Sodium iron pyrophosphate: A novel 3.0 v iron-based cathode for sodium-ion batteries

Prabeer Barpanda, Tian Ye, Shin Ichi Nishimura, Sai Cheong Chung, Yuki Yamada, Masashi Okubo, Haoshen Zhou, Atsuo Yamada*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

284 Citations (Scopus)


Extending the pyrophosphate chemistry for rechargeable Na-ion batteries, here we report the synthesis and electrochemical characterization of Na 2FeP 2O 7, a novel Fe-based cathode material for sodium batteries. Prepared by conventional solid-state as well as solution-combustion synthesis (at 600 °C), the Na 2FeP 2O 7 adopts a triclinic structure (space group: P-1) with three-dimensional channels running along [100], [- 110] and [01-1] directions. With no further optimization, the as-synthesized Na 2FeP 2O 7 cathode was found to be electrochemically active, delivering a reversible capacity of 82 mAh·g - 1 with the Fe 3 +/Fe 2 + redox potential centered around 3 V (vs. Na/Na +). With its theoretical capacity of ~ 100 mAh·g - 1 and potential high rate-capability, Na 2FeP 2O 7 forms a promising novel cathode material, with the distinction of being the first ever pyrophosphate-class of cathode for sodium-ion batteries.

Original languageEnglish
Pages (from-to)116-119
Number of pages4
JournalElectrochemistry Communications
Issue number1
Publication statusPublished - 2012 Oct
Externally publishedYes


  • Cathode
  • Na FeP O
  • Na-ion batteries
  • Pyrophosphate

ASJC Scopus subject areas

  • Electrochemistry


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