A propanesultone-based polymer electrolyte for high-energy solid-state lithium batteries with lithium-rich layered oxides

Polymer electrolyte-based solid-state lithium batteries (SSLBs) with lithium-rich layered oxide (LLO) cathode materials can provide high energy density and safety. However, the development of these batteries is hindered by the poor anti-oxidation ability of polymer electrolytes. Herein, a propanesultone-based polymer electrolyte (PPS-PE) is designed, and a wide electrochemical stability window (& SIM;5.0 V vs. Li+/Li) and high ion transference number (& SIM;0.78) at 25 & DEG;C can be achieved. The strong anti-oxidation ability of PPS-PE is contributed by the design of the chain-like molecular structure, and the hydrogen bond interactions are beneficial for inhibiting the anion movement of Li salt. The PPS-PE-based SSLBs with LLO cathode materials show characteristic charge/discharge profiles with a high initial discharge capacity of & SIM;270 mA h g-1 and good cycling stability at 25 & DEG;C. Therefore, this work not only reports a novel polymer electrolyte to couple with high-voltage cathodes but also promotes the application of LLO cathode materials in high-energy SSLBs. A propanesultone-based polymer electrolyte with high ion transference number of & SIM;0.78 and wide electrochemical stability window of & SIM;5.0 V has been designed for solid-state lithium batteries with lithium-rich layered oxide cathode materials.