Shot Peening on All-solid-state Lithium Metal Battery for High-speed Charging
Author: M. Kodama1, K. Takashima1 and S. Hirai1 1 School of Engineering, Tokyo Institute of Technology, Japan
Source: ICSP14 Milan
Doc ID: 2022067
Year of Publication: 2022
Abstract:
All-solid-state lithium metal battery is a candidate of the next generation electrical vehicle’s
battery. However, lithium dendrite generated in the fast charging process penetrates the
solid electrolyte layer and breaks the battery with an internal short circuit. With this problem,
the charging speed of the all-solid-state lithium metal battery is limited. In this paper, the
authors propose and demonstrate a shot peening processing on the solid electrolyte layer
surface to increase the charging speed of the all-solid-state lithium metal battery. With the
shot peening, crack generation on the solid electrolyte layer can be suppressed with the
compressive residual stress, and the lithium dendrite penetration into the solid electrolyte
layer should be suppressed. Moreover, the shot peening generates a roughness on the
surface of the solid electrolyte layer, and the contact between the solid electrolyte layer to
the lithium metal anode would be improved, and the electrochemical reaction should be
enhanced. The experimental results show that the shot peening successfully increases the
charging speed (critical current density). Moreover, there is a synergistic effect between shot
peening and gold thin-film insertion, which is one of the electrochemical performance
improvement methods. Shot peening with changing the shot size is also conducted. The
results show that there is an optimum shot size that maximizes the charging speed.
Keywords All-solid-state lithium metal battery, shot peening, charging speed, shot size.
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