Assembly and tests of coin and flexible pouch–type ASSLSBs

Coin cell–type and flexible pouch–type ASSLSBs were assembled in an argon-filled glovebox. We used the prepared KB@S composite electrode as the cathode, CSEs as both the electrolyte and separator, and lithium as the anode. The charge-discharge tests, rate capability, and long-term cycling performance tests were carried out at a constant current mode between 1.6 and 2.6 V at 60°C using Neware battery testers. Meanwhile, the EIS spectra of the cells were collected over the frequencies from 10⁵ to 10⁻² Hz using the GAMRY 1000E.