All-Solid-State Batteries with Pre-plated Ultrathin Lithium Metal Enabled by No Pressure Holding and Characterized by In Situ Electron Paramagnetic Resonance Imaging

摘要

All-solid-state batteries with ultrathinlithium metal,close tothe anode-free solid-state batteries, could achieve high energy density.However, it is not trivial to plate an ultrathin lithium metal layeron a Cu current collector (Cu-CC). In situ electronparamagnetic resonance (EPR) imaging showed that the pre-plating onCu-CC in a Li-In|Li6PS5Cl|Cu cell withoutpressure holding produced a lithium metal layer with a small area.However, when a Li-In|Li6PS5Cl|Cu cellwas held under a considerable pressure, this cell would produce alithium metal layer with a large area. The Cu-CC with the ultrathinlithium metal layer of a small surface could be extracted and thenassembled with LiNiO2 and Li(6)PS(5)Clto achieve better electrochemical performance compared to that ofa large surface, because a small area of the lithium metal layer wouldlead to fewer side reactions and less consumption of lithium ions.This work suggests the importance of the control of the lithium platingand the observation of lithium plating by in situ EPR imaging.

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