期刊
ADVANCED ENERGY MATERIALS
卷 5, 期 8, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.201401945
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资金
- National Research Foundation of Korea (NRF) [K20704000003TA050000310]
- Global Research Laboratory (GRL) Program by the Korean Ministry of Education, Science and Technology (MEST)
- Korea Insitute of Energy Technology Evaluation and Planning (KETEP) - Korea government Ministry of Knowledge Economy [2011T100100369]
- WCU (World Class University) program through the National Research Foundation of Korea - Ministry of Education, Science and Technology [R31-10092]
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 (E-g > 2 eV). Here, porous TiNb2O7 microspheres (PTNO MSs) are prepared via a facile solvothermal reaction. PTNO MSs have a particle size of approximate to 1.2 mu m 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 approximate to 265 mAh g(-1), remarkable rate capability (approximate to 143 mAh g(-1) at 100 C) and durable long-term cyclability (approximate to 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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