Lithium-ion-conducting glass-ceramics of a boron-containing alkali sodalite Li<sub>8</sub>B<sub>6</sub>Si<sub>6</sub>O<sub>24</sub>Cl<sub>2</sub>

Alkali sodalites containing boron (B) as the main framework cation are scarce. A cubic lithium sodalite B in framework, Li8B6Si6O24Cl2, whose lattice parameter [7.8856(1) Å] is smallest of known alkali sodalites, has been discovered, and Li8B6Si6O24Cl2-based glass-ceramics have prepared from Li2O–B2O3–SiO2–LiCl quaternary system. The relative density resulting weight fraction Li8B6Si6O24Cl2 their crystalline part reached ∼0.98 ≳0.9, respectively. dc conductivity recorded at 60 °C with non-blocking Li–Au electrodes was ∼1.5 × 10−6 ∼2.3 10−7 S cm−1 partially highly crystallized samples, respectively, activation energy ∼0.5–0.6 eV. were stable contact Li metal transport number Li+ ion ∼0.95.