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Structural properties and electrochemical performance of different polymorphs of Nb_(2)O_(5) in magnesium-based batteries

查看全文 作　　者：Cunyuan [1]Pei;Yameng [1]Yin;Xiaobin [1,2]Liao;Fangyu [1]Xiong;Qinyou [1,3]An;Mengda [1]Jin;Yan [2]Zhao;Liqiang [1,3]Mai 高影响力作者 机构地区：[1]State Key Laboratory of Advanced Technology for Materials Synthesis and Processing,Wuhan University of Technology,Wuhan 430070,Hubei,China;[2]State Key Laboratory of Silicate Materials for Architectures,International School of Materials Science and Engineering,Wuhan University of Technology,Wuhan 430070,Hubei,China;[3]Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory,Xianhu Hydrogen Valley,Foshan 528200,Guangdong,China高影响力机构 出　　处：《Journal of Energy Chemistry》索引2021年第30卷第7期,共7页高影响力期刊 基　　金：supported by the National Natural Science Foundation of China(51972259,51832004,51521001);the Fundamental Research Funds for the Central Universities(WUT:2020III043GX,2020III015GX);Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory(XHT2020-003);the National Key Research and Development Program of China(2016YFA0202601);the Hubei Provincial Natural Science Foundation of China(2019CFB519)。 摘　　要：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 Nb2 O5(TTNb_(2)O_(5)@rGO and T-Nb_(2)O_(5)@rGO) are successfully synthesized by a spray-drying-assisted approach.The three-dimensional graphene framework provides high conductivity and avoids the aggregation of Nb2 O5 nanoparticles.When employed as electrode materials for energy storage applications,TT-Nb_(2)O_(5) delivers a higher discharge capacity of 129.5 mAh g^(-1), about twice that of T-Nb_(2)O_(5) for Mg-storage,whereas,T-Nb_(2)O_(5) delivers a much higher capacity(162 mAh g^(-1)) compared with TT-Nb_(2)O_(5)(129 mAh g^(-1)) for Li-storage.Detailed investigations reveal the Mg intercalation mechanism and lower Mg^(2+) migration barriers,faster Mg^(2+) diffusion kinetics of TT-Nb_(2)O_(5) as cathode material for Mg-storage,and the faster Li+ diffusion kinetics,shorter diffusion distance of T-Nb_(2)O_(5) as cathode material for Li-storage.Our work demonstrates that exploring the proper crystal structure of Nb2 O5 for different ions storage is necessary. 关 键 词：Crystal structure Nb_(2)O_(5) Mg-ion storage Li-ion storage Diffusion kinetics
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