Future-Oriented Electrode Achieved by in-situ Generated Tetrahydrofuran-Based Binder

To align with the future trend of all-solid-state batteries, and meet the growing demands for flexible wearable devices, higher standards are required for electrode fabrication. It is imperative to strike a balance between electrochemical performance, particularly at subzero temperatures, and mechanical flexibility, while ensuring compatibility with existing preparation processes. This formidable challenge has been achieved by in-situ generated tetrahydrofuran-based binder to crosslink conventional, as well as binder-free electrodes. This binder inherits the excellent ionic conductivity of tetrahydrofuran at low temperature, and overcomes the long-standing mechanical stability issue of tetrahydrofuran-based polymers. In comparison with the counterpart, the self-generated binder electrode demonstrates a substantial enhancement in capacity retention at 1 C after 100 cycles, with an increase from 74% to over 95%. Notably, even at the temperature as low as − 30°C, the capacity retention remains above 85% after 5000 cycles at a rate of 3 C. This electrode product can meet the stretching and bending requirements of flexible wearable devices, even perfectly resolve the stubborn interface compatibility issue of oxide ceramic solid electrolytes. This work provides a revolutionary approach to electrode preparation that can keep pace with the diverse development of future batteries.