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Zinc‐Reduced Mesoporous TiO x Li‐Ion Battery Anodes with Exceptional Rate Capability and Cycling Stability
Author(s) -
Song WooJin,
Yoo Seungmin,
Lee JungIn,
Han JungGu,
Son Yeonguk,
Kim SunI,
Shin Myoungsoo,
Choi Sinho,
Jang JiHyun,
Cho Jaephil,
Choi NamSoon,
Park Soojin
Publication year - 2016
Publication title -
chemistry – an asian journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.18
H-Index - 106
eISSN - 1861-471X
pISSN - 1861-4728
DOI - 10.1002/asia.201601061
Subject(s) - anode , dielectric spectroscopy , materials science , mesoporous material , cathode , battery (electricity) , electrochemistry , oxygen , redox , chemical engineering , conductivity , analytical chemistry (journal) , electrode , inorganic chemistry , chemistry , metallurgy , catalysis , chromatography , biochemistry , power (physics) , physics , organic chemistry , quantum mechanics , engineering
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.