Fluorine Chemistry for Negative Electrode in Sodium and Lithium Ion Batteries

Fluorine chemistry plays an important role in the development of materials for lithium-ion batteries. Throughout this chapter, we shed light on fluorine chemistry for sodium-ion batteries, especially carbonaceous materials and sodium alloy/compounds as negative electrode materials. These electrode materials have different reaction mechanisms for electrochemical sodiation/desodiation processes. Moreover, not only sodiation-active materials but also binders, electrolytes, electrode/electrolyte interphase, and its stabilization are essential for long cycle life. Electrochemical formation of lithium silicide is also described. Indeed, fluorinated ethylene carbonate is an effective electrolyte additive. This chapter also addresses the corrosion of the aluminum current collector at high potential, depending on the nature on the electrolyte and fluorinated anions salts.