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

By P. Barpanda, Tiannan Ye, Shin-ichi Nishimura, Shinka Nishimura, Sai-Cheong Chung, Yuki Yamada, M. Okubo, Haoshen Zhou, Atsuo Yamada. 2012

322 citations recorded by the source corpus.

Abstract Extending the pyrophosphate chemistry for rechargeable Na-ion batteries, here we report the synthesis and electrochemical characterization of Na2FeP2O7, a novel Fe-based cathode material for sodium batteries. Prepared by conventional solid-state as well as solution-combustion synthesis (at 600 °C), the Na2FeP2O7 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 Na2FeP2O7 cathode was found to be electrochemically active, delivering a reversible capacity of 82 mAh·g− 1 with the Fe3 +/Fe2 + redox potential centered around 3 V (vs. Na/Na+). With its theoretical capacity of ~ 100 mAh·g− 1 and potential high rate-capability, Na2FeP2O7 forms a promising novel cathode material, with the distinction of being the first ever pyrophosphate-class of cathode for sodium-ion batteries.

Subfields: Electrical and Electronic Engineering, Electronic, Optical and Magnetic Materials

View Paper: https://www.semanticscholar.org/paper/a39eca3aa51c19662f8537db4059b6c44b0bfddb