Szczegóły publikacji
Opis bibliograficzny
Delicate lattice modulation enables superior Na storage performance of $Na_{3}V_{2}(PO_{4})_{3}$ as both an anode and cathode material for sodium-ion batteries: understanding the role of calcium substitution for vanadium / Lina Zhao, Hailei Zhao, Zhihong Du, Jie Wang, Xuanyou Long, Zhaolin Li, Konrad ŚWIERCZEK // Journal of Materials Chemistry. A ; ISSN 2050-7488. — 2019 — vol. 7 iss. 16, s. 9807–9814. — Bibliogr. s. 9813–9814. — Publikacja dostępna online od: 2019-03-20
Autorzy (7)
- Zhao Lina
- Zhao Hailei
- Du Zhihong
- Wang Jie
- Long Xuanyou
- Li Zhaolin
- AGHŚwierczek Konrad
Dane bibliometryczne
| ID BaDAP | 121802 |
|---|---|
| Data dodania do BaDAP | 2019-05-21 |
| Tekst źródłowy | URL |
| DOI | 10.1039/c9ta00869a |
| Rok publikacji | 2019 |
| Typ publikacji | artykuł w czasopiśmie |
| Otwarty dostęp |  |
| Czasopismo/seria | Journal of Materials Chemistry, A |
Abstract
Na3V2(PO4)3 with a 3D open NASICON framework can accommodate a wide range of Na contents, which makes it capable of working as both a cathode and anode material. However, severe capacity degradation and inferior rate capability resulting from low electronic/ionic conductivities and poor structural stability have hindered its practical implementation. Herein, excellent sodium storage performance of Na3V2(PO4)3 is realized by delicate lattice modulation. Aliovalent Ca2+ substitution for V3+ increases both the electronic and ionic conductivities by producing electronic defects and enlarging the sodium ion migration channels. DFT calculations reveal that the fifth Na ion intercalation/deintercalation produces a large lattice volume change, which is possibly the origin of the poor redox reaction reversibility of Na3V2(PO4)3 at low potential (∼0.3 V vs. Na+/Na). The Ca2+ doping enhances significantly the structural stability to suppress the large crystal lattice distortion during the anode reaction process. The multiple effects enable superior rate-capability and ultralong cycle-life of Ca-doped Na3V2(PO4)3 as both a cathode and anode material. The symmetric full cell constructed with the optimized Na3V1.95Ca0.05(PO4)3@C electrode delivers a very high energy density of 166 W h kg−1 and an exceptional cycling stability (0.02% capacity decay per cycle over 2000 cycles at 10C rate). This study provides a feasible strategy for obtaining high-rate and long cycle-life electrode materials for high-efficiency energy storage.
