4.8 Article

Single-Crystalline TiO2(B) Nanobelts with Unusual Large Exposed {100} Facets and Enhanced Li-Storage Capacity

Journal

ADVANCED FUNCTIONAL MATERIALS
Volume 31, Issue 2, Pages -

Publisher

WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.202002187

Keywords

crystal facets; first principles; lithium-ion batteries; lithium-ion diffusion; TiO2(B)

Funding

  1. National Natural Science Foundation of China [21535006]
  2. China Postdoctoral Science Foundation [2017M612886]
  3. Fundamental Research Funds for the Central Universities [XDJK2019AA002, XDJK2017B043]
  4. Sino (Chongqing)-Singapore Joint Postdoctoral Promotion Program
  5. Sino-Singapore International Joint Research Institute (JRI) [204-A018002]

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By synthesizing single-crystalline TiO2(B) nanobelts with exposed {100} facets, this study successfully enhances Li-storage capacity, providing a practical strategy to increase Li-ion capacity and cycle stability.
The {100} facet of single-crystalline TiO2(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 TiO2(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 anabin-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.

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