异质电解质层中锂枝晶生长行为原位观测分析研究OA

Sulfide solid-state electrolytes are promising candidates for high-specific-energy all-solid-state batteries;however,short circuits caused by lithium dendrite penetration remain a critical barrier to practical application.Previous studies have shown that incorporating a Li10GeP2S12(LGPS)interlayer within Li5.5PS4.5Cl1.5(LPSC)can delay dendrite propagation,but direct experimental clarification of the dynamic process and interfacial regulation mechanism is still insufficient.In this work,a light-transmissive ultrathin LPSC-LGPS bilayer microbattery was constructed to enable synchronous optical-electrochemical tracking of lithium dendrite growth across heterogeneous sulfide interfaces.The results show that lithium dendrites tend to propagate along a single dominant pathway within LPSC.Upon reaching the LPSC-LGPS interface,continuous forward growth is replaced by interfacial stagnation and lateral spreading,accompanied by increasing equivalent pathway resistance.Further investigation reveals that when the leading dendrite front contacts LGPS,the progressive accumulation of high-resistance decomposition products induced by interfacial reactions diverts the current originally concentrated at the dendrite tip.This weakens its kinetic advantage for continued forward growth and promotes current redistribution toward alternative low-resistance pathways under multisite deposition conditions,thereby establishing a passive negative-feedback current redistribution mechanism.This study provides direct in situ observational evidence for the suppression of dendrite penetration by LGPS interlayers and reveals a regulation mechanism that may depend on the synergistic interplay between reaction-induced local resistance buildup and tip current shunting,offering new insights into functional interlayer design and dendrite mitigation strategies for sulfide-based solid-state electrolytes.