nn0c06221_si_001.pdf (3.98 MB)
Janus Conductive/Insulating Microporous Ion-Sieving Membranes for Stable Li–S Batteries
journal contribution
posted on 2020-09-09, 08:31 authored by Borui Liu, Mahdiar Taheri, Juan F. Torres, Zelio Fusco, Teng Lu, Yun Liu, Takuya Tsuzuki, Guihua Yu, Antonio TricoliLithium–sulfur
batteries are one of the most promising next-generation
high-density energy storage systems. Despite progress, the poor electrical
conductivity and cycling stability of sulfur cathodes still hinder
their practical implementation. Here, we developed a facile approach
for the engineering of Janus double-sided conductive/insulating microporous
ion-sieving membranes that significantly enhance recharge efficiency
and long-term stability of Li–S batteries. Our membrane consists
of an insulating Li-anode side and an electrically conductive S-cathode
side. The insulating side consists of a standard polypropylene separator,
while the conductive side is made of closely packed multilayers of
high-aspect-ratio MOF/graphene nanosheets having a thickness of few
nanometers and a specific surface area of 996 m2 g–1 (MOF, metal–organic framework). Our models
and experiments reveal that this electrically conductive microporous
nanosheet architecture enables the reuse of polysulfide trapped in
the membrane and decreases the polysulfide flux and concentration
on the anode side by a factor of 250× over recent microporous
membranes made of granular MOFs and standard battery separators. Notably,
Li–S batteries using our Janus microporous membranes achieve
an outstanding rate capability and long-term stability with 75.3%
capacity retention over 1700 cycles. We demonstrate the broad applicability
of our high-aspect-ratio MOF/graphene nanosheet preparation strategy
by the synthesis of a diverse range of MOFs, including ZIF-67, ZIF-8,
HKUST-1, NiFe-BTC, and Ni-NDC, providing a flexible approach for the
design of Janus microporous membranes and electrically conductive
microporous building blocks for energy storage and various other electrochemical
applications.
History
Usage metrics
Categories
Keywords
battery separatorssurface areaelectrochemical applicationsrecharge efficiencyZIFconductive S-cathode siderate capabilityHKUSTconductive microporous building blockspolypropylene separator1700 cyclesMOFpolysulfide fluxanode sideJanus microporous membranesenergy storagebatterieconductive microporous nanosheet ar...cycling stabilitymicroporous membranesenergy storage systemsLi-anode sidesulfur cathodesconductive side
Licence
Exports
RefWorks
BibTeX
Ref. manager
Endnote
DataCite
NLM
DC