Publication date: 10th April 2024
Lithium metal is expected to be a promising negative electrode material because of its low potential of -3.04 V (vs. SHE) and large theoretical capacity of 3860 mAh g-1, and Li metal batteries have been investigated even in all-solid-state batteries with sulfide solid electrolytes (SSE). It has been reported that the insertion of an interface layer such as an Au thin film between Li and SSE improves the Li stripping/plating properties [1]. We evaluated Li|Au|SSE|Li4Ti5O12 cells and found that a short circuit occurred when the cell was repeatedly charged and discharged at a low stack pressure of ~1 MPa. Analysis of the cells after cycling indicated that the short circuit was attributed to the durability and Li plating characteristics of the Au interface layer. In this study, a carbon layer was added to improve the properties of the interface layer and the electrochemical performance of the all-solid-state Li metal cells was investigated.
A self-supported carbon paper was used to easily add a carbon layer between Li and SSE. The C/Au film was prepared by Au sputtering on one side of the carbon paper. An all-solid-state Li|C/Au|SSE|Li4Ti5O12 cell was fabricated by using the self-supported C/Au film and the cell performance was examined. The cell with Au layer exhibited short-circuit behavior by 20 cycles, while the cell with C/Au layer worked without short-circuit up to 100th cycle.
This work was supported by JST ALCA-SPRING Grant Number JPMJAL1301 and GteX Program Grant Number JPMJGX23S5, Japan. This work was also supported by MEXT Promotion of Distinctive Joint Usage/Research Center Support Program Grant Number JPMXP0723833161 for Collaborative Research Project of All-Solid-State Batteries in Osaka Metropolitan University.
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