Abstract Based on the urgent demand of excellent wetting mechanical strength electrospun nanofiber separators and some doping compounds which are beneficial to enhance electrochemical performance for Li-ion cell, in this study, a natty nanofiber composite membrane based on heat-resistant polyimide (PI) matrix via introducing polar Octa (γ-chloropropyl) polyhedral oligomeric silsesquioxane (OCP-POSS) nanoparticles for the first time is resoundingly prepared by electrospinning technology. The hybrid PI/OCP-POSS separator (HOPS separator) with 3.5 wt% OCP-POSS nanoparticles presents significant improvement in wetting mechanical strength (11.8 MPa), eminent electrolyte retention rate (1025%) together with a tendency of gelation phase and still exerts laudable high thermal stability. Meanwhile, the battery with the HOPS separator exhibits preferable electrochemical stability window (5.2 V) and exceedingly excellent ionic conductivity (2.8 × 10−3 S cm−1). The most extraordinary is that the capacity retention reaches up to 81.45% after 100 cycles at 0.2 C and 91.96% in C-rates test, while the pristine PI separator merely achieves to 56.03% and 75.90%, respectively. In addition, the modified separator possesses more stable cycling properties than PP separator (Celgard 2400) at 1 C and 2 C rate, respectively, which all fully signifies that the heat-resistant HOPS separator has great application prospects in high-performance and advanced-safety lithium-ion battery.

中文翻译：

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功能化极性八（γ-氯丙基）多面体低聚倍半硅氧烷辅助聚酰亚胺纳米纤维复合膜具有优异的离子导电性和润湿机械强度，可用于增强型锂离子电池

摘要 基于对优异的润湿机械强度电纺纳米纤维隔膜和一些有利于提高锂离子电池电化学性能的掺杂化合物的迫切需求，本研究基于耐热聚酰亚胺（PI）基体制备了一种整洁的纳米纤维复合膜。通过引入极性八（γ-氯丙基）多面体低聚倍半硅氧烷（OCP-POSS）纳米颗粒，首次采用静电纺丝技术制备。含有 3.5 wt% OCP-POSS 纳米颗粒的混合 PI/OCP-POSS 隔膜（HOPS 隔膜）在润湿机械强度（11.8 MPa）、优异的电解质保留率（1025%）以及凝胶相趋势方面表现出显着改善，并且仍然发挥着值得称赞的高热稳定性。同时，带有 HOPS 隔膜的电池表现出更好的电化学稳定性窗口 (5.2 V) 和非常出色的离子电导率 (2.8 × 10-3 S cm-1)。最不寻常的是，在 0.2 C 和 91.96% 的 C-rates 测试中，100 次循环后的容量保持率达到了 81.45%，而原始 PI 隔膜仅分别达到了 56.03% 和 75.90%。此外，改性隔膜分别在1 C和2 C倍率下具有比PP隔膜（Celgard 2400）更稳定的循环性能，这充分表明耐热HOPS隔膜在高性能和先进的应用方面具有广阔的应用前景。安全锂离子电池。在 C-rates 测试中，在 0.2 C 和 91.96% 下循环 100 次后为 45%，而原始 PI 隔膜仅分别达到 56.03% 和 75.90%。此外，改性隔膜分别在1 C和2 C倍率下具有比PP隔膜（Celgard 2400）更稳定的循环性能，这充分表明耐热HOPS隔膜在高性能和先进的应用方面具有广阔的应用前景。安全锂离子电池。在 C-rates 测试中，在 0.2 C 和 91.96% 下循环 100 次后为 45%，而原始 PI 隔膜仅分别达到 56.03% 和 75.90%。此外，改性隔膜分别在1 C和2 C倍率下具有比PP隔膜（Celgard 2400）更稳定的循环性能，这充分表明耐热HOPS隔膜在高性能和先进的应用方面具有广阔的应用前景。安全锂离子电池。