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Rational optimization of substituted α–MnO2 cathode for aqueous zinc–ion battery

Journal Article · · Energy Storage (Online)
DOI:https://doi.org/10.1002/est2.633· OSTI ID:2382639
 [1];  [2];  [2];  [2];  [2]
  1. State Univ. of New York (SUNY) at Stony Brook, NY (United States)
  2. State Univ. of New York (SUNY) at Stony Brook, NY (United States); Brookhaven National Laboratory (BNL), Upton, NY (United States)
Density functional theory (DFT) is utilized to explore the effects of increasing concentrations of vanadium (V) and chromium (Cr) substitution on the discharge of α-MnO2 cathode in hydrated zinc-ion batteries (ZIBs). During H+-intercalation and Zn2+-intercalation, Cr-substitution proves to be more effective than V-substitution in promoting discharge behaviors. Transitioning from Mn0.875Cr0.125O2, Mn0.75Cr0.25O2 to Mn0.625Cr0.375O2 is found to consistently enhance the discharge voltage, along with improved tunnel structure retention and volume expansion suppression. In comparison, the promoting effect of increasing V-substitution is relatively small at initial discharge stages and leads to degradation at later stages, primarily due to an increased concentration of unstable Mn2+ ion. The superior effect of Cr-substitution is attributed to the unique atomic and electronic structures of substituted Cr4+ and reduced Cr3+ ions during discharge. These ions serve as active electron acceptors to limit the formation of Mn3+ and Mn2+ ions, and as anchors to stabilize the α-MnO2 framework and intercalated H+/Zn2+ ions, respectively. Finally, our study highlights fine-tuning through substitution to enhance the performance of α-MnO2-based cathode materials in ZIBs.
Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States); Energy Frontier Research Centers (EFRC) (United States). Center for Mesoscale Transport Properties (m2M)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0012673; SC0012704
OSTI ID:
2382639
Report Number(s):
BNL--225760-2024-JAAM
Journal Information:
Energy Storage (Online), Journal Name: Energy Storage (Online) Journal Issue: 4 Vol. 6; ISSN 2578-4862
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English

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