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

Publication Type:
Journal Article
Citation:
Chemistry - An Asian Journal, 2016, 11 (23), pp. 3382 - 3388
Issue Date:
2016-12-06
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© 2016 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim We demonstrate a unique synthetic route for oxygen-deficient mesoporous TiO x 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 TiO 2 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 TiO x . The resulting oxygen-deficient TiO x 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 LiCoO 2 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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