Zinc‐Reduced Mesoporous TiOx Li‐Ion Battery Anodes with Exceptional Rate Capability and Cycling Stability |
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| Authors: | Woo‐Jin Song Dr Seungmin Yoo Dr Jung‐In Lee Jung‐Gu Han Yeonguk Son Sun‐I Kim Myoungsoo Shin Dr Sinho Choi Prof Ji‐Hyun Jang Prof Jaephil Cho Prof Nam‐Soon Choi Prof Soojin Park |
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| Institution: | 1. Department of Energy Engineering, School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan, Republic of Korea;2. Department of Environmental and Chemical Industry, Ulsan College, Ulsan, Republic of Korea |
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| Abstract: | 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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| Keywords: | lithium-ion batteries mesoporous TiOx redox– transmetalation process zinc reduction |
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