Porosity-controlled TiNb2O7 microspheres with partial nitridation as a practical negative electrode for high-power lithium-ion batteries
Titanium niobium oxide (TiNb2O7) has been recognized as a promising anode material for lithium-ion batteries (LIBs) in view of its potential to operate at high rates with improved safety and high theoretical capacity of 387 mAh g−1. However, it suffers from poor Li+ ion diffusivity and low electroni...
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sg-ntu-dr.10356-1065922019-12-06T22:14:40Z Porosity-controlled TiNb2O7 microspheres with partial nitridation as a practical negative electrode for high-power lithium-ion batteries Park, Hyunjung Wu, Hao Bin Song, Taeseup Paik, Ungyu Lou, David Xiong Wen School of Chemical and Biomedical Engineering DRNTU::Engineering::Materials::Energy materials Titanium niobium oxide (TiNb2O7) has been recognized as a promising anode material for lithium-ion batteries (LIBs) in view of its potential to operate at high rates with improved safety and high theoretical capacity of 387 mAh g−1. However, it suffers from poor Li+ ion diffusivity and low electronic conductivity originated from its wide band gap energy (Eg > 2 eV). Here, porous TiNb2O7 microspheres (PTNO MSs) are prepared via a facile solvothermal reaction. PTNO MSs have a particle size of ≈1.2 μm and controllable pore sizes in the range of 5–35 nm. Ammonia gas nitridation treatment is conducted on PTNO MSs to introduce conducting Ti1−xNbxN layer on the surface and form nitridated PTNO (NPTNO) MSs. The porous structure and conducting Ti1−xNbxN layer enhance the transport kinetics associated with Li+ ions and electrons, which leads to significant improvement in electrochemical performance. As a result, the NPTNO electrode shows a high discharge capacity of ≈265 mAh g−1, remarkable rate capability (≈143 mAh g−1 at 100 C) and durable long-term cyclability (≈91% capacity retention over 1000 cycles at 5 C). These results demonstrate the great potential of TiNb2O7 as a practical high-rate anode material for LIBs. 2015-02-02T03:39:05Z 2019-12-06T22:14:40Z 2015-02-02T03:39:05Z 2019-12-06T22:14:40Z 2015 2015 Journal Article Park, H., Wu, H. B., Song, T., Lou, D. X. W., & Paik, U. (2015). Porosity-controlled TiNb2O7 microspheres with partial nitridation as a practical negative electrode for high-power lithium-ion batteries. Advanced energy materials,5(8), 1401945-. 1614-6832 https://hdl.handle.net/10356/106592 http://hdl.handle.net/10220/24996 http://dx.doi.org/10.1002/aenm.201401945 en Advanced energy materials © 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. |
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DRNTU::Engineering::Materials::Energy materials Park, Hyunjung Wu, Hao Bin Song, Taeseup Paik, Ungyu Lou, David Xiong Wen Porosity-controlled TiNb2O7 microspheres with partial nitridation as a practical negative electrode for high-power lithium-ion batteries |
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Titanium niobium oxide (TiNb2O7) has been recognized as a promising anode material for lithium-ion batteries (LIBs) in view of its potential to operate at high rates with improved safety and high theoretical capacity of 387 mAh g−1. However, it suffers from poor Li+ ion diffusivity and low electronic conductivity originated from its wide band gap energy (Eg > 2 eV). Here, porous TiNb2O7 microspheres (PTNO MSs) are prepared via a facile solvothermal reaction. PTNO MSs have a particle size of ≈1.2 μm and controllable pore sizes in the range of 5–35 nm. Ammonia gas nitridation treatment is conducted on PTNO MSs to introduce conducting Ti1−xNbxN layer on the surface and form nitridated PTNO (NPTNO) MSs. The porous structure and conducting Ti1−xNbxN layer enhance the transport kinetics associated with Li+ ions and electrons, which leads to significant improvement in electrochemical performance. As a result, the NPTNO electrode shows a high discharge capacity of ≈265 mAh g−1, remarkable rate capability (≈143 mAh g−1 at 100 C) and durable long-term cyclability (≈91% capacity retention over 1000 cycles at 5 C). These results demonstrate the great potential of TiNb2O7 as a practical high-rate anode material for LIBs. |
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School of Chemical and Biomedical Engineering |
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School of Chemical and Biomedical Engineering Park, Hyunjung Wu, Hao Bin Song, Taeseup Paik, Ungyu Lou, David Xiong Wen |
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Article |
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Park, Hyunjung Wu, Hao Bin Song, Taeseup Paik, Ungyu Lou, David Xiong Wen |
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Park, Hyunjung |
title |
Porosity-controlled TiNb2O7 microspheres with partial nitridation as a practical negative electrode for high-power lithium-ion batteries |
title_short |
Porosity-controlled TiNb2O7 microspheres with partial nitridation as a practical negative electrode for high-power lithium-ion batteries |
title_full |
Porosity-controlled TiNb2O7 microspheres with partial nitridation as a practical negative electrode for high-power lithium-ion batteries |
title_fullStr |
Porosity-controlled TiNb2O7 microspheres with partial nitridation as a practical negative electrode for high-power lithium-ion batteries |
title_full_unstemmed |
Porosity-controlled TiNb2O7 microspheres with partial nitridation as a practical negative electrode for high-power lithium-ion batteries |
title_sort |
porosity-controlled tinb2o7 microspheres with partial nitridation as a practical negative electrode for high-power lithium-ion batteries |
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2015 |
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https://hdl.handle.net/10356/106592 http://hdl.handle.net/10220/24996 http://dx.doi.org/10.1002/aenm.201401945 |
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