Ozone-Treated Carbon Nanotube as a Conductive Agent for Dry-Processed Lithium-Ion Battery Cathode

Abstract

The solvent-free manufacturing process for battery electrodeshasgathered increased scientific interest due to its cost reduction,eco-friendliness, and ability to enhance electrode density. Carbonnanotubes (CNTs) are anticipated to improve battery performance, owingto their exceptional electrical conductivity and unique one-dimensionalmorphology. In this study, we demonstrate that the integration ofozone treatment for CNTs can further enhance the electrochemical performanceof high-loading (30 mg/cm(2) or higher) dry-processed cathodesemploying high-nickel active materials (NCM811). By comparing thesecathodes with dry-processed cathodes using carbon black, a conventionalconductive agent, we elucidate that the enhanced performance of single-walled(SW) CNT-based cathodes originates from the formation of a cathode-electrolyteinterphase with favorable protective abilities and the capacity tosuppress microcrack formation within NCM811 particles. The currentstudy presents a promising strategy of incorporating SWCNTs with thetuned surface functionalities for the development of cost-effective,environmentally friendly dry battery manufacturing.