nz1c02486_si_006.mp4 (1.98 MB)
Operando Visualization of Morphological Evolution in Mg Metal Anode: Insight into Dendrite Suppression for Stable Mg Metal Batteries
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posted on 2021-12-08, 16:12 authored by Jin Hwan Kwak, Yunseo Jeoun, Si Hyoung Oh, Seungho Yu, Jae-Hong Lim, Yung-Eun Sung, Seung-Ho Yu, Hee-Dae LimRechargeable
Mg-metal batteries (RMBs) are considered promising
alternatives to conventional Li-ion batteries owing to their high
volumetric capacity and low cost. In addition, Mg anodes for RMBs
do not suffer from metal dendritic growth or internal short circuit.
However, the notion that Mg anodes are indeed dendrite-free has recently
been under debate, and further clarification is crucial for advancing
practical RMBs. In this work, we closely investigated Mg dendrite
behaviors under various electrochemical test conditions using operando observation techniques. The critical current density
inducing fatal Mg dendritic growth was defined by directly monitoring
the dendritic growth process leading to a short circuit. We further
propose a new strategy to regulate the dendrite growth by introducing
magnesiophilic sites of Au nanoseeds on a substrate. We not only elucidated
the effect of the applied current density and capacity utilization
on the Mg growth behaviors but also demonstrated the effect of magnesiophilic
seeds in suppressing Mg dendrite growth.
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considered promising alternativesapplied current densityion batteries owingintroducing magnesiophilic siteshigh volumetric capacitymg metal anodemg growth behaviorsmetal dendritic growthinternal short circuitadvancing practical rmbsmetal batteriesshort circuitmg anodesdendrite growthmagnesiophilic seedscapacity utilizationoperando observation techniquesnew strategymorphological evolutionlow costindeed dendritedirectly monitoringdendrite suppressionconventional liau nanoseedsalso demonstrated