Cathode

Controlling Ni And Mn Content In Cathode Materials For Sodium-Ion Batteries

Cathode

Controlling Ni And Mn Content In Cathode Materials For Sodium-Ion Batteries

Effect of Mn/Ni content on the SIB cathode material performance C. Hakim and coworkers synthesized five variations of the layered oxide Na0.7CoxMnyNizO2 (x+y+z=1) to investigate the influence of altering transition metal (TM) compositions and reducing cobalt on electrochemical characteristics and performance. An increase in Mn content led to a decrease in initial discharge capacity. However, after 100 cycles, capacity retention exhibited higher values (~94-95% as compared to 90-91% retention in materials with lower Mn and higher Co). Increased Ni content led to a mixed-phase material (P2 and P3) and showed elevated discharge capacity near 120 mAh/g but reduced rate capability. Fig. 2) SEM images of a) P2-Na0.7Co0.5Mn0.33Ni0.16O2, b) P2-Na0.7Co0.4Mn0.43Ni0.16O2, c) P2-Na0.7Co0.3Mn0.53Ni0.16O2, d) P2/P3-Na0.7Co0.4Mn0.33Ni0.26O2 and e) P2/P3- Na0.7Co0.3Mn0.33Ni0.36O2.

Cycling performance of the different electrode materials at C/10.

Academia | P. 206 Source: C. Hakim, H. D. Asfaw, R. Younesi, D. Brandell, K. Edström, I. Saadoune

The content of Mn and Ni in NaxTMO2 (T = transition metal) layered oxide cathode materials affects battery performance: Increased Mn content produces better cycle life performance while higher Ni helps achieve higher discharge capacities..

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