Tailoring the Salt Concentration in a Gel‐Solid Polymer Electrolyte to Stabilize High‐Voltage LiCoMnO4 Cathode

Abstract Here, an attempt is made to depict the role of salt concentration on the electrochemical stability of a gel interface formed by the in‐situ polymerization of a commercial liquid electrolyte on solid‐polymer support, which is the so‐called gel‐solid polymer electrolyte (G‐SPE). The electrochemical characterization of the electrolyte exhibits high ionic conductivity in the order of ≈10 −3 S cm −1 at ambient temperature, while the same increases as the LiPF 6 concentration varies from 1 to 3 m . Further, the flammability test has shown the flame‐retardant nature of the G‐SPE compared to the liquid electrolyte. The stability of the G‐SPE is analyzed in a half‐cell configuration with a high‐voltage LiCoMnO 4 cathode. Also, anode and anode‐less cell configurations with LiCoMnO 4 cathode against Li 4 Ti 5 O 12 and Cu are carried out with G‐SPE‐2 m as the electrolyte. In addition, post‐mortem analysis, like XRD, XPS, EDS, SEM, etc., of the cycled LiCoMnO 4 electrode and G‐SPE is carried out to understand the occurrence of any material degradation or electrolyte decomposition during cycling.