Upgrading the Properties of Ceramic-Coated Separators for Lithium Secondary Batteries by Changing the Mixing Order of the Water-Based Ceramic Slurry Components

Developing uniform ceramic-coated separators in high-energy Li secondary batteries has been a challenging task because aqueous ceramic coating slurries have poor dispersion stability and quality on the hydrophobic surfaces of polyolefin separators. In this study, we develop simple but effective strategy for improving by changing mixing order slurry components. The comprises ceramics (Al2O3), polymeric binders (sodium carboxymethyl cellulose, CMC), surfactants (disodium laureth sulfosuccinate, DLSS), water. interaction between components is studied quantitatively evaluating using Lumisizer. optimized sequence, Al2O3 DLSS premixed Al2O3-DLSS micelles through strong surface interactions, they repel each other due to steric repulsion. addition CMC state does not compromise enables polyethylene (PE) prepared (Al2O3–CCSs) exhibit improved physical properties, such as high wettability electrolyte uptake ionic conductivity, compared bare PE Furthermore, Al2O3–CCSs electrochemical performance, rate capability cycling performance. half cells (LiMn2O4/Li metal) comprising retain 90.4% (88.4 mAh g−1) initial discharge capacity after 150 cycles, while 27.6% (26.4 PE. full (LiMn2O4/graphite) consisting 69.8% (72.2 24.9% (25.0 1150 cycles.