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Recognition of V3+/V4+/V5+ Multielectron Reactions in Na3V(PO4)2: A Potential High Energy Density Cathode for Sodium-Ion Batteries.


ABSTRACT: Na3V(PO4)2 was reported recently as a novel cathode material with high theoretical energy density for Sodium-ion batteries (SIBs). However, whether V3+/V4+/V5+ multielectron reactions can be realized during the charging process is still an open question. In this work, Na3V(PO4)2 is synthesized by using a solid-state method. Its atomic composition and crystal structure are verified by X-ray diffraction (XRD) and neutron diffraction (ND) joint refinement. The electrochemical performance of Na3V(PO4)2 is evaluated in two different voltage windows, namely 2.5-3.8 and 2.5-4.3 V. 51V solid-state NMR (ssNMR) results disclose the presence of V5+ in Na2-xV(PO4)2 when charging Na3V(PO4)2 to 4.3 V, confirming Na3V(PO4)2 is a potential high energy density cathode through realization of V3+/V4+/V5+ multielectron reactions.

SUBMITTER: Liu R 

PROVIDER: S-EPMC7070626 | biostudies-literature | 2020 Feb

REPOSITORIES: biostudies-literature

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Recognition of V<sup>3+</sup>/V<sup>4+</sup>/V<sup>5+</sup> Multielectron Reactions in Na<sub>3</sub>V(PO<sub>4</sub>)<sub>2</sub>: A Potential High Energy Density Cathode for Sodium-Ion Batteries.

Liu Rui R   Liang Ziteng Z   Xiang Yuxuan Y   Zhao Weimin W   Liu Haodong H   Chen Yan Y   An Ke K   Yang Yong Y  

Molecules (Basel, Switzerland) 20200224 4


Na<sub>3</sub>V(PO<sub>4</sub>)<sub>2</sub> was reported recently as a novel cathode material with high theoretical energy density for Sodium-ion batteries (SIBs). However, whether V<sup>3+</sup>/V<sup>4+</sup>/V<sup>5+</sup> multielectron reactions can be realized during the charging process is still an open question. In this work, Na<sub>3</sub>V(PO<sub>4</sub>)<sub>2</sub> is synthesized by using a solid-state method. Its atomic composition and crystal structure are verified by X-ray diffract  ...[more]

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