Zineb Edfouf

Presentation Inorganic Phosphites as a New Frontier for Multifunctional Electrodes in Lithium- and Sodium-Based Batteries

The urgent demand for safer and higher-performance energy storage systems calls for the exploration of unconventional electrode chemistries beyond established materials. In this context, inorganic phosphites, pioneered and actively developed by the MANAPSE research team, emerge as a highly promising yet still underexplored class of compounds for lithium-based batteries. Here, we present a comprehensive investigation of phosphite-based materials, including SnHPO3, LiTi(HPO3)2, and Ti2(HPO3)3, [1-3] highlighting their unique structural versatility and tunable electrochemical behavior. Through a combination of rational synthesis strategies and advanced structural and morphological engineering, we demonstrate how these materials can be precisely tailored to enhance lithium storage performance, improve rate capability, and achieve remarkable cycling stability. Particular emphasis is placed on understanding lithium reactivity mechanisms. By employing complementary in situ and ex situ spectroscopic techniques, we provide new insights into the dynamic processes governing lithium insertion and conversion reactions. These results reveal the intrinsic adaptability of phosphite frameworks, which enables efficient lithium accommodation through complex yet highly reversible pathways, while maintaining structural integrity upon cycling. In addition to their relevance as anode materials, LiTi(HPO3)2 is further explored as a cathode candidate and exhibits outstanding electrochemical stability, highlighting the multifunctional character of phosphite compounds. This work positions inorganic phosphites as a new frontier in battery materials research. It establishes a strong foundation for the rational design of next-generation electrode materials and opens promising avenues toward safer, more efficient, and sustainable lithium-based energy storage technologies.