Journal:Chemistry-An Asia Journal

Key Words:Li􀀀 S batteries · Bifunctional · High entropy selenide · Polysulfide conversion · Dendrite-free

Abstract:Lithium-sulfur (Li􀀀 S) batteries, recognized as one of the most
promising next-generation energy storage systems, are still
limited by the “shuttle effect” of soluble polysulfides (LiPSs) on
the cathode and the uncontrolled growth of lithium dendrites
on the anode. These issues are critical obstacles to their
practical application. Currently, many researchers have addressed
these challenges from a unilateral perspective. Herein,
we propose bifunctional hosts based on high-entropy selenides
(HE􀀀 Se) to simultaneously tackle the persistent problems on
both the positive and negative electrodes of Li􀀀 S batteries. On
the one hand, HE􀀀 Se interacts with polysulfides to promote
their conversion, effectively mitigating the shuttle effect. On the
other hand, HE􀀀 Se provides multiple lithophilic sites during the
initial nucleation of Li+, which reduces overpotential and
exhibits excellent lithophilicity and cyclic stability. As a result,
Li􀀀 S batteries incorporating the HE􀀀 Se hosts demonstrate
outstanding performance in terms of rate capability and cycling
stability. Additionally, the porous lithophilic HE􀀀 Se structure
offers sufficient nucleation sites, inhibits the growth of dendritic
lithium, and accommodates volume changes during charging
and discharging cycles. This study highlights the potential of
sulphophilic/lithophilic high-entropy materials in designing
advanced Li􀀀 S batteries and encourages further exploration in
this area.

Indexed by:Journal paper

Discipline:Natural Science

Translation or Not:no

Date of Publication:2024-08-15

Included Journals:SCI