Siwon Kim, Hong Rim Shin, Ki Jae Kim, Min-Sik Park, Jong-Won Lee
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引用次数: 0
Abstract
The application of Li metal anodes in rechargeable batteries is impeded by safety issues arising from the severe volume changes and formation of dendritic Li deposits. Three-dimensional hollow carbon is receiving increasing attention as a host material capable of accommodating Li metal inside its cavity; however, uncontrollable and nonuniform deposition of Li remains a challenge. In this study, we synthesize metal–organic framework-derived carbon microcapsules with heteroatom clusters (Zn and Ag) on the capsule walls and it is demonstrated that Ag-assisted nucleation of Li metal alters the outward-to-inward growth in the microcapsule host. Zn-incorporated microcapsules are prepared via chemical etching of zeolitic imidazole framework-8 polyhedra and are subsequently decorated with Ag by a galvanic displacement reaction between Ag+ and metallic Zn. Galvanically introduced Ag significantly reduces the energy barrier and increases the reaction rate for Li nucleation in the microcapsule host upon Li plating. Through combined electrochemical, microstructural, and computational studies, we verify the beneficial role of Ag-assisted Li nucleation in facilitating inward growth inside the cavity of the microcapsule host and, in turn, enhancing electrochemical performance. This study provides new insights into the design of reversible host materials for practical Li metal batteries.
锂金属阳极在充电电池中的应用因其严重的体积变化和树枝状锂沉积物的形成所带来的安全问题而受到阻碍。三维空心碳作为一种能够在其空腔内容纳金属锂的宿主材料正受到越来越多的关注;然而,锂的不可控和不均匀沉积仍然是一个挑战。在本研究中,我们合成了金属有机框架衍生碳微胶囊,并在囊壁上添加了杂原子簇(锌和银),结果表明,银辅助的锂金属成核改变了微胶囊宿主中由外向内的生长过程。掺杂锌的微胶囊是通过化学蚀刻沸石咪唑框架-8 多面体制备的,随后通过 Ag+ 与金属锌之间的电化学置换反应用 Ag 进行装饰。电镀引入的 Ag 大大降低了锂在微胶囊宿主中成核的能障,并提高了锂镀层的反应速率。通过结合电化学、微结构和计算研究,我们验证了 Ag 辅助锂成核在促进微胶囊宿主空腔内向内生长,进而提高电化学性能方面的有利作用。这项研究为设计实用锂金属电池的可逆宿主材料提供了新的见解。
期刊介绍:
Carbon Energy is an international journal that focuses on cutting-edge energy technology involving carbon utilization and carbon emission control. It provides a platform for researchers to communicate their findings and critical opinions and aims to bring together the communities of advanced material and energy. The journal covers a broad range of energy technologies, including energy storage, photocatalysis, electrocatalysis, photoelectrocatalysis, and thermocatalysis. It covers all forms of energy, from conventional electric and thermal energy to those that catalyze chemical and biological transformations. Additionally, Carbon Energy promotes new technologies for controlling carbon emissions and the green production of carbon materials. The journal welcomes innovative interdisciplinary research with wide impact. It is indexed in various databases, including Advanced Technologies & Aerospace Collection/Database, Biological Science Collection/Database, CAS, DOAJ, Environmental Science Collection/Database, Web of Science and Technology Collection.