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Review of the Stability/Capacity Trade-off in Silver Hollandite Lithium Battery Cathodes

Journal Article · · MRS Advances
DOI:https://doi.org/10.1557/adv.2018.306· OSTI ID:1470270
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ABSTRACT

Highly detailed structural characterization is required to understand the discharge mechanism in order to effectively investigate α-MnO2structured lithium battery cathode materials. This paper discusses recent findings which elucidate the lithiation mechanism of silver-hollandite, AgxMn8O16. For Ag1.2Mn8O16, the structure is not significantly perturbed during the first 2 equivalents of lithiation and the electrochemistry is highly reversible. Upon 4 equivalents of lithiation, the structure becomes highly distorted, in correlation with capacity fade observed over 40 cycles. Notably, regarding capacity fade, modifications to Ag/Mn ratio are less impactful than modifications to the α-MnO2crystallite size. This is shown in comparisons of two materials with the same stoichiometry (Ag1.4Mn8O16) and differing crystallite size (10 and 15 nm).

Research Organization:
Energy Frontier Research Centers (EFRC) (United States). Center for Mesoscale Transport Properties (m2M)
Sponsoring Organization:
USDOE SC Office of Basic Energy Sciences (SC-22)
DOE Contract Number:
SC0012673;
OSTI ID:
1470270
Journal Information:
MRS Advances, Journal Name: MRS Advances Journal Issue: 14 Vol. 3; ISSN 2059-8521; ISSN applab
Publisher:
Materials Research Society (MRS)
Country of Publication:
United States
Language:
English

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energy storage (including batteries and capacitors)
charge transport
mesostructured materials