Perspective—Potential Benefit of Li-Rich Cathode Materials: Reduction of Co and Ni Content Rather than Achievement of Ultra-High Capacities. Issue 5 (1st May 2022)

• Record Type: Journal Article
• Authors: Benedek, Roy
• Is Part Of: Journal of the Electrochemical Society. Volume 169:Issue 5(2022)
• Publication Date: 2022-05-01
• Subjects: Electrochemistry -- Periodicals; 541.3705
• DOI: 10.1149/1945-7111/ac69c3
• Languages: English
• ISSNs: 0013-4651

Abstract

Abstract : In the conventional cycling protocol for lithium and manganese rich NMC layered oxides (LMRNMC), the upper cutoff voltage V cut is extended to ∼ 4.8, to achieve capacities of ∼ 250 mAh g −1 . 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 V cut 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.