Stabilization of fast lithium-ionic conduction phase of nanaoconfined LiBH4 for lithium metal solid-state batteries

Abstract

The nanoconfinement of LiBH₄ into mesoporous Al₂O₃ as a fast lithium-ion conductor is presented, and its high-temperature phase is retained at near-room temperature. It exhibits an excellent electrochemical stability and Li⁺ conductivity of 3.2 × 10⁻⁴ S cm⁻¹ at 75 °C, which represents an increase of nearly three orders of magnitude compared to the pristine one.