Rechargeable Na/Na0.44MnO2 cells with ionic liquid electrolytes containing various sodium solutes

Chueh Han Wang, Yu Wen Yeh, Nithinai Wongittharom, Yi Chen Wang, Chung Jen Tseng, Sheng Wei Lee, Wen Sheng Chang, Jeng-Kuei Chang*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

98 Scopus citations


Orthorhombic Na0.44MnO2 with wide structural tunnels for sodium ion transport is synthesized. Butylmethylpyrrolidinium-bis(trifluoromethanesulfonyl)imide (BMP-TFSI) ionic liquid (IL) with various Na solutes, namely NaBF4, NaClO4, NaTFSI, and NaPF6, is used as an electrolyte for rechargeable Na/Na0.44MnO2 cells. The cell with NaClO4-incorporated IL electrolyte exhibits superior charge-discharge performance due to it having the lowest solid-electrolyte-interface resistance and charge transfer resistance at both the Na and Na0.44MnO2 electrodes. The IL electrolyte shows high thermal stability and is suitable for use at an elevated temperature. At 75 °C, the measured capacity of Na0.44MnO2 in the IL electrolyte with NaClO4 is as high as 115 mAh g-1 (at 0.05 C), which is close to the theoretical value (121 mAh g-1). Moreover, 85% of this capacity can be retained when the charge-discharge rate is increased to 1 C. These properties are superior to those of a conventional organic electrolyte.

Original languageEnglish
Pages (from-to)1016-1023
Number of pages8
JournalJournal of Power Sources
StatePublished - 15 Jan 2015


  • Electrolyte
  • Ionic liquid
  • Na solute
  • Sodium battery
  • Temperature


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