Electrolytes with high Li⁺ transference number and good electrochemical stability are urgently needed for high-energy-density Li battery. In this paper, we present newly synthesized ionic liquid (IL)-based polymer electrolyte using polymer poly(ethylene oxide) (PEO), salt lithium bis(fluorosulfonly)imide (LiFSI), and IL 1-butyl-3-methylpyridinium bis(trifluoromethylsulfonyl)imide (BMPyTFSI) by solution cast technique. They show high Li⁺ transference number and good electrochemical and thermal stability. Also, nickel-rich layered cathode material LiNi_0.90Co_0.05Al_0.05O₂ (NCA) with good electrochemical performance for lithium secondary battery is successfully synthesized by Co-precipitation method. Using the optimized polymer electrolyte and NCA cathode, Li cell is prepared which shows initial discharge capacity of ~ 137 mAh g⁻¹ at 0.1 C-rate and good Coulombic efficiency ~96.0% upto 125 cycles.

高能量密度Li电池迫切需要具有高Li ⁺转移数和良好电化学稳定性的电解质。在本文中，我们介绍了新合成的基于离子液体（IL）的聚合物电解质，该电解质使用聚合物聚（环氧乙烷）（PEO），盐双（氟磺酰亚胺）酰亚胺锂（LiFSI）和IL 1-丁基-3-甲基吡啶双（三氟甲基磺酰基）酰亚胺（BMPyTFSI）通过溶液浇铸技术。它们显示出高的Li ⁺转移数以及良好的电化学和热稳定性。另外，富镍层状正极材料LiNi _0.90 Co _0.05 Al _0.05 O ₂共沉淀法成功合成了具有良好电化学性能的锂二次电池（NCA）。使用优化的聚合物电解质和NCA阴极，制备了Li电池，该锂电池在0.1 C速率下显示约137 mAh g ^-1的初始放电容量，在125个循环后的库仑效率约为96.0％。