Dry-processed ultra-high-energy cathodes (99.6wt%, 4.0 g cm−3) using single-crystalline Ni-rich oxides

Abstract

As the electric vehicle market rapidly expands as an eco-friendly means of transportation, there is a growing demand for innovative manufacturing processes that achieve high energy density while being environmentally sustainable and energy-efficient. To address these challenges, we developed a cathode using a solvent-free electrode process with single-crystalline LiNi_0.8Co_0.15Al_0.05O₂ (SCNCA), renowned for its mechanical robustness and high specific capacity. This process involves conformal layers of carbon nanotubes (CNTs) on SCNCA particles, resulting in superior Li⁺/electronic conductivity along with a cathode active-material ratio of 99.6 wt. %, electrode density of 4.0 g cm⁻³, and volumetric capacity of 835 mAh cm⁻³. Furthermore, the 3D digital twin analysis of the dry electrode elucidated the key features responsible for its outstanding electrochemical performance with remarkable clarity. This novel combination of CNT wrapping with solvent-free electrode processing not only increases the energy density but also improves the industrial feasibility of solvent-free electrodes for commercial LIBs application.