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K-Doped Li-Rich Molybdenum-Based Oxide with Improved Electrochemical Properties for Lithium-Ion Batteries

  • Research Article - Special Issue - Functional Materials - Chemistry
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Abstract

Li-rich molybdenum-based oxide (\(\hbox {Li}_{2}\hbox {MoO}_{3})\), which owns a layered structure similar to that of \(\hbox {Li}_{2}\hbox {MnO}_{3}\), has caused much attention as a kind of high-energy-density cathode material for Li-ion batteries. Although \(\hbox {Mo}^{4+}\) in the [\(\hbox {Li}\hbox {Mo}_{2}\)] slabs could be oxidized to \(\hbox {Mo}^{5+}/\hbox {Mo}^{6+ }\) easily, the \(\hbox {Li}_{2}\hbox {MoO}_{3 }\) might still suffer from a phase transformation from layered to disordered at a deeply charged state more than 4.4 V (vs. \(\hbox {Li}^{+}/\hbox {Li}\)) in the first cycle, resulting in fast capacity degradation. To resolve these issues, \(\hbox {K}^{+}\) ion is chosen to dope into the \(\hbox {Li}_{2}\hbox {MoO}_{3}\) crystal using a K-doped precursor \(\hbox {K}_{0.1}\hbox {MoO}_{3}\) that prepared by a hydrothermal method. The as-prepared \(\hbox {Li}_{1.9}\hbox {K}_{0.1}\hbox {MoO}_{3}\) sample showed nanobelt morphology and possessed a layered structure. Befitting from the chemical pre-insertion of \(\hbox {K}^{+}\), this doped sample exhibited a stable cycling life and an improved rate capability when operated over the potential range of 1.5–4.4 V (vs. \(\hbox {Li}^{+}/\hbox {Li}\)). The results suggest that chemical pre-insertion of \(\hbox {K}^{+}\) is an effective approach to improve the electrochemical properties of the \(\hbox {Li}_{2}\hbox {MoO}_{3 }\) cathode material.

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Acknowledgements

The authors greatly appreciate the financial support from the Scientific Research Foundation of Hunan Provincial Education Department (No. 17A205), National Natural Science Foundation of China (No. 21376069, 21576075) and Hunan Natural Science Foundation (2015JJ3115). Mr. Jicheng Li is also appreciated for his refinement of the lattice parameters using the GSAS program.

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Authors and Affiliations

  1. Key Laboratory of Environmentally Friendly Chemistry and Applications of Ministry of Education, College of Chemistry, Xiangtan University, Xiangtan, 411105, Hunan, People’s Republic of China

    Shishun Yu, Can Peng, Zhaohui Li, Lingjun Zhang, Qizhen Xiao & Gangtie Lei

  2. College of Civil Engineering and Mechanics, Institute of Rheology Mechanics, Xiangtan University, Xiangtan, 411105, Hunan, People’s Republic of China

    Yanhuai Ding

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  1. Shishun Yu
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  2. Can Peng
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Correspondence to Zhaohui Li.

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Yu, S., Peng, C., Li, Z. et al. K-Doped Li-Rich Molybdenum-Based Oxide with Improved Electrochemical Properties for Lithium-Ion Batteries. Arab J Sci Eng 42, 4291–4298 (2017). https://doi.org/10.1007/s13369-017-2719-4

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  • DOI: https://doi.org/10.1007/s13369-017-2719-4

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