To significantly improve the electrochemical performance of LiMn₂O₄, we proposed a simple and low-cost co-modification approach based on the synergistic effect of poly(ethylene glycol) (PEG) and carbon nanotubes (CNT). The CNT@PEG@LiMn₂O₄ (CNT@PEG@LMO) composite was prepared by ultrasound assisted wet-coating method. PEG is a highly conductive ionic conductor, which can improve the transport efficiency of lithium ions, and CNT is a good electronic conductor, which possesses excellent electrical conductivity. Moreover, the combination of PEG and CNT can effectively inhibit the dissolution of manganese and promote the uniform distribution of LiMn₂O₄ octahedra. The structure and surface morphology of the CNT@PEG@LMO composite were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The electrochemical test result showed that the initial discharge capacity of the CNT@PEG@LMO composite could reach up to 123.8 mAh g⁻¹ at 1.0 C with capacity retention of 95.2 % after 100 cycles, which is higher than that of the unmodified LiMn₂O₄ sample. The high-rate capability of the CNT@PEG@LMO composite was significantly improved. When cycled at 55 °C, the CNT@PEG@LMO composite could show good cycling stability and rate performance. Such excellent electrochemical performance is due to close association with the synergistic effect of PEG and CNT.

为了显着提高 LiMn ₂ O ₄的电化学性能，我们提出了一种基于聚乙二醇 (PEG) 和碳纳米管 (CNT) 协同效应的简单且低成本的共改性方法。CNT@PEG@LiMn ₂ O ₄ (CNT@PEG@LMO)复合材料采用超声辅助湿法涂覆法制备。PEG是一种高导电离子导体，可以提高锂离子的传输效率，而CNT是一种良好的电子导体，具有优良的导电性。此外，PEG与CNT的结合能有效抑制锰的溶解，促进LiMn ₂ O ₄的均匀分布八面体。通过X射线衍射（XRD）和扫描电子显微镜（SEM）对CNT@PEG@LMO复合材料的结构和表面形貌进行了表征。电化学试验的结果表明，初始放电容量的CNT @ PEG @ LMO复合度可达123.8毫安克^-1以1.0C与100次循环后95.2％的容量保持率，其比未改性的LiMn高₂ O ₄样品。CNT@PEG@LMO 复合材料的高倍率性能显着提高。当在 55°C 下循环时，CNT@PEG@LMO 复合材料可以表现出良好的循环稳定性和倍率性能。如此优异的电化学性能是由于与 PEG 和 CNT 的协同效应密切相关。