Li3BO3-Li3PO4 Composites for Efficient Buffer Layer of Sulphide-Based All-Solid-State Batteries

All-solid-state batteries (ASSBs) based on sulphide electrolytes are promising next-generation energy storage systems because they expected to have improved safety, increased volumetric density, and a wide operating temperature range. However, side reactions at the cathode/electrolyte interface deteriorate electrochemical performance limit commercialization of ASSBs. Surface coating cathode is an efficient approach for overcoming this issue. In study, new Li3BO3 (LBO)-Li3PO4 (LPO) composites were applied as materials high-Ni cathodes (NCM). PO4-based (such LPO) been used layers their good chemical stability in electrolytes. ionic conductivity LPO slightly insufficient compared those generally ternary oxides. The addition LBO could compensate low may provide better protection against owing effect LBO, which has material. As expected, LBO-LPO (LBPO) NCM exhibited superior discharge capacity, rate capability, cyclic pristine LPO-coated NCMs. X-ray photoelectron spectroscopy (XPS) energy-dispersive (EDS) analyses confirmed that LBPO successfully suppressed byproduct formation undesirable interfacial layer, attributed reactions. This result clearly shows potential excellent buffer layer stabilise oxide cathode/sulphide electrolyte interface.