Abstract
All-solid-state batteries (SSBs) using lithium metal anode are expected to realize SSBs with high energy density. This is because lithium metal anode has the lowest redox potential and the theoretical capacity of 3861 mA h g-1 is ca. ten times larger than that of commonly-used graphite anode (372 mA h g-1). In fact, lithium metal anode has been successfully used in thin-film-type SSBs and stable charge-discharge reactions are reported [1]. In SSBs, both positive and negative electrode materials are combined with solid electrolytes, and they are assembled from the initial state in general. On the other hand, conventional SSBs apply lithium transition metal oxides (LiCoO2, etc.) as the positive electrode material, and lithium metal is electrochemically plated during the charging process. Appling electrochemically-plated lithium as a anode material can simplify the battery manufacturing process and will be an effective way to form pure lithium metal anode. Such “Li-free” SSBs has been successfully prepared in thin-film-type SSBs [2]. Also, this anode-less idea has been applied to develop large-sized SSBs in recent years [3].In this presentation, the author will talk about the factors for lithium plating morphology on inorganic solid electrolytes, such as current collector species, current densities, temperature, etc. [4]. The model solid electrolytes are LiPON-coated LATP or garnet-structured Ta-doped LLZ. Also, several problems for applying electrochemically-plated lithium anode and the issues arising during the stripping processes will be discussed.
Published Version
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