High Performance LiCoO[sub 2] Cathode Materials at 60°C for Lithium Secondary Batteries Prepared by the Facile Nanoscale Dry-Coating Method

A mass scalable dry-coating method was used on a cathode to improve cycling stability at and, in contrast to the conventional wet-coating method, this one did not require a solvent. Electrochemical results of the , , and coatings on cathodes showed a fast capacity fade, resulting in capacity retention at under 1C rate cycling, whereas an uncoated cathode showed 64% retention. This difference was believed to be because the residual coating layers which did not react with the bulk layer accelerated the side reactions with the electrolytes at , leading to increased formation of the surface films. However, when and were used for dry coating, the coating layers completely disappeared, but a higher concentration of coating elements was found near the surfaces. Overall, the cathodes coated with and exhibited 79 and 88% capacity retention, respectively, at under 1C rate cycling.