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- Title
K-Doped Li-Rich Molybdenum-Based Oxide with Improved Electrochemical Properties for Lithium-Ion Batteries.
- Authors
Yu, Shishun; Peng, Can; Li, Zhaohui; Zhang, Lingjun; Xiao, Qizhen; Lei, Gangtie; Ding, Yanhuai
- 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.
- Subjects
MOLYBDENUM oxides; LITHIUM-ion batteries; ELECTROCHEMISTRY
- Publication
Arabian Journal for Science & Engineering (Springer Science & Business Media B.V. ), 2017, Vol 42, Issue 10, p4291
- ISSN
2193-567X
- Publication type
Article
- DOI
10.1007/s13369-017-2719-4