Three-dimensional mesoporous γ-Fe2O3@carbon nanofiber network as high performance anode material for lithium- and sodium-ion batteries
Open Access
- 10 April 2020
- journal article
- research article
- Published by IOP Publishing in Nanotechnology
- Vol. 31 (15), 155401
- https://doi.org/10.1088/1361-6528/ab6433
Abstract
Electrode materials that can function well in both lithium-ion batteries (LIBs) and sodium-ion batteries (SIBs) are desirable for electrochemical energy storage applications, especially under high rate. In this work, a three-dimensional (3D) mesoporous gamma-Fe2O3@carbon nanofiber (gamma-Fe2O3@CNF) mat has been successfully synthesized by sol-gel based electrospinning and carbonization. It delivers a specific capacity of 820 mAh g(-1) at 0.5 C after 250 cycles, 430 mAh g(-1) at 6 C after 1000 cycles, and 222 mAh g(-1) at ultrahigh rate of 60 C for LIBs, while for SIBs it delivers a specific capacity of 360 mAh g(-1) at 1 C after 1000 cycles and 130 mAh g(-1) at 60 C. Besides, the result of ex situ microstructure examination shows the polycrystalline nature of gamma-Fe2O3 nanoparticle still exists in LIB even after 1000 cycles, while it vanishes in SIB, suggesting that the relatively larger volume expansion occurred during Na+ insertion/deinsertion, resulting in pulverization of the particles. The CNFs maintained their pristine 3D network structure after the charge/discharge, which demonstrated the critical role of a robust conductive electrode in promoting fast Li+/Na+ transportation. More importantly, they act as an electrical bridge between Li+/Na+ and gamma-Fe2O3 nanoparticles, therefore suppressing the cell impedance growth and gamma-Fe2O3 volume expansion, resulting in the enhancement in both cyclic and rate capability.Funding Information
- National Science Foundation of Guangdong Province (2017A030310433)
- Innovation Team of Hunan Province (2018RS3091)
- National Natural Science Foundation of China (11472236, 11802318)
- National Key Research and Development Program of China (2016YFA0201001)
- Shenzhen Science and Technology Innovation Committee (JCYJ20170818155200084, JCYJ20170818155813437)
- Pearl River Talent Plan (2017GC010051)
- Engineering Research Center of Nano-Geo Materials of Ministry of Education of China University of Geosciences (NGM2018KF008)
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