Journal
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
Volume 842, Issue -, Pages 82-88Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jelechem.2019.04.042
Keywords
Lithium-ion capacitors; Anode materials; Nb2O5; Pseudocapacitance; T-Nb2O5/N-doped carbon nanosheets
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Funding
- National Natural Science Foundation of China [U1802256, 51504139, 51672128, 21773118]
- Key Research and Development Program in Jiangsu Province [BE2018122]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
- Graduate Innovation Program of Jiangsu Province [KYLX16_0341]
- Outstanding Doctoral Dissertation in NUAA [BCXJ16-07]
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Lithium ion capacitors combine the complementary advantageous characteristics of batteries and super capacitors are expected to deliver both high energy and high power density. However, this technology suffers from the kinetics imbalance between battery electrode and capacitive electrode. Here, two dimensional T-Nb2O5/N-doped carbon nanosheets with a well-continuous ionic/electronic conducting network demonstrate superior rate capability of 142.3 mA h g(-1) at 20 C (1 C = 200 mA g(-1)). A majority of charge storage in the T-Nb2O5/N-doped carbon nanosheets was proved to be intercalation pseudocapacitive processes by kinetic analysis, enabling fast charge storage performance. A lithium ion capacitor is based upon these T-Nb2O5/N-doped carbon nanosheets was successfully fabricated, demonstrating high energy density (70.3 W h kg(-1)) and high power density (16,014 W kg(-1)).
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