Polyethylene oxide (PEO) based solid polymer electrolyte is expected to be the safe and high energy density lithium-ion batteries owing to leakage-free and good flexibility, but high crystallinity results in low ionic conductivity at room temperature. In this paper, different molecular weights of the polyhedral oligomeric silsesquioxane-polyethylene glycol (POSS-(PEG_w)₈, w = 1 K g/mol and 2 K g/mol) is synthesized by click reaction between azido polyhedral oligomeric silsesquioxane (POSS-N₃) and different weight of alkynyl methoxy polyethylene glycol (Alkynyl-PEG) are used as doped fillers to reduce the crystallinity of the PEO and enhance the ion conductivity of the electrolyte. The effect of the molecular weight of PEG in POSS-(PEG_w)₈ on the crystallinity and conductivity of composite solid polymer electrolytes (CSPEs) is analyzed and the result shows that PEO/POSS-(PEG_1K)₈ exhibits higher ionic conductivity (0.9 × 10⁻³ S·cm⁻¹ at 50 °C) and Li⁺ transference number (0.47) than PEO/POSS-(PEG_2K)₈. Simultaneously, PEO/POSS-(PEG_1K)₈ presents a superior electrochemical window of 5.08 V. The LiFePO₄‖PEO/POSS-(PEG_1K)₈–60%‖Li cell assembly reaches 133 mAh·g⁻¹ after 100 cycles. The high capacity and good cycle performance prove the feasibility of applying POSS-(PEG_w)₈ to CSPEs, which contributes to the practical application of lithium metal batteries.

基于聚环氧乙烷（PEO）的固体聚合物电解质由于无泄漏和良好的柔韧性而有望成为安全和高能量密度的锂离子电池，但是高结晶度导致室温下的离子电导率较低。本文通过叠氮多面体低聚倍半硅氧烷（POSS）之间的点击反应合成了不同分子量的多面体低聚倍半硅氧烷-聚乙二醇（POSS-（PEG _w）₈，w = 1 K g / mol和2 K g / mol） -N ₃）和不同重量的炔基甲氧基聚乙二醇（Alkynyl-PEG）用作掺杂填料，以降低PEO的结晶度并增强电解质的离子电导率。PEG分子量对POSS-（PEG _w）₈对复合固体聚合物电解质（CSPEs）的结晶度和电导率进行了分析，结果表明PEO / POSS-（PEG _1K）₈在50°C时具有较高的离子电导率（0.9×10 ^-3  S·cm ^-1）和Li ⁺转移数（0.47），高于PEO / POSS-（PEG _2K）₈。同时，PEO / POSS-（PEG _1K）_8所5.08 V.的LiFePO的呈现优异的电化学窗口₄ ‖PEO/ POSS-（PEG _1K）₈〜60％‖Li电池组件达到133毫安·克^-1100个周期后。高容量和良好的循环性能证明了将POSS-（PEG _w）₈应用于CSPE的可行性，这有助于锂金属电池的实际应用。