Frontispiece: Utilizing the Mn(II) Dissolution-Induced Vacancy for Optimum Mg²⁺ Storage of Spinel Mn₃O₄

The dissolution of Mn(II) at the tetrahedral sites in spinel Mn₃O₄ can induce a morphological transformation (like slicing bread with a knife) and the formation of vacancies, enabling high capacity and fast reaction kinetics of magnesium ion batteries (to be delicious when the jam is spread), as demonstrated by Wei Zhang and co-workers in their Research Article (e202503535).