For solid-state electrolyte in lithium-ion batteries, high crystal boundary impedance leads to tough electrolyte-electrode interfacial issues. Here, we introduce garnet Li_6.4La₃Zr_1.4Ta_0.6O₁₂ (LLZTO) nanoparticles and succinonitrile (SN) into thermal polyurethane (TPU) to fabricate a composite solid-state electrolyte (TPU/LLZTO/SN), achieving high ionic conductivity of 6.452 × 10⁻⁴ S cm⁻¹. The TPU polymer with specific soft and hard segments allows lithium ions fast transport and holds good mechanical strength as the electrolyte matrix. The ionic conductor LLZTO further improves the ionic conductivity and mechanical property of the composite electrolyte membrane. Additional SN supplies the electrolyte’ wide electrochemical stabilization window, and enhances the metallic lithium compatibility of the TPU matrix. As a result, the as prepared TPU/LLZTO/SN electrolyte presents high lithium ions transference number of 0.64, and also good mechanical property.

对于锂离子电池中的固态电解质，高晶界阻抗会导致严重的电解质-电极界面问题。在这里，我们将石榴石 Li _6.4 La ₃ Zr _1.4 Ta _0.6 O ₁₂ (LLZTO) 纳米粒子和丁二腈 (SN) 引入热聚氨酯 (TPU) 中以制造复合固态电解质 (TPU/LLZTO/SN)，实现高离子电导率6.452 × 10 ⁻⁴ S cm ⁻¹. 具有特定软硬段的TPU聚合物允许锂离子快速传输并作为电解质基质保持良好的机械强度。离子导体LLZTO进一步提高了复合电解质膜的离子电导率和机械性能。额外的 SN 提供了电解质的宽电化学稳定窗口，并增强了 TPU 基质的金属锂相容性。因此，所制备的 TPU/LLZTO/SN 电解质具有 0.64 的高锂离子迁移数和良好的机械性能。