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Download fileOne-Dimensional Porous Li-Confinable Hosts for High-Rate and Stable Li-Metal Batteries
journal contribution
posted on 23.06.2022, 21:13 authored by Dong Woo Kang, Seong Soo Park, Hong Jun Choi, Jun-Ho Park, Ji Hoon Lee, Sang-Min Lee, Jeong-Hee Choi, Janghyuk Moon, Byung Gon KimLi-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.
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practical test levelpoor electrochemical performanceplating efficiency comparedhigher current densitieseffective current densityunwanted li growthstoring li insideli top platingion movement especiallyhollow core spacedesignated core spaceli symmetric celldimensional porous li4 </ submetal batteries licore spacemetal batteriesstable lipromising lili strippingion transportfull celldimensional structurevolume changestructural meritstructural designstable operationscalable dualnozzle electrospinninghosts sufferfascinating featuresextensively studiedcounterparts evenconsecutive cyclingconfinable hostsconfinable host2000 cycles