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Synthesis and electrochemical properties of Ca-doped LiNi0.8Co0.2O2 cathode material for lithium ion battery

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Abstract

LiNi0.8Co0.2O2 and Ca-doped LiNi0.8Co0.2O2 cathode materials have been synthesized via a rheological phase reaction method. X-ray diffraction studies show that the Ca-doped material, and also the discharged electrode, maintains a hexagonal structure even when cycled in the range of 3.0–4.35 V (vs Li+/Li) after 100 cycles. Electrochemical tests show that Ca doping significantly improves the reversible capacity and cyclability. The improvement is attributed to the formation of defects caused by the partial occupancy of Ca2+ ions in lithium lattice sites, which reduce the resistance and thus improve the electrochemical properties.

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Acknowledgement

This work was supported by the National Natural Science Foundation of China (No. 20471044).

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Authors and Affiliations

  1. Department of Chemistry, Wuhan University, Wuhan, 430072, People’s Republic of China

    Chiwei Wang, Xiaoling Ma, Jinguo Cheng, Jutang Sun & Yunhong Zhou

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  1. Chiwei Wang
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  2. Xiaoling Ma
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  3. Jinguo Cheng
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  4. Jutang Sun
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  5. Yunhong Zhou
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Correspondence to Jutang Sun.

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Wang, C., Ma, X., Cheng, J. et al. Synthesis and electrochemical properties of Ca-doped LiNi0.8Co0.2O2 cathode material for lithium ion battery. J Solid State Electrochem 11, 361–364 (2007). https://doi.org/10.1007/s10008-006-0150-y

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  • DOI: https://doi.org/10.1007/s10008-006-0150-y

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