High capacity monoclinic Nb₂O₅ and semiconducting NbO₂ composite as high-power anode material for Li-Ion batteries
Niobium pentoxide, Nb2O5, is an intercalation-type material with a high theoretical capacity of ∼404 mAh g−1 for Li-ion batteries. However, electrochemical properties of Nb2O5 largely depend on its various polymorphs with different crystal structures, and their low electrical conductivity acts as th...
| Main Authors: | , , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2021
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| Online Access: | https://hdl.handle.net/10356/151204 |
| _version_ | 1826129465377292288 |
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| author | Park, Hyunjung Lee, Dongsoo Song, Taeseup |
| author2 | School of Chemical and Biomedical Engineering |
| author_facet | School of Chemical and Biomedical Engineering Park, Hyunjung Lee, Dongsoo Song, Taeseup |
| author_sort | Park, Hyunjung |
| collection | NTU |
| description | Niobium pentoxide, Nb2O5, is an intercalation-type material with a high theoretical capacity of ∼404 mAh g−1 for Li-ion batteries. However, electrochemical properties of Nb2O5 largely depend on its various polymorphs with different crystal structures, and their low electrical conductivity acts as the main obstacle. Here, we report high-temperature calcined monoclinic Nb2O5 and semiconducting NbO2 composite as a high-power anode material. Monoclinic Nb2O5 itself as a main active material shows a high capacity of ∼280 mAh g−1, and NbO2 with a small band gap of ∼0.5 eV not only improves electrical conductivity but also gives a capacity of ∼110 mAh g−1. To have a synergic effect of these two materials, the Nb2O5/NbO2 composite is prepared via simple post-calcination of as-prepared Nb2O5 under a reduction atmosphere. It shows a discharge capacity of ∼214 mAh g−1 at 0.05 C, a high initial Coulombic efficiency of 94.7%, a superior rate capability of ∼40 mAh g−1 at 100 C, and a robust cycle performance of 81% retention over 900 cycles. |
| first_indexed | 2024-10-01T07:41:03Z |
| format | Journal Article |
| id | ntu-10356/151204 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T07:41:03Z |
| publishDate | 2021 |
| record_format | dspace |
| spelling | ntu-10356/1512042021-08-31T06:43:31Z High capacity monoclinic Nb₂O₅ and semiconducting NbO₂ composite as high-power anode material for Li-Ion batteries Park, Hyunjung Lee, Dongsoo Song, Taeseup School of Chemical and Biomedical Engineering Engineering::Chemical engineering Lithium Ion Batteries Anode Niobium pentoxide, Nb2O5, is an intercalation-type material with a high theoretical capacity of ∼404 mAh g−1 for Li-ion batteries. However, electrochemical properties of Nb2O5 largely depend on its various polymorphs with different crystal structures, and their low electrical conductivity acts as the main obstacle. Here, we report high-temperature calcined monoclinic Nb2O5 and semiconducting NbO2 composite as a high-power anode material. Monoclinic Nb2O5 itself as a main active material shows a high capacity of ∼280 mAh g−1, and NbO2 with a small band gap of ∼0.5 eV not only improves electrical conductivity but also gives a capacity of ∼110 mAh g−1. To have a synergic effect of these two materials, the Nb2O5/NbO2 composite is prepared via simple post-calcination of as-prepared Nb2O5 under a reduction atmosphere. It shows a discharge capacity of ∼214 mAh g−1 at 0.05 C, a high initial Coulombic efficiency of 94.7%, a superior rate capability of ∼40 mAh g−1 at 100 C, and a robust cycle performance of 81% retention over 900 cycles. This work was supported by the Korea Institute of Energy Technology Evaluation and Planning (KETEP) and the Ministry of Trade, Industry and Energy of the Republic of Korea through the research on Li-ion batteries (No. 20168510050080), Basic Science Research Program through the National Research Foundation of Korea funded by the Ministry of Science, ICT (2016R1C1B2007299) and the research fund of Hanyang University (HY-2017). 2021-08-31T06:43:31Z 2021-08-31T06:43:31Z 2019 Journal Article Park, H., Lee, D. & Song, T. (2019). High capacity monoclinic Nb₂O₅ and semiconducting NbO₂ composite as high-power anode material for Li-Ion batteries. Journal of Power Sources, 414, 377-382. https://dx.doi.org/10.1016/j.jpowsour.2019.01.015 0378-7753 0000-0002-1174-334X https://hdl.handle.net/10356/151204 10.1016/j.jpowsour.2019.01.015 2-s2.0-85060028848 414 377 382 en Journal of Power Sources © 2019 Elsevier B.V. All rights reserved. |
| spellingShingle | Engineering::Chemical engineering Lithium Ion Batteries Anode Park, Hyunjung Lee, Dongsoo Song, Taeseup High capacity monoclinic Nb₂O₅ and semiconducting NbO₂ composite as high-power anode material for Li-Ion batteries |
| title | High capacity monoclinic Nb₂O₅ and semiconducting NbO₂ composite as high-power anode material for Li-Ion batteries |
| title_full | High capacity monoclinic Nb₂O₅ and semiconducting NbO₂ composite as high-power anode material for Li-Ion batteries |
| title_fullStr | High capacity monoclinic Nb₂O₅ and semiconducting NbO₂ composite as high-power anode material for Li-Ion batteries |
| title_full_unstemmed | High capacity monoclinic Nb₂O₅ and semiconducting NbO₂ composite as high-power anode material for Li-Ion batteries |
| title_short | High capacity monoclinic Nb₂O₅ and semiconducting NbO₂ composite as high-power anode material for Li-Ion batteries |
| title_sort | high capacity monoclinic nb₂o₅ and semiconducting nbo₂ composite as high power anode material for li ion batteries |
| topic | Engineering::Chemical engineering Lithium Ion Batteries Anode |
| url | https://hdl.handle.net/10356/151204 |
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