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Bio-derived yellow TiO2: Lithiation induced activation of oxygen-vacancy dominated TiO2 lattice evoking a large boost in lithium storage performance

Abstract

Oxygen deficient TiO2 absorbs intensive attentions owning to its narrow bandgap and high electrical conductivity. In this work, a novel yellow TiO2 with the hierarchically porous architecture is fabricated by a facile pyrolysis in air via one biomass template. The obtained yellow TiO2 exhibits an interesting lithiation induced activation during cycles, which gives rise to the phase change from poor-crystallized TiO2 to amorphous phase as accompanying with a colour change from yellow to black. Differing to the intercalation mechanism reported in most literature on TiO2 anode of LIBs, notably, the reversible redox reaction between Ti3+ and metal Ti can be verified in this case, demonstrating a novel conversion reaction mechanism of TiO2 electrode. Based on it, the yellow porous TiO2 deliverers an enhanced electrochemical performance as anode of LIBs with the superior capacity of 480 mAh g-1 at 5 A g-1 and the high capacity of 206 mAh g-1 at 10 A g-1 after 8000 cycles.

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Publication details

The article was received on 23 Oct 2019, accepted on 26 Nov 2019 and first published on 27 Nov 2019


Article type: Paper
DOI: 10.1039/C9NR09042H
Nanoscale, 2019, Accepted Manuscript

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    Bio-derived yellow TiO2: Lithiation induced activation of oxygen-vacancy dominated TiO2 lattice evoking a large boost in lithium storage performance

    L. Sun, W. Liu, R. Wu, Y. Cui, Y. Zhang, Y. Du, S. Liu, S. Liu and H. Wang, Nanoscale, 2019, Accepted Manuscript , DOI: 10.1039/C9NR09042H

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