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Robust ZnS interphase for stable Zn metal anode of high-performance aqueous secondary batteries

International Journal of Minerals,Metallurgy and Materials 2022年第5期29卷 1053-1060页

作者： Lingyun Xiong Hao Fu Weiwei Han Manxiang Wang Jingwei Li Woochul Yang Guicheng Liu Department of Physics Dongguk UniversitySeoul 04620Republic of Korea School of Materials Science and Engineering Hefei University of TechnologyHefei 230009China College of Physics and Electronic Information Yan’an UniversityYan’an 716000China

Although Zn metal is an ideal anode candidate for aqueous batteries owing to its high theoretical capacity,lower cost,and safety,its service life and efficiency are damaged by severe hydrogen evolution reaction,self-corrosion,and dendrite ***,a thickness-controlled ZnS passivation layer was fabricated on the Zn metal surface to obtain Zn@ZnS electrode through oxidation–orientation sulfuration by the liquid-and vapor-phase hydrothermal *** from the chemical inertness of the ZnS interphase,the as-prepared Zn@ZnS electrode presents an excellent anti-corrosion and undesirable hydrogen evolution ***,the thickness-optimized ZnS layer with an unbalanced charge distribution represses dendrite growth by guiding Zn plating/stripping,leading to long service ***,the Zn@Zn S presented 300 cycles in the symmetric cells with a 42 mV overpotential,200 cycles in half cells with a 78 mV overpotential,and superb rate performance in Zn||NH;V;O;full cells.

关键词： Zn metal anode dendrite-free ZnS passivation layer controllable thickness chemical inertness unbalanced charge distribution

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Separator Dependency on Cycling Stability of Lithium Metal Batteries Under Practical Conditions

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Energy & Environmental Materials 2023年第5期6卷 307-316页

作者： Hyeongguk An Youngjoon Roh Youngseong Jo Hyuntae Lee Minhong Lim Mingyu Lee Yong Min Lee Hongkyung Lee Department of Energy Science and Engineering Daegu Gyeongbuk Institute of Science and Technology DGIST333 Techno Jungang-daeroDaegu 42988Korea Energy Science and Engineering Research Center Daegu Gyeongbuk Institute of Science and Technology(DGIST)333 Techno Jungang-daeroDaegu 42988Korea

Development of practical lithium(Li)metal batteries(LMBs)remains challenging despite promises of Li metal anodes(LMAs),owing to Li dendrite formation and highly reactive surface *** separators used in LMBs may undergo severe mechanical and chemical deterioration when contacting with *** identify the best polyolefin separator for LMBs,this study investigated the separator-deterministic cycling stability of LMBs under practical conditions,and redefined the key influencing factors,including pore structure,mechanical stability,and chemical affinity,using 12 different commercial separators,including polyethylene(PE),polypropylene(PP),and coated *** extreme compression triggered by LMA swelling,isotropic stress release by balancing the machine direction and transverse direction tensile strengths was found to be crucial for mitigating cell *** of PP separators,a PE separator that possesses a high elastic modulus and a highly connected pore structure can uniformly regulate LMA *** ceramic coating reinforced short-circuiting resistance,while the cycling efficiency degraded rapidly owing to the detrimental interactions between ceramics and *** study identified the design principle of separators for practical LMBs with respect to mechanical stability and chemical affinity toward LMAs by elucidating the impacts of separator modification on the cycling performance.

关键词： chemical inertness lithium metal batteries mechanical strength polyolefin separators short-circuiting

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