Morphologies of the PHE and the electrodes were studied by the transmission electron microscope (FEI Tecnai F20) and the scanning electron microscope (SEM, FEI Quanta 450 FEG). The mechanical performance of the PHE was investigated by the tensile test (CMT6103). Zn foil was used as the anode electrode (20 μm), LiCoO2, NCM811, and LNMO on Al foil with 1.5 mg cm−2 (coin cell) and 8 mg cm−2 (pouch cell) loading mass were used as the cathode. To enhance the compatibility of the electrode and the PHE, the as-fabricated solid batteries were stored at 110 °C for 2 h before the test. LAND CT2001A device and electrochemical workstation CHI 760D were used to collect the electrochemical properties of batteries.
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