Journal
ADVANCED MATERIALS
Volume 30, Issue 18, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201707122
Keywords
high rate; multidimensional nanostructures; sodium-ion batteries; synergistic effects; ultralong cycle life; V2O3
Categories
Funding
- Fundamental Research Funds for the Central Universities [2016III003, 2016IVA090, WUT: 2016III001]
- China Scholarship Council [201606955096]
- National Ten Thousand Talent Program of China
- Programme of Introducing Talents of Discipline to Universities [B17034]
- Students Innovation and Entrepreneurship Training Program [2016-CL-A1-29]
- National Natural Science Foundation of China [51521001, 51602239]
- International Postdoctoral Exchange Fellowship Program [20160025]
- Hubei Provincial Natural Science Foundation of China [2016CFB267]
- National Key Research and Development Program of China [2016YFA0202603]
- National Natural Science Fund for Distinguished Young Scholars [51425204]
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Conversion-type anodes with multielectron reactions are beneficial for achieving a high capacity in sodium-ion batteries. Enhancing the electron/ion conductivity and structural stability are two key challenges in the development of high-performance sodium storage. Herein, a novel multidimensionally assembled nanoarchitecture is presented, which consists of V2O3 nanoparticles embedded in amorphous carbon nanotubes that are then coassembled within a reduced graphene oxide (rGO) network, this materials is denoted V2O3 subset of C-NTs subset of rGO. The selective insertion and multiphase conversion mechanism of V2O3 in sodium-ion storage is systematically demonstrated for the first time. Importantly, the naturally integrated advantages of each subunit synergistically provide a robust structure and rapid electron/ion transport, as confirmed by in situ and ex situ transmission electron microscopy experiments and kinetic analysis. Benefiting from the synergistic effects, the V2O3 subset of C-NTs subset of rGO anode delivers an ultralong cycle life (72.3% at 5 A g(-1) after 15 000 cycles) and an ultrahigh rate capability (165 mAh g(-1) at 20 A g(-1), approximate to 30 s per charge/discharge). The synergistic design of the multidimensionally assembled nanoarchitecture produces superior advantages in energy storage.
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