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

Journal Article · · Molecules
ORCiD logo [1];  [2];  [2];  [3];  [4];  [5]; ORCiD logo [5];  [6]
  1. Shandong Univ. of Science and Technology, Qingdao (China). School of Materials Science and Engineering; Xiamen Univ. (China). State Key Lab. for Physical Chemistry of Solid Surface. Collaborative Innovation Center of Chemistry for Energy Materials. College of Chemistry and Chemical Engineering. Dept. of Chemistry; DOE/OSTI
  2. Xiamen Univ. (China). State Key Lab. for Physical Chemistry of Solid Surface. Collaborative Innovation Center of Chemistry for Energy Materials. College of Chemistry and Chemical Engineering. Dept. of Chemistry
  3. Binzhou Univ. (China). College of Chemical Engineering and Safety
  4. Univ. of California, San Diego, CA (United States). Dept. of NanoEngineering
  5. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Spallation Neutron Source (SNS). Neutron Scattering Division
  6. Xiamen Univ. (China). State Key Lab. for Physical Chemistry of Solid Surface. Collaborative Innovation Center of Chemistry for Energy Materials. College of Chemistry and Chemical Engineering. Dept. of Chemistry; Xiamen Univ. (China). School of Energy Research
+ Show Author Affiliations

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.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1628495
Journal Information:
Molecules, Journal Name: Molecules Journal Issue: 4 Vol. 25; ISSN MOLEFW; ISSN 1420-3049
Publisher:
MDPICopyright Statement
Country of Publication:
United States
Language:
English

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