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Freestanding Nanoengineered [001] Preferentially Oriented TiO 2 Nanosheets−Graphene Planarly Aligned Nanohybrids with Enhanced Li‐Storage Properties
Author(s) -
Li Qingwei,
Li Yuanyuan,
Wang Lei,
Ren Xiaochuan,
Zhang Jiabao,
Liao Zhenhua,
Peng Xiang,
Gao Biao,
Chu Paul K,
Huo Kaifu
Publication year - 2017
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.201700551
Subject(s) - materials science , graphene , anode , electrode , lithium (medication) , nanotechnology , electrochemistry , energy storage , oxide , chemical engineering , optoelectronics , power (physics) , engineering , medicine , chemistry , physics , quantum mechanics , endocrinology , metallurgy
A freestanding film electrode comprising face‐to‐face alternately stacked 2D TiO 2 nanosheets and reduced graphene oxide (rGO) is designed and fabricated as a binder‐free anode for lithium‐ion batteries. The ultrathin TiO 2 nanosheets, with (001) facets exposed were face‐to‐face hetero‐assembled onto the conductive rGO, allowing Li + to swiftly diffuse into the TiO 2 nanosheets across the (001) facets with the lowest barrier and a short transfer distance. The configuration of this planar‐aligned electrode leads to superior lithium performance, which delivers a large capacity of 132.3 mA h g −1 with a capacity retention of 89 % over 1000 cycles at a high rate of 20 C (1 C=168 mA g −1 ). This work proves that controlling the arrangement orientation of electrode materials with an anisotropy Li + diffusion barrier could remarkably improve the electrochemical properties, for promising applications in high‐power energy‐storage devices.