Li2(BH4)(NH2) Nanoconfined in SBA-15 as Solid-State Electrolyte for Lithium Batteries

Solid electrolytes with high Li-ion conductivity and electrochemical stability are very important for developing high-performance all-solid-state batteries. In this work, Li-2(BH4)(NH2) is nanoconfined in the mesoporous silica molecule sieve (SBA-15) using a melting-infiltration approach. This electrolyte exhibits excellent Li-ion conduction properties, achieving a Li-ion conductivity of 5.0 x 10(-3) S cm(-1) at 55 degrees C, an electrochemical stability window of 0 to 3.2 V and a Li-ion transference number of 0.97. In addition, this electrolyte can enable the stable cycling of Li|Li-2(BH4)(NH2)@SBA-15|TiS2 cells, which exhibit a reversible specific capacity of 150 mAh g(-1) with a Coulombic efficiency of 96% after 55 cycles.

Automated summary

The study reports the preparation of solid electrolytes with high Li-ion conductivity by nanoconfining Li-2(BH4)(NH2) in mesoporous silica molecular sieves using a melting-infiltration approach. The solid electrolyte exhibits excellent electrochemical stability, Li-ion conductivity, and cycling performance in Li|Li-2(BH4)(NH2)@SBA-15|TiS2 cells.