author(s) -
Liao JinYun,
Manthiram Arumugam
Publication year - 2014
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.201400403
Subject(s) - materials science , anode , nanowire , mesoporous material , electrode , lithium (medication) , composite number , chemical engineering , ion , nanotechnology , foil method , composite material , catalysis , medicine , biochemistry , chemistry , physics , quantum mechanics , endocrinology , engineering
Three‐dimensional mesoporous TiO 2 ‐Sn/C core‐shell nanowire arrays are prepared on Ti foil as anodes for lithium‐ion batteries. Sn formed by a reduction of SnO 2 is encapsulated into TiO 2 nanowires and the carbon layer is coated onto it. For additive‐free, self‐supported anodes in Li‐ion batteries, this unique core‐shell composite structure can effectively buffer the volume change, suppress cracking, and improve the conductivity of the electrode during the discharge‐charge process, thus resulting in superior rate capability and excellent long‐term cycling stability. Specifically, the TiO 2 ‐Sn/C nanowire arrays display rechargeable discharge capacities of 769, 663, 365, 193, and 90 mA h g −1 at 0.1C, 0.5C, 2C 10C, and 30C, respectively (1C = 335 mA g −1 ). Furthermore, the TiO 2 ‐Sn/C nanowire arrays exhibit a capacity retention rate of 84.8% with a discharge capacity of over 160 mA h g −1 , even after 100 cycles at a high current rate of 10C.