• DOI:10.1149/2.0121506JES
• Corpus ID: 95052486

Relating Electrolyte Concentration to Performance and Stability for NaTi2(PO4)3/Na0.44MnO2 Aqueous Sodium-Ion Batteries

@article{Wu2015RelatingEC,
  title={Relating Electrolyte Concentration to Performance and Stability for NaTi2(PO4)3/Na0.44MnO2 Aqueous Sodium-Ion Batteries},
  author={Wei Wu and Sneha Shabhag and Jiang Chang and Ann Rutt and Jay F. Whitacre},
  journal={Journal of The Electrochemical Society},
  year={2015},
  volume={162}
}

• Wei Wu, S. Shabhag, +2 authors J. Whitacre
• Published 2015
• Materials Science
• Journal of The Electrochemical Society

In aqueous electrolyte batteries, the salt concentration of the electrolyte affects the ionic conductivity, which will further affect the rate performance of the battery as well as the diffusion of reactive species that can cause self-discharge, particularly in thick electrode devices. To this end, we explored the implications of device performance using Na 0.44 MnO 2 cathode material, NaTi 2 (PO 4 ) 3 , anode material in a NaClO 4 -based aqueoussolutions with molarities as highas 5. Experimentsincluded physical property characterizations, cyclicvoltammetry,andconstantcurrentcharging/dischargingmethods.Preliminaryresultsindicatethat,incellswiththickelectrodes( ∼ 1mm), rate capability and electrode utilization increased significantly with higher molarity solutions: capacity at the 1.5 C rate increased 38% by increasing the salt concentration from 1 M to 5 M. At the same time the oxygen-related self-discharge phenomenon was diminished when using higher electrolyte molarities, though there was still measurable loss in capacity in in the electrodes. Irreversible capacity loss was observed to occur even in electrolytes with the lowest oxygen content, suggesting that self discharge and capacity loss are not necessarily causally related.