The study found that surface degradation was the primary issue for cathodes with 80% nickel, while higher nickel content (85% or more) led to particle isolation and detachment, further reducing battery efficiency. Using this knowledge, the researchers developed a modified Ni-rich cathode with an optimized surface and structure. These cathodes featured a columnar design, which significantly reduced particle detachment and improved overall stability.
When tested in a pouch-type full cell with a C/Ag anode-less electrode, the newly designed cathodes retained 80.2% of their initial capacity after 300 charge cycles. This marks a significant step toward improving ASSBs, making them more reliable and suitable for widespread adoption.