Enhanced Rate Capability and Cycle Performance of Titanium-Substituted P2-Type Na0.67Fe0.5Mn0.5O2 as a Cathode for Sodium-Ion Batteries | Zendy

Joon-ki Park | Zendy; Geun-gyung Park | Zendy; Hunho H. Kwak | Zendy; SeungTae Hong | Zendy; Jaewon Lee | Zendy

Open Access

Enhanced Rate Capability and Cycle Performance of Titanium-Substituted P2-Type Na_0.67Fe_0.5Mn_0.5O₂ as a Cathode for Sodium-Ion Batteries

Author(s) -

Joon-ki Park,

Geun-gyung Park,

Hunho H. Kwak,

SeungTae Hong,

Jaewon Lee

Publication year - 2018

Publication title -

acs omega

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.779

H-Index - 40

ISSN - 2470-1343

DOI - 10.1021/acsomega.7b01481

Subject(s) - materials science , electrochemistry , doping , titanium , crystal structure , cathode , ion , phase (matter) , analytical chemistry (journal) , crystallography , metallurgy , electrode , chemistry , optoelectronics , organic chemistry , chromatography

In this study, we developed a doping technology capable of improving the electrochemical performance, including the rate capability and cycling stability, of P2-type Na 0.67 Fe 0.5 Mn 0.5 O 2 as a cathode material for sodium-ion batteries. Our approach involved using titanium as a doping element to partly substitute either Fe or Mn in Na 0.67 Fe 0.5 Mn 0.5 O 2 . The Ti-substituted Na 0.67 Fe 0.5 Mn 0.5 O 2 shows superior electrochemical properties compared to the pristine sample. We investigated the changes in the crystal structure, surface chemistry, and particle morphology caused by Ti doping and correlated these changes to the improved performance. The enhanced rate capability and cycling stability were attributed to the enlargement of the NaO 2 slab in the crystal structure because of Ti doping. This promoted Na-ion diffusion and prevented the phase transition from the P2 to the OP4/″Z″ structure.

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