Journal
JOURNAL OF SOLID STATE CHEMISTRY
Volume 299, Issue -, Pages -Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jssc.2021.122136
Keywords
Niobium pentoxide; Tetragonal phase; SiO2; Lithium-ion batteries
Funding
- National Natural Science Foundation of China [51972301]
- Youth Innovation Promotion Association of CAS
- Youth Innovation Foundation of DICP [ZZBS201708, 2018RJ03]
- National Key Research and Development Project [2019YFA0705600]
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In this study, pure-phase metastable tetragonal niobium pentoxide (M-Nb2O5) was successfully synthesized using amorphous SiO2 shells as a confinement agent. The pure-phase M-Nb2O5 showed promising physical and electrochemical performance as an anode material for lithium-ion batteries.
It's challenging to obtain pure-phase metastable tetragonal niobium pentoxide (M-Nb2O5) by conventional heating methods, due to the thermodynamical stable temperature region of M-Nb2O5 partially overlaps with that of H- or T-type Nb2O5. Herein, the pure-phase M- Nb2O5 is synthesized by utilizing the confinement of amorphous SiO2 shells, and the pure-phase M-Nb2O5 (without SiO2) is investigated as anode material of lithium-ion batteries. The shells can not only cut off the mutual integration among Nb2O5 particles, but also inhibit the rearrangement and mobility of the atoms inside via forming Si-O-Nb bond at the interface, thus could widen the thermodynamic and kinetic stability stable regions of the M-Nb2O5. The physical and electrochemical performance of pure M-Nb2O5 (without SiO2) is characterized as the anode material of lithium-ion batteries, which exhibits an initial capacity of 246 mAh g(-1), unprecedented high-rate performance (approximate to 86 mAh g(-1) at 4.0 A g(-1)) and excellent cycling stability (approximate to 78 mAh g(-1) at 2.0 A g(-1) after 1000 cycles).
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