Solid State Electrolytes: Amorphous Dual‐Layer Coating: Enabling High Li‐Ion Conductivity of Non‐Sintered Garnet‐Type Solid Electrolyte (Adv. Funct. Mater. 15/2021)

In article number 2009692, Yongfeng Liu, Hongge Pan, and co-workers report a LLZTO composite with a unique amorphous dual coating: LiBO2 as the inner layer and LiBH4 as the outer layer. The LiBO2 inner layer prevents further reaction between LiBH4 and LLZTO and stabilizes the LiBH4 outer layer. The LiBH4 outer layer plays a key role in filling the gap while cold pressing the composite into electrolyte pellets, facilitating Li+ ion transfer due to the much enhanced contact.