The present invention relates to a material comprising a garnet-type oxide in the form of a powder comprising a plurality of sheet structures, a hybrid quasi-solid electrolyte framework comprising the material, a hybrid quasi-solid electrolyte comprising the hybrid quasi-solid electrolyte framework, and an electrochemical cell comprising the hybrid quasi-solid electrolyte. The present invention also relates to the respective methods for preparing the material, hybrid quasi-solid electrolyte framework, hybrid quasi-solid electrolyte and electrochemical cell. The present invention also relates to the respective methods for preparing the material, hybrid quasi-solid electrolyte framework, hybrid quasi-solid electrolyte and electrochemical cell as described above.