Abstract
Graphene/ZnO composites with different contents of ZnO have been successfully synthesized via a liquid phase route. The structure, morphology, and electrochemical performances of the composites are investigated by XRD, Raman, SEM, TEM, AFM, and electrochemical measurement. The results reveal that ZnO nanoparticles wedged on the surface of the graphene nanosheets. The initial capacity of graphene/ZnO (1 : 1) reached 1155.27 mAh g−1, which increased 162.87 mAh g−1 compared with the initial capacity of graphene. This could be attributed to the unique structure of the prepared composite and synergies of graphene and ZnO in the lithium ion storage.
Highlights
Lithium ion batteries (LIBs) are essential components for hand-held electronic devices, electrical vehicles, and so forth [1]
The large specific surface could lead to the more probability to produce solid electrolyte interphase (SEI) because of the reaction between lithium ion and electrolyte on the graphene sheets surface, which increases the irreversible capacity of graphene as the anode
The graphene/ZnO composite is prepared as an anode for lithium ion battery via a liquid phase route
Summary
Lithium ion batteries (LIBs) are essential components for hand-held electronic devices, electrical vehicles, and so forth [1]. Graphene could not be used as anode material due to the high irreversible capacity and the low first coulombic efficiency [3,4,5,6] This may be related to its stacking and large specific surface. The GNS can prevent the aggregation of metal oxide nanoparticles, which makes a significant contribution to improving the conductivity of the composite Compared to these materials, ZnO has a theoretical capacity of 978 mAh g−1 [9], which makes it possible for the application as an anode material for lithium ion batteries, while ZnO [10, 11] is rarely studied in terms of lithium ion battery due to severe expansion and contraction during charge and discharge and low electrical conductivity [12]. The composite has higher reversible capacity and coulombic efficiency than graphene, which recommends it as a promising alternative anode material used for high energy lithium ion batteries
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