Vanadium-Substituted Tunnel Structured Silver Hollandite (Ag1.2VxMn8–xO16): Impact on Morphology and Electrochemistry
Journal Article
·
· Inorganic Chemistry
- Stony Brook Univ., NY (United States); Valparaiso Univ., IN (United States)
- Brookhaven National Lab. (BNL), Upton, NY (United States)
- Stony Brook Univ., NY (United States)
- Brookhaven National Lab. (BNL), Upton, NY (United States); Stony Brook Univ., NY (United States)
A series of tunnel structured vanadium-substituted silver hollandite (Ag1.2VxMn8- xO16, V = 0 – 1.4) samples is prepared and characterized through a combination of synchrotron Xray diffraction, synchrotron X-ray absorption spectroscopy, laboratory Raman spectroscopy and electron diffraction measurements. The oxidation states of the individual transition metals are characterized using V and Mn K-edge XAS data indicating the vanadium centers exist as V5+, and the Mn oxidation states decrease with increased V substitution to balance the charge. Scanning transmission electron microscopy of reduced materials shows reduction-displacement of silver metal at high levels of lithiation. In lithium batteries the V-substituted tunneled manganese oxide materials reveal previously unseen reversible non-aqueous Ag electrochemistry and exhibit up to 2.5x higher Li storage capacity relative to their unsubstituted counterparts. The highest capacity was observed for the Ag1.2(V0.8Mn7.2)O16∙0.8H2O material with an intermediate level of vanadium substitution, likely due to a combination of the atomic composition, the morphology of the particle, and the homogeneous distribution of the active material within the electrode structure where factors over multiple length scales contribute to the electrochemistry.
- Research Organization:
- Brookhaven National Laboratory (BNL), Upton, NY (United States); Energy Frontier Research Centers (EFRC) (United States). Center for Mesoscale Transport Properties (m2mt)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Grant/Contract Number:
- SC0012704
- OSTI ID:
- 1633605
- Alternate ID(s):
- OSTI ID: 1605446
- Report Number(s):
- BNL--216053-2020-JAAM
- Journal Information:
- Inorganic Chemistry, Journal Name: Inorganic Chemistry Journal Issue: 6 Vol. 59; ISSN 0020-1669
- Publisher:
- American Chemical Society (ACS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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