Interplay of Interfacial Adhesion and Mechanical Degradation in Anode-Free Solid-State Batteries
Year: 2024
Type: article
Abstract: Anode-free solid-state batteries (AFSSBs) with an AgC interlayer are innovative architecture for their high energy density compared to conventional Li metal solid-state batteries. This work introduces simple methods to enhance the interfacial adhesion strength between the AgC interlayer and the solid electrolyte (SE) for better initial capacity of the full cells, through the control of the cell assembling pressure to put together all components of the cell. Through contact angle experiments, the study unveils how the change in assembling pressure can significantly alter the contact angle between the SE and Li metal, and hence the adhesion energy between them. Our electrochemical tests evidence that raising the assembling pressure from 350MPa to 530MPa results in an initial capacity increase of more than 50% due to the higher adhesion energy, with the corresponding energy density of 410 Wh/kg. However, SE crack beyond the critical assembling pressure of 530MPa would cause a dramatic decrease of the cell performance. The work concludes by affirming the vital role of the interfacial adhesion between the AgC interlayer and the SE in AFSSBs. Therefore, appropriately increasing the interfacial adhesion through different fabrication methods, such as pressing the contacting interface with uni-axial or isostatic pressure, can prevent interface degradation and increase the energy density of next-generation solid-state batteries.
Language: English
Subfield: Electrical and Electronic Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W4402589978