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Ultrathin TiO 2 Coating on LiCoO 2 for Improved Electrochemical Performance as Li–Ion Battery Cathode
Author(s) -
Jayasree Silpasree S.,
Nair Shantikumar,
Santhanagopalan Dhamodaran
Publication year - 2018
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201703084
Subject(s) - x ray photoelectron spectroscopy , materials science , dielectric spectroscopy , electrochemistry , coating , cathode , chemical engineering , transmission electron microscopy , scanning electron microscope , analytical chemistry (journal) , nanotechnology , electrode , composite material , chemistry , engineering , chromatography
Surface modification of LiCoO 2 (LCO) gained much attention as it could play a prominent role in improving electrochemical performance and structural stability. Herein, we report an ultra‐thin TiO 2 coating on LiCoO 2 (LCO‐TiO 2 ) as a potential candidate to overcome the electrochemical, structural instability and interface issues of the bare‐LCO. The structural properties as well as electrochemical performances of bare‐LCO and LCO‐TiO 2 were investigated by X‐Ray diffraction, Transmission Electron Microscopy (TEM), X‐ray Photoelectron Spectroscopy (XPS), Galvanostatic charge‐discharge and electrochemical impedance spectroscopy (EIS). At the end of 100 cycles, 1C rate capacity retention was about 50% and 90% for bare‐LCO and LCO‐TiO 2 respectively. Rate studies showed that the bare LCO exhibited a specific capacity of ∼120 mAh/g and only 16 mAh/g at 1C and 60 discharge rates respectively whereas, the TiO 2 coated LCO showed a capacity of ∼132 mAh/g and nearly 98 mAh/g at 1C and 60C discharge rates respectively. The implementation of TiO 2 coating over LiCoO 2 enhanced the electrochemical performance, cell stability as well as efficiency.