Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 850, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2020.156808
Keywords
T-Nb2O5; Quantum dots; Biomass carbon; Lithium-ion supercapacitor
Categories
Funding
- Postgraduate Research & Practice Innovation Program of Jiangsu Province [KYCX19_2101]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
- Natural Science Foundation of Shandong Province, China [ZR2017MEM019]
- Testing Center of Yangzhou University
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Quantum dots are utilized in lithium-ion capacitors to reduce stress, improve dynamics, and shorten ion migration distance. In this study, Nb2O5 quantum dots coated with biomass carbon are used as the anode material, providing stable electrode structure and high storage capacity even after 3000 cycles.
Quantum dots can reduce volumetric stress, improve anodic dynamics and shorten migration distance of lithium ions. In this work, Nb2O5 quantum dots (about 4 nm) coated with heteroatom biomass carbon (protein) are used as anode material (Nb2O5@NC) of lithium-ion capacitor. High dispersal quantum dots are prepared by strong associated reaction of amino acids (egg white) and metal cations (Nb5+). The Nb2O5@NC nanostructure can effectively avoid the aggregation of Nb2O5 quantum dots and adjust the mechanical stress caused by volume change. In addition to the enhanced electrical conductivity, biomass carbon also can maintain the stable solid-liquid interface to enhance the stability of electrode structure. In fact, Nb2O5@NC electrode still holds 82.1% storage capacity after 3000 cycles. (C) 2020 Elsevier B.V. All rights reserved.
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