Thang Ai Qin, Shen Yuejun, Shi Zugui, Yao Ge, Wong Sun Yew, Liu Zhaolin, Yan Qingyu
School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore, 639798, Singapore.
Personal and Home Care, Lubrizol Southeast Asia Pte. Ltd., 44 Tanjong Penjuru, Singapore, 609032, Singapore.
Chem Asian J. 2023 Sep 15;18(18):e202300538. doi: 10.1002/asia.202300538. Epub 2023 Aug 10.
A partially neutralized polyacrylic acid (Pn-PAA) is used for coating sub-micron-sized α-alumina on a conventional microporous polyolefin separator, fabricating a ceramic-coated separator (CCS). Pn-PAA acts as a dispersant and binder by adsorbing itself on alpha(α)-alumina surfaces under acidic condition through the columbic interaction, providing a repulsive force to disperse fine alumina in aqueous suspension, and binds alumina strongly on plasma-treated separator through hydrogen bonding. This CCS shows favorable wettability in carbonate-based liquid electrolyte and ionic conduction due to the high hydrophilicity of Pn-PAA and alumina. With that, this study found that Pn-PAA-made-CCS yields a substantial adhesion strength of ~106 N/m with enhanced cycle stability, a specific capacity of 145.0 mAh/g after 200 cycles at 1 C at room temperature in half cells (LFP/Li metal).
一种部分中和的聚丙烯酸（Pn-PAA）被用于在传统的微孔聚烯烃隔膜上涂覆亚微米尺寸的α-氧化铝，从而制备出一种陶瓷涂覆隔膜（CCS）。在酸性条件下，Pn-PAA通过静电相互作用吸附在α-氧化铝表面，充当分散剂和粘合剂，在水悬浮液中提供排斥力以分散细小的氧化铝，并通过氢键将氧化铝牢固地结合在经过等离子体处理的隔膜上。由于Pn-PAA和氧化铝具有高亲水性，这种CCS在基于碳酸盐的液体电解质中表现出良好的润湿性和离子传导性。据此，本研究发现，由Pn-PAA制成的CCS产生了约106 N/m的显著粘附强度，在室温下的半电池（LFP/锂金属）中以1 C进行200次循环后，比容量为145.0 mAh/g，循环稳定性增强。
