Lithiated carbon fibres for structural batteries characterised with Auger electron spectroscopy

Structural batteries are multifunctional devices that store energy and carry mechanical load, simultaneously. The pivotal constituent is the carbon fibre, which acts as not only structural reinforcement, but also electrode by reversibly hosting Li ions. Still, little known about how fibres interact. Here we map inserted in polyacrylonitrile based with Auger electron spectroscopy (AES). We show slow charge/discharge rates, distributes uniformly transverse longitudinal direction of when fully discharged, all virtually expelled. With fast tends to be trapped core fibre. In some fibres, plating found between solid electrolyte interphase (SEI) fibre surface. Our findings can guide AES analysis on other carbonaceous materials for Li-ion used improve performance batteries.