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Mesoporous Tin‐Based Oxide Nanospheres/Reduced Graphene Composites as Advanced Anodes for Lithium‐Ion Half/Full Cells and Sodium‐Ion Batteries
Author(s) -
He Yanyan,
Li Aihua,
Dong Caifu,
Li Chuanchuan,
Xu Liqiang
Publication year - 2017
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201702225
Subject(s) - materials science , anode , non blocking i/o , lithium (medication) , mesoporous material , composite number , graphene , tin oxide , oxide , chemical engineering , tin , electrolyte , electrode , nanotechnology , composite material , metallurgy , chemistry , catalysis , medicine , biochemistry , engineering , endocrinology
The large volume variations of tin‐based oxides hinder their extensive application in the field of lithium‐ion batteries (LIBs). In this study, structure design, hybrid fabrication, and carbon‐coating approaches have been simultaneously adopted to address these shortcomings. To this end, uniform mesoporous NiO/SnO 2 @rGO, Ni‐Sn oxide@rGO, and SnO 2 @rGO nanosphere composites have been selectively fabricated. Among them, the obtained NiO/SnO 2 @rGO composite exhibited a high capacity of 800 mAh g −1 at 1000 mA g −1 after 400 cycles. The electrochemical mechanism of NiO/SnO 2 as an anode for LIBs has been preliminarily investigated by ex situ XRD pattern analysis. Furthermore, an NiO/SnO 2 @rGO‐LiCoO 2 lithium‐ion full cell showed a high capacity of 467.8 mAh g −1 at 500 mA g −1 after 100 cycles. Notably, the NiO/SnO 2 @rGO composite also showed good performance when investigated as an anode for sodium‐ion batteries (SIBs). It is believed that the unique mesoporous nanospherical framework, synergistic effects between the various components, and uniform rGO wrapping of NiO/SnO 2 shorten the Li + ion diffusion pathways, maintain sufficient contact between the active material and the electrolyte, mitigate volume changes, and finally improve the electrical conductivity of the electrode.