Surface modification of LiCoO₂ (LCO) gained much attention as it could play a prominent role in improving electrochemical performance and structural stability. Herein, we report an ultra‐thin TiO₂ coating on LiCoO₂ (LCO‐TiO₂) 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‐TiO₂ 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‐TiO₂ 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 TiO₂ coated LCO showed a capacity of ∼132 mAh/g and nearly 98 mAh/g at 1C and 60C discharge rates respectively. The implementation of TiO₂ coating over LiCoO₂ enhanced the electrochemical performance, cell stability as well as efficiency.

中文翻译：

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LiCoO2上的超薄TiO2涂层可改善锂离子电池正极的电化学性能

LiCoO ₂（LCO）的表面改性因其在改善电化学性能和结构稳定性方面起着重要作用而备受关注。本文中，我们报告了在LiCoO ₂（LCO-TiO ₂）上的超薄TiO ₂涂层，它有望克服裸LCO的电化学，结构不稳定性和界面问题。裸LCO和LCO-TiO ₂的结构性质及电化学性能通过X射线衍射，透射电子显微镜（TEM），X射线光电子能谱（XPS），恒电流充放电和电化学阻抗谱（EIS）进行了研究。在100个循环结束时，裸LCO和LCO-TiO _2的1C速率容量保持率分别约为50％和90％。速率研究表明，裸露的LCO在1C和60放电速率下的比容量分别约为120 mAh / g和16 mAh / g，而TiO ₂包覆的LCO的比容量约为132 mAh / g和近98 mAh / g分别在1C和60C放电速率下。在LiCoO _2上实施TiO ₂涂层可增强电化学性能，电池稳定性和效率。