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

Abstract

The solvent-free manufacturing process for battery electrodes has gathered increased scientific interest due to its cost reduction, eco-friendliness, and ability to enhance electrode density. Carbon nanotubes (CNTs) are anticipated to improve battery performance, owing to their exceptional electrical conductivity and unique one-dimensional morphology. In this study, we demonstrate that the integration of ozone treatment for CNTs can further enhance the electrochemical performance of high-loading (30 mg/cm² or higher) dry-processed cathodes employing high-nickel active materials (NCM811). By comparing these cathodes with dry-processed cathodes using carbon black, a conventional conductive agent, we elucidate that the enhanced performance of single-walled (SW) CNT-based cathodes originates from the formation of a cathode-electrolyte interphase with favorable protective abilities and the capacity to suppress microcrack formation within NCM811 particles. The current study presents a promising strategy of incorporating SWCNTs with the tuned surface functionalities for the development of cost-effective, environmentally friendly dry battery manufacturing.