A stretchable all-solid-state polymer electrolyte with decoupled ion transport and mechanical supporting networks to achieve high and stable ion-conductivity

The rapid development of wearable electronics demands for high-safety and stretchable lithium-ion batteries which are closer to the human skin, then accelerating the requirement for all-solid-state electrolytes with high stretchability and ion conductivity. Here, we proposed a decoupling strategy to effectively overcome the theoretical tradeoff between mechanical properties and ion conductivity of all-solid-state polymer electrolytes . The prepared stretchable all-solid-state polymer electrolyte (SSPE) via UV polymerization exhibits outstanding elastic tensile properties with elongation at break around 160.38%. The most interesting thing is that the SSPE membrane maintain high ion conductivity under external stress, the ion conductivity is 4.65 × 10 −4  S cm −1 (0% strain) and 4.24 × 10 −4  S cm −1 (75% strain) at room temperature . In addition, the SSPE membrane shows an excellent electrochemical stability window up to 5.2 V ( vs. Li + /Li). The practicality of the SSPE was also investigated, including cell performance, deformation tests and destruction experiments. Therefore, the reported design of decoupling dual-function networks provides a promising approach for creating all-solid-state polymer electrolytes with high safety for stretchable energy storage applications .