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Title: Single-crystalline TiO2(B) nanobelts with unusual large exposed {100} facets and enhanced Li-storage capacity
Authors: Wang, Q.
Shen, Lei
Xue, Tong
Cheng, Gao
Huang, C. Z.
Fan, Hong Jin
Feng, Y. P.
Keywords: Science::Chemistry
Issue Date: 2021
Source: Wang, Q., Shen, L., Xue, T., Cheng, G., Huang, C. Z., Fan, H. J. & Feng, Y. P. (2021). Single-crystalline TiO2(B) nanobelts with unusual large exposed {100} facets and enhanced Li-storage capacity. Advanced Functional Materials, 31(2), 2002187-.
Journal: Advanced Functional Materials
Abstract: 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 H2Ti3O7 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 LiTiO2 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.
ISSN: 1616-301X
DOI: 10.1002/adfm.202002187
Rights: © 2020 The Authors. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
Appears in Collections:SPMS Journal Articles

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