Long-Term Cycling Performance of Aqueous Processed Ni-Rich LiNi<sub>0.8</sub>Co<sub>0.15</sub>Al<sub>0.05</sub>O<sub>2</sub> Cathodes
Michael Hofmann, Felix Nagler, Uwe Guntow, Gerhard Sextl, Guinevere A. Giffin
Abstract
A lithium phosphate surface coating can protect water-sensitive LiNi 0.8 Co 0.15 Al 0.05 O 2 (NCA) particles during aqueous electrode manufacturing. Herein, the coating process was performed by using a spray drying process, an easy method for upscaling. The coating provides enhanced protection against water that is reflected in a significantly reduced formation of detrimental water-induced surface species. As a consequence, full cells containing water-based electrodes with coated NCA and graphite anodes demonstrate good long-term 1C cycling performance with a capacity retention of 80% maintained after more than 730 cycles and a remaining capacity of approximately 130 mAh g −1 .