Electrochemical investigations of Na0.7CoO2 cathode with PEO-NaTFSI-BMIMTFSI electrolyte as promising material for Na-rechargeable battery

We report herein the development of a sodium polymer battery consisting of solid polymer electrolyte (SPE) system (polymer + ionic liquid and salt) as an electrolyte and sodium cobalt oxide as cathode material. Solid polymeric membranes (SPMs) were synthesized using polymer polyethyleneoxide (PEO),...

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Bibliographic Details
Published in:Journal of solid state electrochemistry 2018-06, Vol.22 (6), p.1909-1919
Main Authors: Singh, Varun Kumar, Singh, Shishir Kumar, Gupta, Himani, Shalu, Balo, Liton, Tripathi, Alok Kumar, Verma, Yogendra Lal, Singh, Rajendra Kumar
Format: Article
Language:English
Subjects:
Analytical Chemistry
Batteries
Cathodes
Characterization and Evaluation of Materials
Chemical synthesis
Chemistry
Chemistry and Materials Science
Cobalt oxides
Condensed Matter Physics
Differential scanning calorimetry
Electrochemical impedance spectroscopy
Electrochemical potential
Electrochemistry
Electrode materials
Electrolytes
Energy Storage
Ion currents
Ionic liquids
Ions
Membranes
Original Paper
Physical Chemistry
Polymers
Rechargeable batteries
Sodium
Thermal analysis
Thermal stability
Thermogravimetric analysis
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Summary:We report herein the development of a sodium polymer battery consisting of solid polymer electrolyte (SPE) system (polymer + ionic liquid and salt) as an electrolyte and sodium cobalt oxide as cathode material. Solid polymeric membranes (SPMs) were synthesized using polymer polyethyleneoxide (PEO), ionic liquid 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (BMIMTFSI) (10–40 wt.%), and sodium bis(trifluoromethylsulfonyl)imide (NaTFSI) salt. Na 0.7 CoO 2 cathode material was prepared using solid-state reaction route. These solid polymeric membranes were optimized using various experimental techniques such as thermogravimetric analysis, differential scanning calorimetry, and electrochemical impedance spectroscopy (EIS). It was found that the membrane containing 40 wt.% of IL has high room temperature (~ 30 °C), ionic conductivity (~ 4.1 × 10 −4  S cm −1 ), Na + transference number (~ 0.39), and good thermal stability. The optimized polymeric membrane shows high electrochemical potential window (~ 3.6 V) vs. Na/Na + , a specific discharge capacity of ~ 138 mAhg −1 (at 0.1 C rate) and maximum coulombic efficiency (~ 99%) for the prepared cell Na | SPE | Na 0.7 CoO 2 . Thus, the membrane containing 40 wt.% IL polymer electrolyte and Na 0.7 CoO 2 as cathode is promising material for the formation of sodium rechargeable battery.
ISSN:1432-8488
1433-0768
DOI:10.1007/s10008-018-3891-5