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Single‐Crystalline TiO 2 (B) Nanobelts with Unusual Large Exposed {100} Facets and Enhanced Li‐Storage Capacity
Author(s) -
Wang Qiang,
Shen Lei,
Xue Tong,
Cheng Gao,
Huang Cheng Zhi,
Fan Hong Jin,
Feng Yuan Ping
Publication year - 2021
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.202002187
Subject(s) - materials science , ion , facet (psychology) , electrochemistry , chemical engineering , diffusion , coating , nanostructure , nanotechnology , crystal (programming language) , single crystal , crystallography , chemistry , electrode , thermodynamics , organic chemistry , computer science , engineering , psychology , social psychology , physics , personality , big five personality traits , programming language
The {100} facet of single‐crystalline TiO 2 (B) is an ideal platform for inserting Li ions, but it is hard to be obtained due to its high surface energy. Here, the single‐crystalline TiO 2 (B) nanobelts from H 2 Ti 3 O 7 with nearly 70% {100} facets exposed are synthesized, which significantly enhances Li‐storage capacity. The first‐principle calculations demonstrate an ab in‐plane 2D diffusion through the exposed {100} facets. As a consequence, the nanobelts can significantly accommodate Li ions in LiTiO 2 formula with specific capacity up to 335 mAh g −1 , which is in good agreement with the electrochemical characterizations. Coating with conductive and protective poly(3,4‐ethylenedioxythiophene)‐poly(styrenesulfonate), the cut‐off discharge voltage is as low as 0.5 V, leading to a capacity of 160.7 mAh g −1 after 1500 cycles with a retention rate of 66% at 1C. This work provides a practical strategy to increase the Li‐ion capacity and cycle stability by tailoring the crystal orientation and nanostructures.