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Long-range disordered MoO2 with rich oxygen vacancies for high-rate and durable lithium storage by Rongrong Liu; Jizheng Feng; Ranxiao Tang; Tao Meng is a Engineering article available to read on EtoBox.

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Transition metal oxides (TMOs) with high theoretical capacity hold great promise to replace the current graphite for lithium-ion battery, but they are limited by unsatisfactory high-rate and cycling stability. Herein, we demonstrated the mechanisms of oxygen vacancies and long-range disordered structure of MoO2-δ for high-rate and durable lithium storage, which aims at solving the trade-off between the capacity and high-rate and/or cycling stability on universal TMOs anodes. Series of experiments and density functional theory results demonstrate that oxygen vacancies in MoO2-δ could increase its electronic conductivity and optimize the Li-ion migration pathway as well as energy barrier for improving the Li-ion migration dynamics and high-rate performance, meanwhile the robust cycling stability of MoO2-δ anode is benefitted from the isotropic character of its long-range disordered structure and the corresponding derived ability to buffer the volume changes. As expected, the target MoO2-δ shows the high discharge capacity (1631.3 mA h g−1 at 0.2 A g−1), excellent rate capability (average capacities of 592.6 mAh g−1 at 8.0 A g−1), and robust cycling stability (1000 cycles without obvi

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Author

Rongrong Liu; Jizheng Feng; Ranxiao Tang; Tao Meng

Publisher

Elsevier BV

Published

2023

Language

EN

Field

Engineering (Physical Sciences)