Open AccessPerspective—Potential Benefit of Li-Rich Cathode Materials: Reduction of Co and Ni Content Rather than Achievement of Ultra-High Capacities
Author(s) -
Roy Benedek
Publication year - 2022
Publication title -
journal of the electrochemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.258
H-Index - 271
eISSN - 1945-7111
pISSN - 0013-4651
DOI - 10.1149/1945-7111/ac69c3
Subject(s) - cathode , manganese , fade , materials science , coating , cycling , voltage , lithium (medication) , chemical engineering , capacity loss , electrochemistry , chemistry , nanotechnology , electrode , metallurgy , computer science , electrical engineering , medicine , archaeology , engineering , endocrinology , history , operating system
In the conventional cycling protocol for lithium and manganese rich NMC layered oxides (LMRNMC), the upper cutoff voltage Vcut is extended to ~ 4.8, to achieve capacities of ~ 250 mAh/g. With this mode of operation, structural rearrangements result in voltage fade upon cycling. A strategy is proposed to avoid these structural rearrangements based on (a) restricting Vcut to values < ~4.6 to shut down the bulk instabilities, and (b) application of a (preferably) semi-coherent coating that protects the surface oxygen. The potential benefit of this strategy would be to minimize Co and Ni content, compared to Ni-rich NMC.