A flexible copper sulfide @ multi-walled carbon nanotubes cathode for advanced magnesium-lithium-ion batteries.

Author(s) Zhang, Y.; Li, Y.; Wang, Y.; Guo, R.; Liu, W.; Pei, H.; Yin, G.; Ye, D.; Yu, S.; Xie, J.
Journal J Colloid Interface Sci
Date Published 2019 Oct 01

The hybrid magnesium-lithium-ion batteries (MLIBs) are promising alternatives in large-scale energy storage field owing to low cost and high safety of magnesium batteries and fast diffusion rate of Li-ion in the electrode. Herein, a free-standing and binder-free copper sulfide/Multi-walled carbon nanotubes film cathode (F-CuS-CNT), along with Mg-Li dual-salt electrolyte and dendrite-free Mg anode, is employed to construct the MLIBs. At room temperature (25 °C), the F-CuS-CNT electrode with a CuS content up to 70% exhibits a high initial specific capacity of 479 mAh g (∼85.5% of the theoretical capacity) and a considerable cycling stability (165 mAh g even after 100 cycles at the current density of 30 mA g), which far surpasses those of conventional CuS electrode. The excellent electrochemical performances of the F-CuS-CNTs electrode can be attributed to its excellent flexible network architecture as well as abundant pores, which provide more stable conductive buffering layers for CuS particles and higher Li diffusion dynamics during the charging/discharging process. This work demonstrates that constructing a flexible and free-standing film electrode could improve the electrochemical performances of MLIBs and may be an appropriate select of preparing flexible MLIBs.

DOI 10.1016/j.jcis.2019.06.027
ISSN 1095-7103
Citation J Colloid Interface Sci. 2019;553:239246.

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