Issue 7, 2024

Co1−xS@CNT composite with a three-dimensional skeleton for high-performance magnesium–lithium hybrid batteries

Abstract

Magnesium–lithium hybrid batteries (MLHB) combine the advantages of magnesium and lithium ions for recharging, thus becoming a very attractive energy storage system. Transitional metal sulfides (TMSs) have attracted attention owing to their large theoretical capacity. However, these materials are accompanied by a huge volume change during charging and discharging processes. This leads to a serious decline in the capacity of their electrode material. In this study, we used low-cost materials to prepare a Co1−xS@CNT composite material and used it as the positive electrode for Mg2+/Li+ hybrid batteries. X-ray diffraction, scanning electron microscopy, and transmitting electron microscopy analyses were employed for the structural and morphological characterisation of the prepared Co1−xS@CNT. Cyclic voltammetry, electrochemical impedance spectroscopy, and X-ray photoelectronic spectroscopy methods were used to determine the mechanism and material reversibility of magnesium ions inserted into the substrate material. The Co1−xS@CNT was assembled as a positive material in a magnesium–lithium hybrid battery and it showed good circulation stability (a capacity retention of 68% after 200 cycles at a current density of 200 mA g−1). This study provides a new idea for the design and synthesis of metal sulfide nanocomposites.

Graphical abstract: Co1−xS@CNT composite with a three-dimensional skeleton for high-performance magnesium–lithium hybrid batteries

Supplementary files

Article information

Article type
Paper
Submitted
07 Dec 2023
Accepted
31 Jan 2024
First published
01 Feb 2024
This article is Open Access
Creative Commons BY-NC license

Mater. Adv., 2024,5, 2818-2825

Co1−xS@CNT composite with a three-dimensional skeleton for high-performance magnesium–lithium hybrid batteries

C. Shan, W. Wei, X. Ling, X. Qin, Z. Liu, M. Song and L. Mi, Mater. Adv., 2024, 5, 2818 DOI: 10.1039/D3MA01089A

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