Journal of Power Sources ( IF 9.2 ) Pub Date : 2020-09-17 , DOI: 10.1016/j.jpowsour.2020.228896 Chia-Hung Chao , Chien-Te Hsieh , Wen-Jie Ke , Li-Wei Lee , Yeou-Fu Lin , Hao-Wei Liu , Siyong Gu , Chun-Chieh Fu , Ruey-Shin Juang , Bikash Chandra Mallick , Yasser Ashraf Gandomi , Cherng-Yuh Su
Atomic layer deposition (ALD) on flexible substrates has rarely been demonstrated using roll-to-roll (R2R) coating configuration. We develop R2R ALD technique to uniformly coat TiO2 layer on the porous polyethylene (PE) separators for Li-ion batteries (LIBs). The R2R ALD method using titanium isopropoxide and water as the precursors enables a precise control over the growth of TiO2 nanolayer on PE separators. The TiO2-coated separators remarkably improve the LIB performance, as compared to the LIBs utilizing pristine polymeric membranes. The TiO2 deposition also enhances the thermal and dimensional stability, through forming a stabilizing and robust skeleton within the polymeric matrix. Accordingly, the TiO2 layers play a critical role in boosting the LIB performance, via increasing the ionic conductivity, decreasing high-frequency impedance, and enhancing the electrolyte wettability. Ultimately, the application of ceramic nanocoating on the PE-based porous separators results in improved safety, higher energy density, and excellent cycleability during high-temperature and long-duration cycling of LIBs. Thus, the TiO2-coated separators can be easily adopted to replace the commercially available separators due to excellent performance and reduced cost of manufacturing. The production rate of the ceramic separators can reach as high as 2.4 m min−1 fulfilling the requirements of the industrial and large-scale production.
中文翻译:
锂离子电池聚合物隔膜上的卷对卷原子层二氧化钛涂层沉积
使用卷对卷(R2R)涂层配置很少能证明在柔性基板上的原子层沉积(ALD)。我们开发了R2R ALD技术,将TiO 2层均匀地涂覆在用于锂离子电池(LIB)的多孔聚乙烯(PE)隔膜上。使用异丙醇钛和水作为前体的R2R ALD方法可以精确控制PE隔膜上TiO 2纳米层的生长。与利用原始聚合物膜的LIB相比,涂覆TiO 2的隔膜显着提高了LIB性能。TiO 2沉积通过在聚合物基体中形成稳定而坚固的骨架,还增强了热稳定性和尺寸稳定性。因此,TiO 2层通过增加离子电导率,降低高频阻抗和增强电解质的润湿性,在提高LIB性能方面起关键作用。最终,在基于PE的多孔隔膜上使用陶瓷纳米涂层可提高LIB的高温和长时间循环期间的安全性,更高的能量密度和出色的循环能力。因此,由于具有优异的性能和降低的制造成本,因此可以容易地采用涂覆有TiO 2的隔膜代替市售的隔膜。陶瓷隔板的生产率可以达到2.4m min -1,满足工业化和大规模生产的要求。