Advances in Anion Chemistry in the Electrolyte Design for Better Lithium Batteries.

Xiao, Hecong; Li, Xiang; Fu, Yongzhu

Highlights: The impact of anions on the interface is summarized, including forming a solid electrolyte interphase (SEI), repairing the damaged SEI, and modulate electric double layer. The influence of anions on the solvation structure is presented, including enhancing desolvation process of the Li-ions and the antioxidant property of the electrolyte. This review also emphasizes the important role of anions in enhancing battery safety through their flame-retardant properties, as well as their impact on energy density and power density by altering reaction pathways and accelerating reactions. Electrolytes are crucial components in electrochemical energy storage devices, sparking considerable research interest. However, the significance of anions in the electrolytes is often underestimated. In fact, the anions have significant impacts on the performance and stability of lithium batteries. Therefore, comprehensively understanding anion chemistry in electrolytes is of crucial importance. Herein, in-depth comprehension of anion chemistry and its positive effects on the interface, solvation structure of Li-ions, as well as the electrochemical performance of the batteries have been emphasized and summarized. This review aims to present a full scope of anion chemistry and furnish systematic cognition for the rational design of advanced electrolytes for better lithium batteries with high energy density, lifespan, and safety. Furthermore, insightful analysis and perspectives based on the current research are proposed. We hope that this review sheds light on new perspectives on understanding anion chemistry in electrolytes.

ANIONS; ENERGY density; LITHIUM cells; POWER density; SOLID electrolytes; BATTERY management systems; ELECTROCHEMICAL analysis; ELECTROLYTE analysis

Nano-Micro Letters, 2025, Vol 17, Issue 1, p1

2311-6706

Academic Journal

10.1007/s40820-024-01629-5