Wu Xiao-Wei, Seenivasan Manojkumar, Karuppiah Chelladurai, Zhang Bo-Rong, Shih Jeng-Ywan, James Li Ying-Jeng, Hung Tai-Feng, Chien Wen-Chen, Ramaraj Sayee Kannan, Jose Rajan, Yang Chun-Chen
Battery Research Center of Green Energy, Ming Chi University of Technology, New Taipei City, 24301, Taiwan, R.O.C.
Department of Chemical Engineering, Ming Chi University of Technology, New Taipei City 243, Taiwan, R.O.C.
Heliyon. 2024 Jul 14;10(14):e34436. doi: 10.1016/j.heliyon.2024.e34436. eCollection 2024 Jul 30.
Current commercial separators used in lithium-ion batteries have inherent flaws, especially poor thermal stability, which pose substantial safety risks. This study introduces a high-safety composite membrane made from electrospun poly(vinyl alcohol)-melamine (PVAM) and polyvinylidene fluoride (PVDF) polymer solutions via a dip coating method, designed for high-voltage battery systems. The poly(vinyl alcohol) and melamine components enhance battery safety, while the PVDF coating improves lithium-ion conductivity. The dip-coated PVDF/Esp-PVAM composite separators were evaluated for electrolyte uptake, contact angle, thermal stability, porosity, electrochemical stability and ionic conductivity. Notably, our Dip 1 % PVDF@Esp-PVAM composite separator exhibited excellent wettability and a lithium-ion conductivity of approximately 7.75 × 10⁻⁴ S cm⁻ at room temperature. These separators outperformed conventional PE separators in half-cells with Ni-rich NCM811 cathodes, showing exceptional cycling stability with 93.4 % capacity retention after 100 cycles at 1C/1C, as compared to 84.8 % for PE separators. Our Dip 1 % PVDF@Esp-PVAM composite separator demonstrates significant potential for enhancing the long-term durability and high-rate performance of lithium-ion batteries, making it a promising option for long-term energy storage applications.
目前锂离子电池中使用的商用隔膜存在固有缺陷，尤其是热稳定性差，这带来了重大安全风险。本研究通过浸涂法介绍了一种由静电纺丝的聚乙烯醇-三聚氰胺（PVAM）和聚偏氟乙烯（PVDF）聚合物溶液制成的高安全性复合隔膜，专为高压电池系统设计。聚乙烯醇和三聚氰胺成分提高了电池安全性，而PVDF涂层提高了锂离子传导率。对浸涂的PVDF/Esp-PVAM复合隔膜进行了电解液吸收率、接触角、热稳定性、孔隙率、电化学稳定性和离子传导率的评估。值得注意的是，我们的1%PVDF@Esp-PVAM复合隔膜在室温下表现出优异的润湿性和锂离子传导率，约为7.75×10⁻⁴ S cm⁻。在具有富镍NCM811阴极的半电池中，这些隔膜的性能优于传统的PE隔膜，在1C/1C下100次循环后容量保持率为93.4%，而PE隔膜为84.8%。我们的1%PVDF@Esp-PVAM复合隔膜在提高锂离子电池的长期耐久性和高倍率性能方面显示出巨大潜力，使其成为长期储能应用的一个有前景的选择。
