Investigation of Li-ion transport in Li7P3S11 and solid-state lithium batteries

摘要: Abstract The high Li-ion conductivity of the Li7P3S11 sulfide-based solid electrolyte makes it a promising candidate for all-solid-state lithium batteries. transport over electrode-electrolyte and electrolyte-electrolyte interfaces, vital performance solid-state batteries, is investigated by impedance spectroscopy NMR experiments. An battery assembled with electrolyte, nano-Li2S cathode Li-In foil anode, showing relatively large initial discharge capacity 1139.5 mAh/g at current density 0.064 mA/cm2 retaining 850.0 mAh/g after 30 cycles. Electrochemical suggests that decrease in cycling due to increased interfacial resistance between electrode electrolyte. 1D exchange 7Li quantifies uncycled resulting diffusion coefficient 1.70(3)×10−14  cm2/s 333 K an energy barrier 0.132 eV Li2S This indicates interface small. However, small these contact interfaces are scarce, challenging