Mixed-Metal–Organic
Framework with Effective
Lewis Acidic Sites for Sulfur Confinement in High-Performance Lithium–Sulfur
Batteries
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Abstract
The mixed-metal–organic framework
approach and a representative
zirconium–metalloporphyrin framework (MOF-525) have been developed
to create novel sulfur hosts and Li–S batteries. The different
local environments at the centers of the porphyrin moieties in a series
of MMOFsMOF-525(2H), MOF-525(FeCl), and MOF-525(Cu)have
led to their different behaviors for the confinement of sulfur and
thus Li–S batteries. The unique structure of MOF-525(Cu) has
enabled each Cu<sup>2+</sup> site to offer two Lewis acidic sites,
featuring it as a very powerful MOF host for the inclusion of sulfur
and polysulfides. The S@MOF-525(Cu) cathode has demonstrated the best
performance among all reported sulfur/MOFs composite cathode materials,
with a reversible capacity of about 700 mAh/g at 0.5 C after 200 cycles