期刊
JOURNAL OF COLLOID AND INTERFACE SCIENCE
卷 561, 期 -, 页码 818-828出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2019.11.064
关键词
Tin oxide; Reduced graphene oxide; Electrostatic - interaction - induced - self - assembly; Electrochemical properties; Mg-lon batteries; Energy storage
资金
- National Natural Science Foundation of China [51601073]
- Jiangsu Distinguished Professor Project [1064901601]
- Jiangsu Provincial Six Talent Peaks Project [1062991801]
- Jiangsu University of Science and Technology Research Start-Up Fund [1062921905]
Among post-lithium ion technologies, magnesium-ion batteries (MlBs) are receiving great concern in recent years. However, MIBs are mainly restrained by the lack of cathode materials, which may accommodate the fast diffusion kinetics of Mg2+ ions. To overcome this problem, herein we attempt to synthesize a reduced graphene oxide (rGO) encapsulated tin oxide (SnO2) nanoparticles composites through an electrostatic-inter action-induced-self-assembly approach at low temperature, The surface modification of SnO2 via carbonaceous coating enhanced the electrical conductivity of final composites. The SnO2-rGO composites with different weight ratios of rGO and SnO2 are employed as cathode material in magnesium-ion batteries. Experimental results show that MIB exhibits a maximum specific capacity of 222 mAhg(-1) at the current density of 20 mAg(-1) with a good cycle life (capacity retention of 90%). Unlike Li-ion batteries, no SnO2 nanoparticles expansion is observed during electrochemical cycling in all-phenyl-complex (APC) magnesium electrolytes, which ultimately improves the capacity retention. Furthermore, ex-situ x-ray diffraction and scanning electron microscopy (SEM) studies are used to understand the magnesiation/de-magnesiation mechanisms. At the end, SnO2-rGO composites are tested for Mg2+/Li+ hybrid ion batteries and results reveal a specific capacity of 350 mAhg(-1) at the current density of 20 mAg(-1). However, hybrid ion battery exhibited sharp decay in capacity owing to volume expansion of SnO2 based cathodes. This work will provide a new insight for synthesis of electrode materials for energy storage devices. (C) 2019 Elsevier Inc. All rights reserved.
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