Vers des batteries lithium organiques innovantes mettant en jeu des polymères à base de Nméthylphénothiazines modifiées

摘要

The N-methylphenothiazine (MPT) is a prime target with the aim of developing innovative redox organic materials useful as positive electrode of lithium-ion battery. These organic materials are today a credible alternative to inorganic materials by their lower cost and toxicity.It is in this context that MPT-based redox polymers have been synthesized and characterized. Their electrochemical properties have been investigated in lithium cells to estimate their potential.But why the N-methylphenothiazine ? This redox target has two reversible systems but only the first is exploited. The project was therefore the chemical modification of the MPT molecule to modulate potential values of two systems. These chemical developments thus allow improving notably the MPT derivative theoretical capacities accessible in the electrochemical stability range of lithium-ion technology electrolyte.These derivatives were synthesized and tested in lithium cell. Some of them present interesting performances. But despite the use of insoluble materials at the neutral state, cell tests showed material dissolution in the oxidized state, which decreases significantly the obtained capacities.