Encapsulated Monoclinic Sulfur for Stable Cycling of Li–S Rechargeable Batteries

Abstract

Monoclinic S₈, an uncommon allotrope of sulfur at room temperature, can be formed when common orthorhombic S₈ is heat‐treated under enclosed environments in nanometer dimensions. Monoclinic S₈ prevents the formation of soluble polysulfides during battery operation, resulting in unprecedented cycling performance over 1000 cycles under the highest sulfur content to date.