Evaluation of electrochemical performance and redox activity of Fe in Ti doped layered P2-Na0.67Mn0.5Fe0.5O2 cathode for sodium ion batteries

Devendrasinh Darbar; Nitin Muralidharan; Raphaël P. Hermann; Jagjit Nanda; Indranil Bhattacharya

doi:10.1016/j.electacta.2021.138156

Evaluation of electrochemical performance and redox activity of Fe in Ti doped layered P2-Na_0.67Mn_0.5Fe_0.5O₂ cathode for sodium ion batteries

Devendrasinh Darbar, Nitin Muralidharan, Raphaël P. Hermann, Jagjit Nanda, Indranil Bhattacharya

Neutron & X-Ray Scattering, & Thermophys

Research output: Contribution to journal › Article › peer-review

29 Scopus citations

Abstract

Here, we report a wet synthesis-based titanium doping strategy to improve the structural stability and electrochemical performances, such as cycling stability and rate capability, of P2-type Na_0.67Fe_0.5Mn_0.5O₂ layered oxide cathodes. Through Ti⁴⁺ doping aimed at replacing some of the Mn and Fe atoms in the crystal structure, effective mitigation of the Jahn Teller distortion caused by active Mn³⁺ before charging and Fe⁴⁺ after charging was achieved. X-ray diffraction (XRD), Raman spectroscopy, Electrochemical Impedance Spectroscopy (EIS) and Mössbauer spectroscopy were used to investigate the effects of the Ti⁴⁺ dopant before and after cycling. It was observed that Ti⁴⁺ doping increased the Na layer thickness, minimized the lattice volume strain, showed better structural stability, minimally decreased Fe migration to the Na layer, and lowered charge transfer resistance in these P2-type cathodes. Overall, our reported synthesis methodology and electrochemical characterizations highlight the feasibility of Ti doping in sodium layered oxide P2-type cathodes.

Original language	English
Article number	138156
Journal	Electrochimica Acta
Volume	380
DOIs	https://doi.org/10.1016/j.electacta.2021.138156
State	Published - Jun 1 2021

Funding

The material synthesis is been carried out at SOLBAT-TTU Energy Research Laboratory, Tennessee Technological University. The major physical and electrochemical characterization were performed at Oak Ridge National Laboratory, Oak Ridge Tennessee. Mössbauer characterization work was sponsored by funding from the US Department of Energy - Energy Efficiency and Renewable Energy (EERE), Vehicle Technologies Office (VTO). Jagjit Nanda is supported by Energy Storage Program, Office of Electricity-Department of Energy. The project was funded by Tennessee Valley Authority (TVA) under the grant # 5315627 . Ex-situ X-ray diffraction were conducted at the Center for Nanophase Materials Sciences, which is a DOE Office of Science User Facility.

Keywords

Jahn Teller distortion
P2-type layered cathode
Sodiation/de-sodiation
Sodium batteries
Ti doping

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Access to Document

10.1016/j.electacta.2021.138156

Cite this

@article{9788970c0d7c47a485952198192c8e60,

title = "Evaluation of electrochemical performance and redox activity of Fe in Ti doped layered P2-Na0.67Mn0.5Fe0.5O2 cathode for sodium ion batteries",

abstract = "Here, we report a wet synthesis-based titanium doping strategy to improve the structural stability and electrochemical performances, such as cycling stability and rate capability, of P2-type Na0.67Fe0.5Mn0.5O2 layered oxide cathodes. Through Ti4+ doping aimed at replacing some of the Mn and Fe atoms in the crystal structure, effective mitigation of the Jahn Teller distortion caused by active Mn3+ before charging and Fe4+ after charging was achieved. X-ray diffraction (XRD), Raman spectroscopy, Electrochemical Impedance Spectroscopy (EIS) and M{\"o}ssbauer spectroscopy were used to investigate the effects of the Ti4+ dopant before and after cycling. It was observed that Ti4+ doping increased the Na layer thickness, minimized the lattice volume strain, showed better structural stability, minimally decreased Fe migration to the Na layer, and lowered charge transfer resistance in these P2-type cathodes. Overall, our reported synthesis methodology and electrochemical characterizations highlight the feasibility of Ti doping in sodium layered oxide P2-type cathodes.",

keywords = "Jahn Teller distortion, P2-type layered cathode, Sodiation/de-sodiation, Sodium batteries, Ti doping",

author = "Devendrasinh Darbar and Nitin Muralidharan and Hermann, {Rapha{\"e}l P.} and Jagjit Nanda and Indranil Bhattacharya",

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doi = "10.1016/j.electacta.2021.138156",

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T1 - Evaluation of electrochemical performance and redox activity of Fe in Ti doped layered P2-Na0.67Mn0.5Fe0.5O2 cathode for sodium ion batteries

AU - Darbar, Devendrasinh

AU - Muralidharan, Nitin

AU - Hermann, Raphaël P.

AU - Nanda, Jagjit

AU - Bhattacharya, Indranil

PY - 2021/6/1

Y1 - 2021/6/1

N2 - Here, we report a wet synthesis-based titanium doping strategy to improve the structural stability and electrochemical performances, such as cycling stability and rate capability, of P2-type Na0.67Fe0.5Mn0.5O2 layered oxide cathodes. Through Ti4+ doping aimed at replacing some of the Mn and Fe atoms in the crystal structure, effective mitigation of the Jahn Teller distortion caused by active Mn3+ before charging and Fe4+ after charging was achieved. X-ray diffraction (XRD), Raman spectroscopy, Electrochemical Impedance Spectroscopy (EIS) and Mössbauer spectroscopy were used to investigate the effects of the Ti4+ dopant before and after cycling. It was observed that Ti4+ doping increased the Na layer thickness, minimized the lattice volume strain, showed better structural stability, minimally decreased Fe migration to the Na layer, and lowered charge transfer resistance in these P2-type cathodes. Overall, our reported synthesis methodology and electrochemical characterizations highlight the feasibility of Ti doping in sodium layered oxide P2-type cathodes.

AB - Here, we report a wet synthesis-based titanium doping strategy to improve the structural stability and electrochemical performances, such as cycling stability and rate capability, of P2-type Na0.67Fe0.5Mn0.5O2 layered oxide cathodes. Through Ti4+ doping aimed at replacing some of the Mn and Fe atoms in the crystal structure, effective mitigation of the Jahn Teller distortion caused by active Mn3+ before charging and Fe4+ after charging was achieved. X-ray diffraction (XRD), Raman spectroscopy, Electrochemical Impedance Spectroscopy (EIS) and Mössbauer spectroscopy were used to investigate the effects of the Ti4+ dopant before and after cycling. It was observed that Ti4+ doping increased the Na layer thickness, minimized the lattice volume strain, showed better structural stability, minimally decreased Fe migration to the Na layer, and lowered charge transfer resistance in these P2-type cathodes. Overall, our reported synthesis methodology and electrochemical characterizations highlight the feasibility of Ti doping in sodium layered oxide P2-type cathodes.

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