High reversible pseudocapacity in mesoporous yolk-shell anatase TiO2/TiO2(B) microspheres used as anodes for li-ion batteries

Wei, H, Rodriguez, E, Hollenkamp, A, Bhatt, A, Chen, D and Caruso, R 2017, 'High reversible pseudocapacity in mesoporous yolk-shell anatase TiO2/TiO2(B) microspheres used as anodes for li-ion batteries', Advanced Functional Materials, vol. 27, no. 46, 1703270, pp. 1-9.


Document type: Journal Article
Collection: Journal Articles

Title High reversible pseudocapacity in mesoporous yolk-shell anatase TiO2/TiO2(B) microspheres used as anodes for li-ion batteries
Author(s) Wei, H
Rodriguez, E
Hollenkamp, A
Bhatt, A
Chen, D
Caruso, R
Year 2017
Journal name Advanced Functional Materials
Volume number 27
Issue number 46
Article Number 1703270
Start page 1
End page 9
Total pages 8
Publisher Wiley
Abstract As an anode material for lithium-ion batteries, titanium dioxide (TiO 2 ) shows good gravimetric performance (336 mAh g -1 for LiTiO 2 ) and excellent cyclability. To address the poor rate behavior, slow lithium-ion (Li + ) diffusion, and high irreversible capacity decay, TiO 2 nanomaterials with tuned phase compositions and morphologies are being investigated. Here, a promising material is prepared that comprises a mesoporous "yolk-shell" spherical morphology in which the core is anatase TiO 2 and the shell is TiO 2 (B). The preparation employs a NaCl-assisted solvothermal process and the electrochemical results indicate that the mesoporous yolk-shell microspheres have high specific reversible capacity at moderate current (330.0 mAh g -1 at C/5), excellent rate performance (181.8 mAh g -1 at 40C), and impressive cyclability (98% capacity retention after 500 cycles). The superior properties are attributed to the TiO 2 (B) nanosheet shell, which provides additional active area to stabilize the pseudocapacity. In addition, the open mesoporous morphology improves diffusion of electrolyte throughout the electrode, thereby contributing directly to greatly improved rate capacity.
Subject Physical Sciences not elsewhere classified
Keyword(s) lithium-ion batteries
mesoporous materials
pseudocapacity
TiO (B) 2
yolk-shell microspheres
DOI - identifier 10.1002/adfm.201703270
Copyright notice © 2017 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
ISSN 1616-301X
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