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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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Abstract

Layered Li[Li0.16Ni0.21Mn0.63]O2 and Li[Li0.2Ni0.2Mn0.6]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 Li[Li0.16Ni0.21Mn0.63]O2 leads to a higher capacity owing to faster Li+ chemical diffusivity relative to the baseline composition Li[Li0.2Ni0.2Mn0.6]O2. Cyclic voltammograms (CV) and a simultaneous direct current (DC) resistance measurement were also performed on Li/Li[Li0.16Ni0.21Mn0.63]O2 and Li/Li[Li0.2Ni0.2Mn0.6]O2 cells. Li[Li0.16Ni0.21Mn0.63]O2 shows better electrochemical performance with a reversible capacity of 158 mA hg−1 at 1C rate at 20 °C.

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Acknowledgements

This study was supported by National Science Foundation of China (grant No. 50372064 and 20471057). We are also grateful to the China Education Ministry (SRFDP No. 20030358057). The USTC radiation chemistry laboratory has provided the assistance for the polymer gel synthesis. Hefei National Synchrotron Radiation Laboratory has assisted in collecting the XANES data.

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Authors and Affiliations

  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

    H. Y. Xu, Q. Y. Wang & C. H. Chen

  2. Department of Inorganic Non-metal Material Engineering, Shandong University of Science and Technology, Shandong Qingdao, 266510, People’s Republic of China

    H. Y. Xu

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  1. H. Y. Xu
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  2. Q. Y. Wang
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  3. C. H. Chen
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Correspondence to C. H. Chen.

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Xu, H.Y., Wang, Q.Y. & Chen, C.H. Synthesis of Li[Li0.2Ni0.2Mn0.6]O2 by radiated polymer gel method and impact of deficient Li on its structure and electrochemical properties. J Solid State Electrochem 12, 1173–1178 (2008). https://doi.org/10.1007/s10008-008-0546-y

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  • DOI: https://doi.org/10.1007/s10008-008-0546-y

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