Zinc-Reduced Mesoporous TiO<inf>x</inf> Li-Ion Battery Anodes with Exceptional Rate Capability and Cycling Stability

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Journal Article
Chemistry - An Asian Journal, 2016, 11 (23), pp. 3382 - 3388
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© 2016 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim We demonstrate a unique synthetic route for oxygen-deficient mesoporous TiOx by a redox–transmetalation process by using Zn metal as the reducing agent. The as-obtained materials have significantly enhanced electronic conductivity; 20 times higher than that of as-synthesized TiO2 material. Moreover, electrochemical impedance spectroscopy (EIS) and galvanostatic intermittent titration technique (GITT) measurements are performed to validate the low charge carrier resistance of the oxygen-deficient TiOx. The resulting oxygen-deficient TiOx battery anode exhibits a high reversible capacity (∼180 mA h g−1 at a discharge/charge rate of 1 C/1 C after 400 cycles) and an excellent rate capability (∼90 mA h g−1 even at a rate of 10 C). Also, the full cell, which is coupled with a LiCoO2 cathode material, exhibits an outstanding rate capability (>75 mA h g−1 at a rate of 3.0 C) and maintains a reversible capacity of over 100 mA h g−1 at a discharge/charge of 1 C/1 C for 300 cycles.
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