ChemElectroChem
ChemElectroChem
4 years ago

Freestanding Nanoengineered [001] Preferentially Oriented TiO2 Nanosheets−Graphene Planarly Aligned Nanohybrids with Enhanced Li-Storage Properties

Freestanding Nanoengineered [001] Preferentially Oriented TiO2 Nanosheets−Graphene Planarly Aligned Nanohybrids with Enhanced Li-Storage Properties
Biao Gao, Yuanyuan Li, Zhenhua Liao, Xiang Peng, Paul K Chu, Kaifu Huo, Qingwei Li, Lei Wang, Jiabao Zhang, Xiaochuan Ren
A freestanding film electrode comprising face-to-face alternately stacked 2D TiO2 nanosheets and reduced graphene oxide (rGO) is designed and fabricated as a binder-free anode for lithium-ion batteries. The ultrathin TiO2 nanosheets, with (001) facets exposed were face-to-face hetero-assembled onto the conductive rGO, allowing Li+ to swiftly diffuse into the TiO2 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.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/celc.201700551

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