High-Voltage Sodium Layered Cathode Stabilized by Bulk Complex-Composition Doping to Surface Phosphate Coating Design

Layered oxides are considered promising cathode materials for sodium-ion batteries (SIBs) due to their high energy density, flexible compositions, and low cost. However, they encounter significant challenges, such as multiphase transitions and structural instability at high voltages, which limit their large-scale practical application. In this study, we employed a dual modification strategy involving complex composition doping and phosphate coating to fabricate the Na0.67Ni0.255Mn0.645(TiMgCuZn)0.1O2@phosphate cathode (D-NNM). The lattice distortion induced by complex composition doping optimizes the overall properties of the cathode, while the phosphate coating forms a robust electrode interface through…

• GS
  Guangdong Science and Technology Department

  Award: 2023A1515110099
• GU
  Guangdong University of Technology

  Awards: 220418136, 263113491
• GM
  Guangzhou Municipal Science and Technology Bureau

  Award: SL2022A04J01299