Extending the solid solution range of sodium ferric pyrophosphate: Off‐stoichiometric Na3Fe2.5(P2O7)2 as a novel cathode for sodium‐ion batteries

• Published in: Carbon energy Vol. 6; no. 4
• Main Authors: Pu, Xiangjun, Yang, Kunran, Pan, Zibing, Song, Chunhua, Lai, Yangyang, Li, Renjie, Xu, Zheng‐Long, Chen, Zhongxue, Cao, Yuliang
• Format: Journal Article
• Language: English
• Published: Wiley 01.04.2024
• Subjects: extending solid‐solution range; off‐stoichiometric Na3Fe2.5(P2O7)2; sodium‐ion batteries; structure–function relationship

Iron‐based pyrophosphates are attractive cathodes for sodium‐ion batteries due to their large framework, cost‐effectiveness, and high energy density. However, the understanding of the crystal structure is scarce and only a limited candidates have been reported so far. In this work, we found for the...