Advancements in Anti-Fluorite Cathode Prelithiation Materials for Lithium-Ion Batteries: Fundamental Research and Practical Application.

Integrating cathode prelithiation materials during the electrode fabrication is a safe, convenient, and effective strategy to address the active lithium loss due to the formation of a solid electrolyte interphase layer in lithium-ion batteries (LIBs). It is demonstrated to enhance the energy density and lifespan of LIBs. Various cathode prelithiation materials are available, among which those with anti-fluorite structure have attracted considerable attention due to high lithium inventory, adjustable delithiation potential, and alluring irreversible specific capacity (>500 mAh g-1). In this review, a concise introduction of the crystal structure and atomic coordination of the anti-fluorite prelithiation materials is provided. The phase transition and charge compensation mechanism during delithiation are investigated. Furthermore, the challenges and improvement strategies for each material are systematically summarized and analyzed to provide insights for further commercialization. Finally, reported anti-fluorite prelithiation materials are evaluated from a practical point of view, and insights are offered regarding the future directions for the development of anti-fluorite materials.