Dynamic Ionic Transport Actuated by Nanospinbar-Dispersed Colloidal Electrolytes Toward Dendrite-Free Electrodeposition

Minhong Lim; Suhwan Kim; Junsik KangDahee JinHyeongguk AnHyuntae LeeJoonam ParkMingyu LeeJiyeon SeoHochun LeeYong Min LeeHongkyung Lee

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Dynamic Ionic Transport Actuated by Nanospinbar-Dispersed Colloidal Electrolytes Toward Dendrite-Free Electrodeposition

机译：Dynamic Ionic Transport Actuated by Nanospinbar-Dispersed Colloidal Electrolytes Toward Dendrite-Free Electrodeposition

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Inhibiting uneven dendritic Li electroplating is crucial for the safe and stablecycling of Li metal batteries (LMBs). Homogeneous and fast Li~+ transporttowards the Li surface is required for uniform and dendrite-free deposition.However, the traditional ionic transport of static liquid electrolytes involvingelectromigration and molecular diffusion can trigger a greater disparity inthe Li concentration over the Li surface, leading to irregular dendrite growth.Here, a convective Li~+ transfer for suppressing dendrite growth throughmagnetic nanospinbar (NSB)-dispersed colloidal electrolytes is presented.An ultrahigh-aspect-ratio NSB consisting of a paramagnetic Fe_3O_4 nanoparticlearray and silica outer coating is synthesized. Manipulating the externalelectromagnetic force can remotely control the rotation of individual NSBswithout dispersion failure, thereby generating mesoscale turbulence insidethe cells. Regardless of the electrolyte composition, rotating the NSB canreduce the Li~+ diffusion layer thickness from the bulk and evenly redistributethe Li~+ flux over the Li surface, thereby suppressing Li dendrite growth. TheNSB-dispersed electrolyte with advanced salt/solvent compositions demonstratesstable cycling of LMBs over 600 cycles with 70 capacity retention,thereby outperforming the NSB-free cell.

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来源
《Advanced functional materials》 |2022年第40期|2204052.1-2204052.12|共12页
作者
Minhong Lim; Suhwan Kim; Junsik KangDahee JinHyeongguk AnHyuntae LeeJoonam ParkMingyu LeeJiyeon SeoHochun LeeYong Min LeeHongkyung Lee;
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作者单位

Department of Energy Science & EngineeringDaegu Gyeongbuk Institute of Science and Technology (DGIST)333 Techno Jungang-daero, Hyeonpung-Eup, Dalseong-gunDaegu 42988, Republic of Korea;

Energy Science and Engineering Research CenterDaegu Gyeongbuk Institute of Science and Technology (DGIST)333 Techno Jungang-daero, Hyeonpung-eup, Dalseong-gunDaegu 42988, Republic of Korea;

Department of Energy Science & EngineeringDaegu Gyeongbuk Institute of Science and Technology (DGIST)333 Techno Jungang-daero, Hyeonpung-Eup, Dalseong-gunDaegu 42988, Republic of Korea Energy Science and Engineering Research CenterDaegu Gyeongbuk Institut;

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正文语种英语
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colloidal electrolytes; ionic transport; lithium metal batteries; mesoscale turbulence; nanospinbars;

Dynamic Ionic Transport Actuated by Nanospinbar-Dispersed Colloidal Electrolytes Toward Dendrite-Free Electrodeposition

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