All-solid-state Li battery with atomically intimate electrode-electrolyte contact

Creating epitaxial interfaces has recently been discovered as an effective strategy for addressing the electrode-electrolyte contact issue in all-solid-state Li batteries. The solid-solid composite electrode fabricated using this approach not only exhibits atomically intimate solid-solid contact but also possesses excellent tolerance to repeated cycling. Nevertheless, so far such epitaxial composite electrodes have only been cycled in cells with liquid-electrolyte-soaked separators, instead of all-solid-state cells, because realizing a thorough contact between the epitaxial composite electrode and the solid-electrolyte separator layer is difficult. Here, an all-solid-state cell with decent cycling performance was constructed using the epitaxial composite electrode. By infiltrating the Li4Ti5O12-Li0.33La0.56TiO3 ceramic pellet with a poly(ethylene oxide)-based solid electrolyte, a flat, non-porous surface that can effectively contact the separator layer is created. When integrated into an all-solid-state Li4Ti5O12-Li0.33La0.56TiO3 | Li6PS5Cl | Li13Si4 cell, this composite electrode was stably cycled for 100 cycles under 0.1 C at 80 ? with a final discharge capacity of 174.5 mAh g(-1). Published under an exclusive license by AIP Publishing.