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Synthesis of Li[Li0.2Ni0.2Mn0.6]O2 by radiated polymer gel method and impact of deficient Li on its structure and electrochemical properties |
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| Authors: | H Y Xu Q Y Wang C H Chen |
| Institution: | (1) Laboratory for Advanced Functional Materials and Devices, Department of Materials Science and Engineering, University of Science and Technology of China, Anhui Hefei, 230026, People’s Republic of China;(2) Department of Inorganic Non-metal Material Engineering, Shandong University of Science and Technology, Shandong Qingdao, 266510, People’s Republic of China |
| Abstract: | Layered LiLi0.16Ni0.21Mn0.63]O2 and LiLi0.2Ni0.2Mn0.6]O2 compounds were successfully synthesized by radiated polymer gel (RPG) method. The effect of deficient Li on the structure and electrochemical performance was investigated by means of X-ray diffraction, X-ray absorption near-edge spectroscopy and electrochemical cell cycling. The reduced Ni valence in LiLi0.16Ni0.21Mn0.63]O2 leads to a higher capacity owing to faster Li+ chemical diffusivity relative to the baseline composition LiLi0.2Ni0.2Mn0.6]O2. Cyclic voltammograms (CV) and a simultaneous direct current (DC) resistance measurement were also performed on Li/LiLi0.16Ni0.21Mn0.63]O2 and Li/LiLi0.2Ni0.2Mn0.6]O2 cells. LiLi0.16Ni0.21Mn0.63]O2 shows better electrochemical performance with a reversible capacity of 158 mA hg−1 at 1C rate at 20 °C. |
| Keywords: | Lithium nickel manganese oxide Lithium deficiency Cathode Lithium battery |
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