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
Manojkumar Seenivasan
Battery Research Center of Green Energy, Ming Chi University of Technology, New Taipei City, 24301, Taiwan, R.O.C
Chelladurai Karuppiah
Battery Research Center of Green Energy, Ming Chi University of Technology, New Taipei City, 24301, Taiwan, R.O.C; Corresponding author.
Bo-Rong Zhang
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
Jeng-Ywan Shih
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
Ying-Jeng James Li
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
Tai-Feng Hung
Battery Research Center of Green Energy, Ming Chi University of Technology, New Taipei City, 24301, Taiwan, R.O.C
Wen-Chen Chien
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
Sayee Kannan Ramaraj
PG and Research Department of Chemistry, Thiagarajar College, Madurai, Tamil Nadu, India
Rajan Jose
Nanostructured Renewable Energy Materials Laboratory, Faculty of Industrial Sciences and Technology, University Malaysia Pahang, 26300 Kuantan, Malaysia
Chun-Chen Yang
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; Department of Chemical and Materials Engineering & Center for Sustainability and Energy Technologies, Chang Gung University, Taoyuan City 333, Taiwan; Corresponding author.Battery Research Center of Green Energy, Ming Chi University of Technology, New Taipei City, 24301, Taiwan, R.O.C.
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⁻1 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.
