Novel Solid Polymer Electrolytes with Single Lithium-Ion Transport

Abstract

State-of-the-art poly͑ethylene oxide͒ ͑PEO͒-based polymer electrolytes have a t Liϩ much lower than 1; it is typically around 0.2-0.3. Thus, the development of single-cation-conductive, solvent-free polymer electrolytes is considered of prime importance for the progress of the technology of lithium batteries. Attempts mainly directed at immobilization of the anion in the polymer architecture have been reported in the past, but with only modest success because this approach generally depresses the conductivity to unacceptably low values. In this work, we report an alternative, new approach based on the addition to the PEO-LiX blend of an anion-trapping supermolecular component. In this way, polymer electrolytes with unity values of t Liϩ but still maintaining a true solid configuration combined with appreciable conductivity have been obtained. To our knowledge, this strategy has never been used, and we believe that this breakthrough result is associated with the immobilization of the anion (X Ϫ ) by the additive and, possibly, by an ordering of the PEO-LiX system.

Salt-in-Polymer Electrolytes for Lithium Ion Batteries Based on Organo-Functionalized Polyphosphazenes and Polysiloxanes

“…Interestingly, an increase of the transference number of lithium ions has been achieved by dispersing nanoparticles, or by dissolving crown ethers or other molecules with specific ionic interactions [48,87,88]. A completely different approach was suggested and investigated by Bruce et al which relies on ordered domains of PEO based electrolytes with fast transport of lithium ions along helix channels formed by the PEO backbone [89,90].…”

A New Class of P(VdF-HFP)-CeO2-LiClO4-Based Composite Microporous Membrane Electrolytes for Li-Ion Batteries

“…High energy density rechargeable lithium batteries are important to the development of several applications such as portable electronic devices; electric or hybrid cars still requires the optimization of some critical operational features with special concern directed toward those related to safety and design flexibility [1]. Conventional lithium batteries, liquid electrolyte make batteries unsafe due to electrolyte leakage and electrochemical instability due to the repeated oxidation/restoration reaction at the interface between the electrode and electrolyte [2].…”

Influence of calix[2]‐p‐benzo[4]pyrrole on the electrochemical properties of poly(ethylene oxide)‐based electrolytes for lithium batteries

“…Also of importance is the fact that the mobile anions involve in unwanted electrode reactions and reduce the active area of the electrode. Blazejczyk et al 8 achieved a lithium-ion transport number equal to 1 with an appreciable conductivity and suggested that an anion-trapping mechanism was induced by the calixarene additive. Blazejczyk et al 9 [4]pyrrole (p-6) containing two dipyrro-methane moieties and two p-phenylene units was synthesized as described earlier.…”