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Issue 22, 2013
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SBA-15 confined synthesis of TiNb2O7 nanoparticles for lithium-ion batteries

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Abstract

Unlike most conventional anode materials, the newly developed TiNb2O7 (TNO) does not form a solid electrolyte interface (SEI) layer, which makes it safe for high power requiring lithium-ion batteries. In this paper, we demonstrated an SBA-15 confined synthetic approach to prepare TNO nanoparticles (S-TNO) with a small particle size around 10 nm and a large BET surface area of 79.5 m2 g−1. It is worth mentioning that this is the smallest size reported so far for TNO. In contrast, the TNO (L-TNO) synthesized without SBA-15 has a particle size above 100 nm and a BET surface area of only 4.3 m2 g−1. The S-TNO shows better lithium-ion storage properties than L-TNO. The excellent electrochemical performance of S-TNO is attributed to its small crystalline size, which not only provides a larger effective area for better contact between the electrode material and the electrolyte, but also reduces the rate-limiting Li diffusion path. Moreover, S-TNO shows a high Coulombic efficiency (above 98% over 300 cycles) and negligible increase of impedance after cycling, which confirms no SEI layer formation in the operational voltage (1–3 V) of TNO.

Graphical abstract: SBA-15 confined synthesis of TiNb2O7 nanoparticles for lithium-ion batteries

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Article information


Submitted
12 Jul 2013
Accepted
04 Sep 2013
First published
06 Sep 2013

Nanoscale, 2013,5, 11102-11107
Article type
Paper

SBA-15 confined synthesis of TiNb2O7 nanoparticles for lithium-ion batteries

L. Fei, Y. Xu, X. Wu, Y. Li, P. Xie, S. Deng, S. Smirnov and H. Luo, Nanoscale, 2013, 5, 11102
DOI: 10.1039/C3NR03594H

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