Partially Neutralized Polyacrylic Acid as an Efficient Binder for Aqueous Ceramic-coated Separators for Lithium-ion Batteries

Chem Asian J. 2023 Aug 6:e202300538. doi: 10.1002/asia.202300538. Online ahead of print.ABSTRACTA 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 145.0mAh/g after 200 cycles at 1C at room temperature in half cells (LFP/Li metal).PMID:37544905 | DOI:10.1002/asia.202300538

Source: Chemistry, an Asian Journal - August 6, 2023 Category: Chemistry Authors: Ai Qin Thang Yuejun Shen Zugui Shi Ge Yao Sun Yew Wong Zhaolin Liu Qingyu Yan Source Type: research