【摘 要】
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The selection of the most suitable crystal structure for ions storage and the investigation of the corresponding reaction mechanism is still an ongoing challeng
【机 构】
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State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University
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The selection of the most suitable crystal structure for ions storage and the investigation of the corresponding reaction mechanism is still an ongoing challenge for the development of Mg-based batteries.In this article,high flexible graphene network supporting different crystal structures of Nb2O5 (TT-Nb2O5@rGO and T-Nb2O5@rGO) are successfully synthesized by a spray-drying-assisted approach.The three-dimensional graphene framework provides high conductivity and avoids the aggregation of Nb2O5 nanoparticles.When employed as electrode materials for energy storage applications,TI-Nb2O5 delivers a higher discharge capacity of 129.5 rnAh g-1,about twice that of T-Nb2O5 for Mg-storage,whereas,T-Nb2O5 delivers a much higher capacity (162 mAh g-1) compared with TT-Nb2O5 (129 mAh g-1) for Li-storage.Detailed investigations reveal the Mg intercalation mechanism and lower Mg2+ migration barriers,faster Mg2+ diffusion kinetics of TT-Nb2O5 as cathode material for Mg-storage,and the faster Li+ diffusion kinetics,shorter diffusion distance of T-Nb2O5 as cathode material for Li-storage.Our work demonstrates that exploring the proper crystal structure of Nb2O5 for different ions storage is necessary.
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