Multiscale Characterization By Dielectric Spectroscopy of Ionic and Electronic Transfers in Composite Electrodes for Lithium Batteries

摘要

Determine electron and ion transfers in composite porous electrodes is essential to improve their electrochemical performance. When mounting the battery, the composite electrode is soaked with a liquid electrolyte (EL) that completely fills its pores. An electrode has a double hierarchical structure: the first consists of agg lomerates (secondary particles) of AM (primary) particles and the second of agglomerates of carbon black/binder (CB-B) mixture. From the nanometric level to the macroscopic level, this double structure leads to numerous interfaces: AM/AM, CB/CB, CB/AM, EL/AM, EL/CB, electrode/current collector.