Issue 25, 2013
From the journal:

Journal of Materials Chemistry A

Carbon coated TiO2–SiO2 nanocomposites with high grain boundary density as anode materials for lithium-ion batteries

Jing-Jing Zhang,a   Zhen Wei,a   Tao Huang,a   Zhao-Lin Liu*b  and  Ai-Shui Yu*a  

* Corresponding authors

a Department of Chemistry, Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Institute of New Energy, Fudan University, Shanghai 200438, China
E-mail: asyu@fudan.edu.cn
Fax: +86-21-51630320
Tel: +86-21-51630320

b Institute of Materials Research and Engineering, Agency for Science, Technology and Research (A*STAR), 3 Research Link, Singapore 117602, Singapore
E-mail: zl-liu@imre.a-star.edu.sg

Abstract

Carbon coated TiO2–SiO2 nanocomposites (CTSO) with high grain boundary density fabricated by a simple hydrothermal approach have been investigated as anode materials for lithium-ion batteries. The CTSO anode exhibits superior high-rate capability and excellent cycling performance. The specific capacity of CTSO is much higher than that of pure TiO2 and silica-modified TiO2 without carbon nanocoating (TSO), indicating a positive synergistic effect of the material and structural hybridization on the enhancement of the electrochemical properties. The possible contributing factors include the formation of the Ti–O–Si bonding, which facilitates the reaction between SiO2 and Li; the presence of carbon layering on each nanocrystal; high grain boundary density among the nanoparticles and grain boundary interface areas embedded in a carbon matrix, where electronic and ionic transport properties are tuned by interfacial design and by varying the spacing of interfaces down to the nanoscale regime. The grain boundary interface embedded in the carbon matrix can also store electrolyte and allows more channels for the insertion/extraction reaction of Li ions. The composites exhibit strong potential as a promising anode for lithium-ion batteries.

Graphical abstract: Carbon coated TiO2–SiO2 nanocomposites with high grain boundary density as anode materials for lithium-ion batteries

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Article information

DOI
https://doi.org/10.1039/C3TA11137G
Article type
Paper
Submitted
20 Mar 2013
Accepted
11 Apr 2013
First published
11 Apr 2013

J. Mater. Chem. A, 2013,1, 7360-7369

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Carbon coated TiO2–SiO2 nanocomposites with high grain boundary density as anode materials for lithium-ion batteries

J. Zhang, Z. Wei, T. Huang, Z. Liu and A. Yu, J. Mater. Chem. A, 2013, 1, 7360 DOI: 10.1039/C3TA11137G

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