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Published on: January 20, 2023
Unraveling stepwise pressure effects on interfacial structure and electrochemical dynamics in sulfide-based
Changyu Yan1, Miao Xu2, Xiaomin Li3
1Shanghai Electrochemical Energy Devices Research Center, School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, Shanghai 200240, PR China.
None:
The multi-step pressing processes greatly affect the performances of all-solid-state lithium batteries (ASSLBs). However, the individual and synergistic impact of these processes on interface structure and transport dynamics for energy/mass remains unclear. In this work, before analyzing the stack pressure, fabrication pressure during assembling sulfide-based ASSLBs was deconstructed into two steps: pre-compaction pressure of electrolyte, and final-compaction pressure of electrode and electrolyte. Through a combination of chemical/electrochemical characterizations and multiphsics simulation, the effects and the physical model of stepwise pressures on the interfacial structure are systematically investigated. Under the optimized fabrication parameters of 375 MPa pre-compaction pressure and 625 MPa final-compaction pressure, mechanical interlocking structure between layers is constructed and ensures a densified contact of particles inside the cell. The assembled ASSLBs, operated under stack pressure of 125 MPa, exhibit outstanding performances with a consistency of metrics exceeding 97%, which is also applicable to various kind of sulfide solid-state electrolytes (SSEs). This systematic study on the assembly strategy analyzed the impact of each step on battery performances, thereby providing a reliable foundation for future research on SSEs and the corresponding cell evaluation.
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