Abstract
O3-type layer-structured Na0 . 8[Ni1/5Fe1/5Co1/5Mn1/5Ti1/5]O2 (denoted as N0.8NFCMTO) has been investigated as a new cathode material for Na-ion batteries. The N0.8NFCMTO cathode delivers an initial discharge capacity of 107 mAhg−1 with excellent cycling stability of over 90% capacity retention after 100 cycles. This material delivers comparable capacity to that of previously reported layered cathode materials with multi-transition metal elements while showing an excellent rate capability and stable long cycle life. Synchrotron-based in situ X-ray diffraction and ex situ X-ray absorption spectroscopy investigations combined with quantitative refinement analysis reveal the reversible structural changes and charge compensation mechanism during sodium extraction/insertion, which is associated with the excellent cycling stability of the N0.8NFCMTO electrode.
Original language | English |
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Pages (from-to) | 23164-23171 |
Number of pages | 8 |
Journal | Ceramics International |
Volume | 45 |
Issue number | 17 |
DOIs | |
State | Published - 1 Dec 2019 |
Keywords
- Cathode
- In situ x-ray diffraction
- Layer-structured oxide
- Sodium-ion battery
- X-ray absorption spectroscopy