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

Title
Enhanced Rate Capability and Cycle Performance of Titanium-Substituted P2-Type Na0.67Fe0.5Mn0.5O2 as a Cathode for Sodium-Ion Batteries
Authors
Park, J.-K.Park, G.-G.Kwak, Hun HoHong, Seung TaeLee, J.-W.
DGIST Authors
Hong, Seung Tae
Issue Date
2018-01
Citation
ACS Omega, 3(1), 361-368
Type
Article
Article Type
Article
Keywords
BatteriesFluoropolymers
ISSN
2470-1343
Abstract
In this study, we developed a doping technology capable of improving the electrochemical performance, including the rate capability and cycling stability, of P2-type Na0.67Fe0.5Mn0.5O2 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 Na0.67Fe0.5Mn0.5O2. The Ti-substituted Na0.67Fe0.5Mn0.5O2 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 NaO2 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. © 2018 American Chemical Society.
URI
http://hdl.handle.net/20.500.11750/5929
DOI
10.1021/acsomega.7b01481
Publisher
American Chemical Society
Related Researcher
  • Author Hong, Seung Tae Discovery Lab(Batteries & Materials Discovery Laboratory)
  • Research Interests Magnesium, sodium and lithium ion rechargeable batteries; New inorganic materials discovery; Solid state chemistry; Crystallography; Mg, Na, Li 이온 이차전지; 신 무기재료 합성; 고체화학; 결정화학
Files:
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Collection:
Department of Energy Science and EngineeringDiscovery Lab(Batteries & Materials Discovery Laboratory)1. Journal Articles


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