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| Home > Publications database > NASICON‐NaV$_{0.25}$Al$_{0.25}$Nb$_{1.5}$(PO$_4$)$_3$/C: A High‐Rate and Robust Anode for Fast Charging and Long‐Life Sodium‐Ion Batteries |
| Journal Article | PUBDB-2025-03938 |
; ; ; ; ; ; ; ;
2025
Wiley-VCH
Weinheim
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Please use a persistent id in citations: doi:10.1002/adma.202419417
Abstract: Nb-based NAtrium Super Ionic CONductor (NASICON) frameworks (e.g., Nb2(PO4)3 and Na1.5V0.5Nb1.5(PO4)3) are emerging as the attractive Na-ion anodes due to their lower intercalation voltage (≈1.4–1.2 V vs Na+/Na0) and higher storage capacities (≈140–160 mAh g−1). However, their practical realization is limited by moderate cycle life and rate performances. In this work, a carbon-coated NASICON-NaV0.25Al0.25Nb1.5(PO4)3 (NaVAlNb/C) anode is unveiled for fast charging Na-ion batteries. The incorporation of Al3+ increases covalency of NASICON and creates disordered Na-ion sublattice as observed by X-ray diffraction and nuclear magnetic resonance spectroscopy measurements. Besides, the carbon-coating and particle downsizing produces facile electron and ion percolation network. Accordingly, the NaVAlNb/C anode renders extraordinary rate performances (80 mAh g−1 at 20C) with longer cycling stability (95.2% retention after 5000 cycles at 10C). Climbing image nudged elastic band calculations reveal reduced Na-ion migration barrier (202 meV) for NaVAlNb/C. Most importantly, a full Na-ion cell based on Na4V2(PO4)3 cathode and NaVAlNb/C anode is demonstrated with a high-power density (6493 W kg−1) and long-cycle life (3000 cycles at 20C), which are far excellent compared to the state-of-the-art NASICON-based cells. This work demonstrates the significance of carbon coating and chemical tuning to tailor high-rate NASICON anodes, which can produce fast-charging Na-ion batteries.
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