POS6-0638
Multifunctional Small-Molecule-Reinforced Polyacrylic Acid-Based Primer Binders for Low-Temperature Interfacial Adhesion in Dry-Processed LiFePO₄ Electrodes
Topic
S6. Emerging Polymer and Hybrid Materials for Advanced Energy Storage and Conversion
When and Where
Sep 29, 2026
08:30 - 09:30
Room 301 (Grand Ballroom)
Session Chairs
Hae Jung SON
Boseok KANG
Presenter(s)
Yoo Jeong Huh (Department of Chemical Engineering, Pohang University of Science and Technology (POSTECH), Pohang 37673, Republic of Korea.)
Co-Author(s)
Abstract
Dry-processed electrodes enabled by fibrillated polytetrafluoroethylene (PTFE) binders are regarded as a sustainable approach to lithium-ion battery manufacturing because they eliminate energy-consuming drying processes while enabling thick, high-energy-density electrodes. However, PTFE-based dry electrodes generally exhibit poor adhesion to current collectors owing to the chemically inert and low-polarity nature of PTFE. The resulting weak interfacial contact increases contact resistance and deteriorates electrochemical performance, particularly under high-loading conditions. Although conventional primer binders, including styrene–butadiene rubber (SBR), carboxymethyl cellulose (CMC), and poly(vinylidene fluoride) (PVDF), have been employed to improve adhesion between dry electrodes and current collectors, strong adhesion generally requires elevated lamination temperatures. This requirement diminishes the energy-saving and processing advantages of dry-electrode fabrication. Herein, tannic acid (TA) and phytic acid (PhyA) were incorporated as adhesion-promoting additives into poly(acrylic acid) (PAA)-based primer binders. The pyrogallol groups of TA and inositol phosphate groups of PhyA provide abundant interaction sites at the electrode–current collector interface, enabling strong adhesion at reduced lamination temperatures. The optimized PAA–TA and PAA–PhyA primer layers achieved an adhesion strength of up to 52.8 gf/20 mm, offering a promising route toward energy-efficient and high-throughput dry-electrode manufacturing. Owing to the enhanced interfacial integrity, the LiFePO₄||Li half-cell retained a specific capacity of 157.9 mAh g⁻¹ after 50 cycles at 0.5C, corresponding to a capacity retention of 99.9%. These results demonstrate that PAA-based primer binders incorporating multifunctional small-molecule additives offer a practical interfacial engineering strategy for scalable and energy-efficient dry-electrode manufacturing.
