Superhalogen-based Li-rich double antiperovskite Li6OS(BH4)2 as solid electrolyte

A perspective on the building blocks of a solid-state battery: from solid electrolytes to quantum power harvesting and storage

“…Furthermore, a symmetric cell was fabricated as Li/Li 6 OS(BH 4 ) 2 /Li; this cell is reported to have a long cycling stability of about 3000 h at 60 mA cm −2 current density, even though the increment of the current density seems to reduce the cycling stability. The crystal structure of Li 6 SO(BH 4 ) has been found to stabilize in the cubic Fm 3m phase 91 which is consistent with the antiperovskite structures of Li 3 O(BH 4 ) and Li 3 S(BH 4 ) but different from that of Li 3 OCl whose cubic crystalline structure belongs to the perovskite conventional Pm 3m space group (Table 1). Moreover, this electrolyte exhibits exceptional mechanical stability, with a bulk modulus of 128.5 GPa.…”

“…Another common structural modication performed on X 3 BA antiperovskite is the formation of double antiperovskites. Islam et al 91 reported the rst synthesis of a super-halogen Lirich double antiperovskite Li 6 OS(BH 4 ) 2 as a solid electrolyte. The synthesis consisted of a 3-step process starting with ball milling and liquid phase processes, followed by heat treatment at 380-400 °C and water removal under high vacuum to promote the creation of the Li 6 OS(BH 4 ) 2 product, Li 2 O + Li 2 S + 2Li(BH 4 ) / Li 6 OS(BH 4 ) 2 .…”

“…The synthesis consisted of a 3-step process starting with ball milling and liquid phase processes, followed by heat treatment at 380-400 °C and water removal under high vacuum to promote the creation of the Li 6 OS(BH 4 ) 2 product, Li 2 O + Li 2 S + 2Li(BH 4 ) / Li 6 OS(BH 4 ) 2 . 91,98 In the study, 91 the band gap of the electrolyte was determined to be 4.03 eV. Furthermore, a symmetric cell was fabricated as Li/Li 6 OS(BH 4 ) 2 /Li; this cell is reported to have a long cycling stability of about 3000 h at 60 mA cm −2 current density, even though the increment of the current density seems to reduce the cycling stability.…”

“…Moreover, the larger radius of halogen anions leads to longer ionic bonds and increased polarizability in the electrolytes, facilitating the migration and plasticity of Li + -ions. 91,105 Most halide electrolytes show a general formula, Li a MHal b , where M = Y, Er, Yb, In,., Hal = F, Cl, Br, and I. In this subsection, the analysis is mainly focused on electrolytes based on chloride ions as the halogen element.…”

“…Moreover, the larger radius of halogen anions leads to longer ionic bonds and increased polarizability in the electrolytes, facilitating the migration and plasticity of Li + -ions. 91,105…”