Zinc-Reduced Mesoporous TiO Li-Ion Battery Anodes with Exceptional Rate Capability and Cycling Stability.
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Chemistry, an Asian journal, ISSN: 1861-471X, Vol: 11, Issue: 23, Page: 3382-3388
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We demonstrate a unique synthetic route for oxygen-deficient mesoporous TiO 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 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 . The resulting oxygen-deficient TiO battery anode exhibits a high reversible capacity (∼180 mA h g at a discharge/charge rate of 1 C/1 C after 400 cycles) and an excellent rate capability (∼90 mA h g even at a rate of 10 C). Also, the full cell, which is coupled with a LiCoO cathode material, exhibits an outstanding rate capability (>75 mA h g at a rate of 3.0 C) and maintains a reversible capacity of over 100 mA h g at a discharge/charge of 1 C/1 C for 300 cycles.