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Graphene–Metal–Organic Framework Composite Sulfur Electrodes for Li–S Batteries with High Volumetric Capacity
journal contribution
posted on 2020-08-05, 17:38 authored by Avery
E. Baumann, Julia R. Downing, David A. Burns, Mark C. Hersam, V. Sara ThoiIn
an age of rapid acceleration toward next-generation energy storage
technologies, lithium–sulfur (Li–S) batteries offer
the desirable combination of low weight and high specific energy.
Metal–organic frameworks (MOFs) have been recently studied
as functionalizable platforms to improve Li–S battery performance.
However, many MOF-enabled Li–S technologies are hindered by
low capacity retention and poor long-term performance due to low electronic
conductivity. In this work, we combine the advantages of a Zr-based
MOF-808 loaded with sulfur as the active material with a graphene/ethyl
cellulose additive, leading to a high-density nanocomposite electrode
requiring minimal carbon. Our electrochemical results indicate that
the nanocomposites deliver enhanced specific capacity over conventionally
used carbon/binder mixtures, and postsynthetic modification of the
MOF with lithium thiophosphate results in further improvement. Furthermore,
the dense form factor of the sulfur-loaded MOF–graphene nanocomposite
electrodes provides high volumetric capacity compared to other works
with significantly more carbon additives. Overall, we have demonstrated
a proof-of-concept paradigm where graphene nanosheets facilitate improved
charge transport because of enhanced interfacial contact with the
active material. This materials engineering approach can likely be
extended to other MOF systems, contributing to an emerging class of
two-dimensional nanomaterial-enabled Li–S batteries.
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functionalizable platformsperformancecharge transportMOF systemsnext-generation energy storage tech...proof-of-concept paradigmHigh Volumetric Capacitymaterials engineering approachelectrochemical resultsZr-based MOF -808lithium thiophosphate resultsgraphene nanosheetsnanocomposite electrodebatteriecarbon additivescapacity retentionLitechnologypostsynthetic modificationform factor
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