As a vital part of lithium-ion batteries (LIBs), the separator is closely related to the safety and electrochemical performance of LIBs. Despite the numerous membranes/separators available commercially, their thermal stability and service life still severely limit the efficiency and reliability of the battery. Herein, for the first time, we designed and prepared a hybrid ultra-high molecular weight polyethylene (UHMWPE)/silicon dioxide (SiO₂) nanocomposite membrane via a sequential biaxial stretching process. SEM, EDS, ATR-FTIR, WAXS and TGA characterizations offer clear evidence for the successful preparation of UWMWPE-SiO₂ nanocomposite membranes. The influence of SiO₂ on the structure and properties of UHMWPE membranes was systematically investigated. The presence of SiO₂ improves various fundamental properties of UHMWPE separators, such as thermal stability, electrolyte uptake and wettability, ionic conductivity, and electrochemical performance. Thus, obtained lithium-ion batteries have an excellent discharge capacity of 165 mAh g⁻¹ at 0.1 C-rate and 123 mAh g⁻¹ at 5 C-rate and a greater cycling performance over 100 cycles. Thus, this investigation delivers inspiration for the expansion of inorganic-organic nanocomposite separators for next-generation lithium-ion batteries.

作为锂离子电池（LIB）的重要组成部分，隔膜与LIB的安全性和电化学性能密切相关。尽管市售有许多膜/隔离物，但是它们的热稳定性和使用寿命仍然严重限制了电池的效率和可靠性。在此，我们首次通过顺序双轴拉伸工艺设计并制备了混合超高分子量聚乙烯（UHMWPE）/二氧化硅（SiO ₂）纳米复合膜。SEM，EDS，ATR-FTIR，WAXS和TGA表征为成功制备UWMWPE-SiO ₂纳米复合膜提供了明确的证据。SiO ₂的影响对超高分子量聚乙烯膜的结构和性能进行了系统研究。SiO ₂的存在改善了UHMWPE隔膜的各种基本性能，例如热稳定性，电解质吸收和润湿性，离子电导率以及电化学性能。因此，获得的锂离子电池具有165毫安g的优异的放电容量^{- 1}  0.1 C-速率和123毫安克^-1 在5℃ -速率和超过100个循环更大循环性能。因此，这项研究为扩展下一代锂离子电池的无机有机纳米复合隔膜提供了灵感。