Novel Ti(III)/Ti(IV) mixed-valence doping for enhancing both the structural stability and specific capacity of P2 layered Na 0.67 Ni 0.2 Mn 0.8 O 2 cathode for sodium-ion batteries

Key Points

• This research aims to improve the structural stability and specific capacity of P2 layered Na0.67Ni0.2Mn0.8O2 cathodes for sodium-ion batteries through Ti doping.
• Utilized mixed-valence Ti(III)/Ti(IV) doping in P2 layered Na0.67Ni0.2Mn0.8O2 cathodes.
• Conducted cycling tests to assess structural stability and specific capacity.
• Analyzed the impact of doping on Jahn-Teller distortion during battery operation.
• Ti(III)/Ti(IV) doping significantly enhances the structural stability of the cathode during cycling.
• Doped cathodes showed improved specific capacity compared to undoped samples.
• Reduction in Jahn-Teller distortion was observed with doping.