As a promising cathode material, selenium has attracted a great deal of research interest due to its high theoretical capacity analogous to sulfur in lithium-chalcogen batteries. However, unlike S cathodes,...
Li-confinable
core–shell hosts have been extensively studied
because they mitigate Li dendrite growth and volume change by reducing
the effective current density and storing Li inside the core space
during consecutive cycling. However, despite these fascinating features,
these hosts suffer from unwanted Li growth on their surface (i.e.,
top plating) due to the carbon shell hindering Li-ion movement especially
at higher current densities and capacities, resulting in poor electrochemical
performance. In this study, we propose a one-dimensional porous Li-confinable
host with lithiophilic Au (Au@PHCF), which is synthesized by a scalable
dual-nozzle electrospinning. Because of the well-interconnected conductive
networks forming three-dimensional structure, porous shell design
enabling facile Li-ion transport, and hollow core space with lithiophilic
Au storing metallic Li, the Au@PHCF can suppress the Li top plating
and improve the Li stripping/plating efficiency compared to their
counterparts even at 5 mA cm–2, eventually achieving
stable cycling performances of the LiFePO4 full cell and
Au@PHCF-Li symmetric cell for over 1000 and 2000 cycles, respectively.
Finite element analysis reveals that the structural merit and lithiophilicity
of Au enable fast reversible Li operation at the designated core space
of the Au@PHCF, implying that the structural design of the Li-confinable
host is crucial for the stable operation of promising Li-metal batteries
at a practical test level.
The self-assembled 3D hierarchical structure with a n-BA organic capping layer in the Pb–Sn perovskite framework provides the dual advantages of the stability and efficient charge carrier movement, resulting in boosting device performance.
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