Constructing a Pvdf-Based Composite Solid-State Electrolyte with High Ionic Conductivity Li6.5la3zr1.5ta0.1n0.4o12 for Lithium Metal Battery Operating at Room Temperature

Abstract

A high-safety composite solid-state electrolyte (CSSE) was constructed by embedding the high ionic conductivity garnet type Li 6.5 La 3 Zr 1.5 Ta 0.1 Nb 0.4 O 12 (LLZTNO) powder into a polyvinylidene fluoride (PVDF) matrix. The ionic conductivity of the CSSE containing 10% LLZTNO could reach 1.05 ×10 -4 S/cm, and the electrochemical window was extended to 4.97 V vs Li/Li + . When paired with an NCM811 cathode, the batteries showed good rate cycling performance, and the discharge capacity could be maintained at 137.1 and 91.2 mAh/g at 0.3C and 2C after 80 and 100 cycles. The needle penetration test further demonstrated superior safety.

Keywords: PVDF, Composite solid-state electrolyte, lithium metal battery, Cryo-EM