A poly(ionic liquid)s binder can provide stable performance of high-voltage composite cathodes based on lithium nickel cobalt aluminium oxide (LiNi_0.8Co_0.15Al_0.05O₂ or NCA), up to 4.5 V (vs. Li⁺/Li⁰) at 50 °C for an electrode with high areal capacity up to 1.6 mAh cm⁻². A reversible capacity of more than 150 mAh g⁻¹ in an all-solid-state device using a highly concentrated poly(ionic liquid)s-based composite polymer electrolyte is achieved with high-capacity retention on cycling. Characterization of the composite electrode and polymer electrolyte post-cycling using scanning electron microscopy confirms stable behaviour with only small volume changes evident. This report thus demonstrates these solid polymer electrolytes as promising for high energy density high-voltage all-solid-state lithium (Li) batteries.

聚（离子液体）粘合剂可提供基于锂镍钴铝氧化物（LiNi _0.8 Co _0.15 Al _0.05 O ₂或NCA）的高压复合阴极的稳定性能，最高可达4.5 V（vs. Li ⁺ / Li ⁰）在50°C下用于面积电阻高达1.6 mAh cm ^-2的电极。可逆容量大于150 mAh g ^-1在使用高浓度聚（离子液体）s基复合聚合物电解质的全固态装置中，可以实现高容量的循环保持率。使用扫描电子显微镜对复合电极和聚合物电解质的循环后进行表征，证实了稳定的行为，只有很小的体积变化明显。因此，该报告证明了这些固体聚合物电解质有望用于高能量密度的高压全固态锂（Li）电池。