Working Principles of Zinc–Sulfur Batteries

This chapter delves into the nuanced charge–discharge behavior of zinc-sulfur (Zn–S) battery systems, focusing on the fundamental electrochemical processes that govern their performance. A detailed exploration of these processes reveals how sulfur consumption and the formation of ZnS occur during discharge, while sulfur regeneration dominates the charging phase. The chapter also examines the challenges faced in cycling behavior, particularly the impact of byproducts such as sulfate ions ( \({\text{SO}}_{4}^{2-}\) ), dendritic formation on the zinc anode, and irreversible side reactions. Thesefactors contribute to the degradation of capacity and efficiency over time. Various strategies, such as incorporating redox mediators and optimizing cathode and electrolyte configurations, have been shown to improve the cycling stability and performance of Zn–S batteries. The chapter underscores the importance of these innovations in overcoming limitations related to energy density, capacity retention, and overall efficiency, setting the stage for future advancements in Zn–S battery technology for sustainable energy storage solutions.