Zeolite β-Hydrogen Composite Polymer Electrolyte for Enhanced Lithium Anode Performance

The unstable interface of solid polymer electrolyte (SPE) with Li anode and the low ionic conductivity of polyethylene oxide (PEO)-based SPE limit them from being used in pioneering all-solid-state lithium metal batteries (ALMBs). A composite-polymer-electrolyte (CPE) with zeolite filler can resolve the above concerns. In this regard, zeolite β-hydrogen (H-BEA) filler is used to synthesize CPE (CPE-H). CPE-H offered an ionic conductivity of ∼4.37 × 10⁻⁴ S cm⁻¹ at 60°C and resulted in a Li-ion transference number of ∼0.62. Galvanostatic lithium plating and stripping (GLPS) was carried out for various current densities. The obtained values of overpotential are 8, 19, 37, and 58 mV at current densities of 50, 100, 200, and 300 µA cm⁻², respectively. Long cycling GLPS profile revealed an excellent compatibility with the Li anode, over 2000 h at a high current density of 100 µA cm⁻². CPE-H has the potential to be used in high performance and durable ALMBs.