Abstract
A novel binary nanocomposite, ZnO/nitrogen-doped graphene (ZnO/NG), is synthesized via a facile solution method. In this prepared ZnO/NG composite, highly-crystalline ZnO nanoparticles with a size of about 10 nm are anchored uniformly on the N-doped graphene nanosheets. Electrochemical properties of the ZnO/NG composite as anode materials are systematically investigated in lithium-ion batteries. Specifically, the ZnO/NG composite can maintain the reversible specific discharge capacity at 870 mAh g−1 after 200 cycles at 100 mA g−1. Besides the enhanced electronic conductivity provided by interlaced N-doped graphene nanosheets, the excellent lithium storage properties of the ZnO/NG composite can be due to nanosized structure of ZnO particles, shortening the Li+ diffusion distance, increasing reaction sites, and buffering the ZnO volume change during the charge/discharge process.
Highlights
Lithium-ion batteries (LIBs) are one of the most promising modern electrochemical devices for energy storage, due to their high voltage, high energy density, and long lifespan [1,2,3,4]
The N1s spectrum of the ZnO/nitrogen-doped graphene (ZnO/N-doped graphene (NG)) composite shown in Figure 2d can be attributable to attributable to the pyridinic N, pyrrolic N, and graphitic N atoms doped in graphene, according to the pyridinic
A novel ZnO/nitrogen-doped graphene (ZnO/NG) nanocomposite was synthesized via a facile solution method
Summary
Lithium-ion batteries (LIBs) are one of the most promising modern electrochemical devices for energy storage, due to their high voltage, high energy density, and long lifespan [1,2,3,4]. A lot of effort has been devoted to conquer the above-mentioned shortcomings and a series of methods have been performed to improve properties of ZnO electrode These methods include (i) preparing ordered ZnO nanostructured materials [18,19,20,21]; (ii) compositing ZnO with carbon materials [5,15,16,17]; (iii) doping with other metal oxides [22,23,24]. These techniques can improve conductivity, promote the lithiation/delithiation process, or buffer volume changes to mitigate the pulverization of the active particles.
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