Enhanced oxygen redox reversibility and capacity retention of titanium-substituted Na4/7[□1/7Ti1/7Mn5/7]O2 in sodium-ion batteries

The reversibility of oxygen anion redox is remarkably improved for partially Ti-substituted Na 4/7 [□ 1/7 Ti 1/7 Mn 5/7 ] and operates at a higher potential ( vs. Na/Na + ) compared with the parent material Na 4/7 [□ 1/7 Mn 6/7 ].