Abstract
This study reports an approach to achieving stable 2 and 3 Li+ insertion, respectively, into vanadium pentoxide (V2O5) as lithium-ion battery (LIB) cathode materials using a core-shell structure based on a self-standing carbon nanofiber (CNF) membrane fabricated by an electrospinning process. Uniform coaxial V2O5 shells are coated onto continuous CNF cores via a pulsed electrodeposition. The materials analyses confirm that the V2O5 shell after 4 h of thermal annealing at 300 °C forms a partially hydrated amorphous structure. SEM and TEM images indicate that the uniform 30–50 nm thick V2O5 shell forms an intimate interface with the CNF core. Lithium insertion capacities up to 291 and 429 mAh g−1 are achieved in the voltage ranges of 4.0–2.0 V and 4.0–1.5 V, respectively, which are in good agreement with the theoretical values of 294 mAh g−1 for 2 Li+/V2O5 insertion and 441 mAh g−1 for 3 Li+/V2O5 insertion into crystalline V2O5 materials. Moreover, after 100 cycles, remarkable retention rates of 97% and 70% are obtained for 2 Li+/V2O5 and 3 Li+/V2O5 insertion, respectively. These results reveal that it is potentially feasible to fabricate the core-shell structure with electrospinning and electrodeposition processes to break the intrinsic limits of V2O5 and enabling this high-capacity cathode materials for future LIBs.
Original language | English |
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Pages (from-to) | 144-154 |
Number of pages | 11 |
Journal | Electrochimica Acta |
Volume | 269 |
DOIs | |
State | Published - Apr 10 2018 |
Externally published | Yes |
Funding
We would like to thank Jacob Hughes and Brice Lacroix at Kansas State University (KSU) for the Raman Spectroscopy analysis, Shah Valloppilly at the University of Nebraska Center for Materials and Nanoscience (NCMN) for XRD analysis, Steve Michalski at NCMN for BET measurements, Xingzhang Li and Anand Sarella at NCMN for TEM imaging, and Dan Boyle of KSU for helping with SEM imaging. We would also like to give special thanks to Manomi Perera, Chamara Gunawardana and Christer Aakeröy of KSU for their help in the TGA analysis and Dr. Changsang Yun of Seoul National University for assistance in electrospinning nanofibers. This work was supported by a NASA grant NNX13AD42A and NSF grants CBET-1703263 and DMR-1707585 . We would like to thank Jacob Hughes and Brice Lacroix at Kansas State University (KSU) for the Raman Spectroscopy analysis, Shah Valloppilly at the University of Nebraska Center for Materials and Nanoscience (NCMN) for XRD analysis, Steve Michalski at NCMN for BET measurements, Xingzhang Li and Anand Sarella at NCMN for TEM imaging, and Dan Boyle of KSU for helping with SEM imaging. We would also like to give special thanks to Manomi Perera, Chamara Gunawardana and Christer Aakeröy of KSU for their help in the TGA analysis and Dr. Changsang Yun of Seoul National University for assistance in electrospinning nanofibers. This work was supported by a NASA grant NNX13AD42A and NSF grants CBET-1703263 and DMR-1707585.
Keywords
- Carbon nanofiber network
- Electrospinning
- Lithium ion battery
- Pulsed electrodeposition
- Vanadium pentoxide