(Invited) A Versatile Approach for Pre-Lithiation of LIC and Increase of Their Energy Density Via Pyrene Chemistry

Abstract

Double-layer capacitors (EDLC) [1-2] show superior power density, excellent shelf life, high coulombic efficiency, which make them ideal candidates for high-power applications. However, their use remains hindered because of their relatively low energy density in comparison to batteries. Molecular redox grafting[3,4] is one of the two main strategies being currently considered to enable higher energy performance, the other one consisting in tailoring micropore size[5]. The first part of this talk will show based on Raman and XPS analysis as well as theoretical calculations (DFT), that appropriate coupling of pyrene derivatives and carbons allows to increase significantly both the storage capability and average potential of the positive electrode while keeping outstanding retention of both the initial capacity for more than 4000 cycles, and the power characteristics of full cells [6]. The second part of this presentation will show how this pyrene chemistry can advantageously be used to enable a novel and industry relevant-approach for pre-lithiation of lithium-ion capacitors (LIC) full cells [7]. Interestingly, the versatility of this approach makes it of interest not only of Li-ion but also Na-ion batteries.