Regulating the electrochemical activity of Fe-Mn-Cu-based layer oxides as cathode materials for high-performance Na-ion battery

Fe-Mn based layer oxides cathode materials have attracted widespread attention as a potential candidate for sodium-ion batteries (SIBs) owing to the earth abundance, cost-effectiveness and acceptable specific capacity. However, the irreversible phase transition often brings rapid capacity decay, which seriously hinders the practical application in large-scale energy storage. Herein, we design a nickel-doped Na0.70Fe0.10Cu0.20Ni0.05Mn0.65O2 (NFCNM-0.05) cathode material of SIBs with activated anionic redox reaction, and then inhibit the harmful phase transition. The ex-situ X-ray diffraction patterns demonstrate the NFCNM-0.05 always keeps the P2 phase during the sodiation/desodiation process, indicating a high…

• NN
  National Natural Science Foundation of China

  Award: U1960107
• NS
  Natural Science Foundation of Hebei Province

  Awards: A202005018, E2022501014
• FR
  Fundamental Research Funds for the Central Universities

  Award: N2123034