biostudies-literatureEl-Shinawi HAcademy of Scientific Research and Technology7557-7563https://www.ebi.ac.uk/biostudies/studies/S-EPMC10910459biostudies-literatureUnknown14(11)All-solid-state batteries present promising high-energy-density alternatives to conventional Li-ion chemistries, and Li-stuffed garnets based on Li₇La₃Zr₂O₁₂ (LLZO) remain a forerunner for candidate solid-electrolytes. One route to access fast-ion conduction in LLZO phases is to stabilize the cubic LLZO phase by doping on the Li sites with aliovalent ions such as Al³⁺ or Ga³⁺. Despite prior attempts, the stabilization of the cubic phase of isostructural Li₇La₃Sn₂O₁₂ (LLSO) by doping on the Li sites has up to now not been realised. Here, we report a novel cubic fast-ion conducting Li₇La₃Sn₂O₁₂-type phase stabilized by doping Ga³⁺ in place of Li. 0.3 mole of gallium per formula unit of LLSO were needed to fully stabilize the cubic garnet, allowing structural and electrochemical characterizations of the new material. A modified sol-gel synthesis approach is introduced in this study to realise Ga-doping in LLSO, which offers a viable route to preparing new Sn-based candidate solid-electrolytes for all-solid-state battery applications.RSC advancesStabilization of the cubic, fast-ion conducting phase of Li₇La₃Sn₂O₁₂ garnet by gallium doping.PMC10910459RESPECT-10025Cussen EJEl-Dafrawy SMEl-Shinawi HMolouk AFSCussen SATarek MfalseStabilization of the cubic, fast-ion conducting phase of Li₇La₃Sn₂O₁₂ garnet by gallium doping.All-solid-state batteries present promising high-energy-density alternatives to conventional Li-ion chemistries, and Li-stuffed garnets based on Li₇La₃Zr₂O₁₂ (LLZO) remain a forerunner for candidate solid-electrolytes. One route to access fast-ion conduction in LLZO phases is to stabilize the cubic LLZO phase by doping on the Li sites with aliovalent ions such as Al³⁺ or Ga³⁺. Despite prior attempts, the stabilization of the cubic phase of isostructural Li₇La₃Sn₂O₁₂ (LLSO) by doping on the Li sites has up to now not been realised. Here, we report a novel cubic fast-ion conducting Li₇La₃Sn₂O₁₂-type phase stabilized by doping Ga³⁺ in place of Li. 0.3 mole of gallium per formula unit of LLSO were needed to fully stabilize the cubic garnet, allowing structural and electrochemical characterizations of the new material. A modified sol-gel synthesis approach is introduced in this study to realise Ga-doping in LLSO, which offers a viable route to preparing new Sn-based candidate solid-electrolytes for all-solid-state battery applications.2024-01-01T00:00:00Z2024 Feb2025-04-26T22:32:23.274Z2025-04-06T17:17:14.897ZS-EPMC109104593844027710.1039/d3ra08968a