Journal
ACS APPLIED ENERGY MATERIALS
Volume 2, Issue 9, Pages 6720-6731Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsaem.9b01193
Keywords
all-solid-state lithium battery; lithium metal anode; garnet-type solid-state electrolyte; cycling stability; acid treatment
Funding
- Japan Society for the Promotion of Science (JSPS) [17H04894]
- Grants-in-Aid for Scientific Research [17H04894] Funding Source: KAKEN
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All-solid-state lithium batteries incorporating oxide-based solid electrolytes have attracted much attention as a promising battery system for enabling highly reversible Li metal anodes. However, the cycling stability of Li plating/stripping reactions at higher charging/discharging rates on garnet-type solid-state electrolytes must be improved to realize a practical Li metal anode for solid-state batteries. Here, we report that a short acid etching procedure performed in ambient air significantly activates the Ta-doped Li7La3Zr2O12 (LLZT) surface compared to polishing under inert gas atmosphere such as dry Ar. It has been believed that Li7La3Zr2O12 (LLZ) and related doped LLZ solid electrolyte surfaces need to be mechanically polished in dry Ar before the cell fabrication to remove Li2CO3 and LiOH that are present on the surface. However, a commonly used mechanical polishing procedure is found to form a thin electrochemically inactive layer on the LLZT surface, whereas a short acid etching procedure (e.g., HCl) removes the inactive layer, and the acid-etched LLZT exhibits excellent cycling stability.
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