Mixed ionic and electronic conducting binders containing PEDOT:PSS and organic ionic plastic crystals toward carbon-free solid-state battery cathodes

Abstract

The performance of next generation solid-state lithium metal batteries (LMB) is intimately related to the ionic-electronic interconnection within the cathode material. In batteries containing liquid electrolytes, the soaking of electrolyte...

Thermal, structural and dynamic properties of ionic liquids and organic ionic plastic crystals with a small ether-functionalised cation

“…These systems expand the library of potential solid-state and liquid electrolytes, not only for alkali metal battery applications but also in applications such as CO 2 capture, 112 gas separation, 113,114 solid-state supercapacitors 115 and as potential binders in electrode materials. 116,117…”

Recent achievements of free‐standing material and interface optimization in high‐energy‐density flexible lithium batteries

“…[ 55 ] Based on PEDOT:PSS and organic ionic plastic crystals, Casado's group has created a series of carbon‐free solid‐state battery cathodes with good mechanical properties and electron/ion transport dynamics. [ 52 ] As shown in Figure 3e,f, solid‐state LiFePO 4 ||Li cell with carbon‐free cathodes reveals superior capacity retention of 99.7% (145.2 mAh g −1 ) after 500 cycles. Therefore, developing polymer binders possessing specific functional groups to enhance the contact between conductive additives and active nanoparticles through strong bond cooperation is an effective strategy, which can optimize the ion and electron conductivity along the interface so as to further avert the electrical contact loss originated by the large volumetric expansion during cycling.…”

What Can We Learn about PEDOT:PSS Morphology from Molecular Dynamics Simulations of Ionic Diffusion?

“…In many of the abovementioned applications, the device’s performance relies on the efficiency of the ion transport; therefore, during the past decade, the investigation of various aspects of ion transport in PEDOT:PSS has attracted great attention. In most of the reported studies, researchers mostly focused on the ionic conductivity σ (usually using impedance measurements), − whereas studies addressing the ion mobility μ (or the diffusion coefficient, D = μ k B T / q ) are rather scarce. − (Note that determination of the mobility from the measured conductivity is typically not viable because the conductivity is the product of the ion charge, mobility, and concentration, σ = q μ n , and the independent determination of the concentration of the ions contributing to the conductivity represents a significant challenge.) Direct measurement of the ion mobility in PEDOT:PSS was reported in the pioneering works of Malliaras and collaborators , who used the moving front experiments to monitor the electrochromic changes associated with the propagation of the dedoping front in the film.…”