As an alternative strategy to form a stable interface, Han and coworkers utilized the Li2CO3 layer on LLZO by forming a highly conductive Li2CO3-Li3BO3 glass-ceramic buffer layer to reduce the interface resistance between LLZO and LiCoO2. The full cell was capable of delivering a discharge capacity of 120 mAh g−1 at 100 °C and a long cycling life of over 100 cycle at room temperature [31].