Electrochemical stability of ether based salt-in-polymer based electrolytes: Computational investigation of the effect of substitution and the type of salt

Unraveling the Voltage‐Dependent Oxidation Mechanisms of Poly(Ethylene Oxide)‐Based Solid Electrolytes for Solid‐State Batteries

“…A solution to mitigate this problem is to maximize the electrode surface area. [14][15][16][17] Aside of density functional theory (DFT) calculations, [18][19][20] a few attempts have been made in literature to determine the electrochemical stability of electrolytes by other methods than LSV and CV. Those include electrochemical impedance spectroscopy (EIS) [21,22] and reverse linear sweep voltammetry.…”

Electrochemical Compatibility of Solid‐State Electrolytes with Cathodes and Anodes for All‐Solid‐State Lithium Batteries: A Review

“…[190,192] 13b), [172] which was supported by another report. [193] On the other hand, as the "voltage noises" only occurred during the charge process, the phenomenon is also partly due to penetration of lithium dendrites during delithiation of the cathode. A recent work by Homann et al suggested that replacing the linear structure of PEO with a semi-interpenetrating network could enable PEO-based SPEs to resist oxidation up to 4.6 V. [192] To enhance the SPE/cathode stability, one of the most facile ways is to fabricate a stable CEI layer, where choosing suitable lithium salts is important.…”

“…Surface coating of inactive materials such as lithiated Nafion, Al 2 O 3 , and LAGP on cathodes can suppress their catalytic property toward electrolyte decomposition. [193,198,199] Redesigning the composition and structure of the polymer host can enhance the oxidation resistance and mechanical strength of SPEs. As shown in Figure 13d, cross-linking can elevate the mechanical strength of polymers, although it also restricts the movement of polymer chains, sacrifices ionic conductivity, and leads to inferior interfacial contact.…”

Hybrid Solid Polymer Electrolytes with Two‐Dimensional Inorganic Nanofillers

“…VTF is closely relatedt ot he free volume model where there is ad istribution of voids through the polymer matrix broughta bout by polymer motion. The electrochemical window largely depends on the conductive salt used for the nanocomposite and density functional theory calculations performed by Pandiana nd colleagues [60] with PEO/Li-salt composites determined that the cathodica nd anodic limits were determined by the anion and monomer repeat units, respectively.S ubstitution of ethylene chainsw ith fluorine atoms resulted to an extended potential window and correlating to the satisfactory experimental results of Devauxa nd group, [61] development of perfluorinated SPEs may be the next step in the field of solid-statee lectrolytes. Use of this model to fit experimental data is only valid when there is only as ingle existingp hase and provided that the polymer is amorphous.…”

“…The output is an I–V graph (Figure D) wherein a sudden ramp in current indicates oxidation of the anion and the onset voltage corresponds to the degradation potential of the electrolyte. The electrochemical window largely depends on the conductive salt used for the nanocomposite and density functional theory calculations performed by Pandian and colleagues with PEO/Li‐salt composites determined that the cathodic and anodic limits were determined by the anion and monomer repeat units, respectively. Substitution of ethylene chains with fluorine atoms resulted to an extended potential window and correlating to the satisfactory experimental results of Devaux and group, development of perfluorinated SPEs may be the next step in the field of solid‐state electrolytes.…”