Na4Fe3(PO4)2(P2O7)/C composite with porous structure enabling all climate and long-life sodium-ion batteries

Xiaoyan Shi, Zhiqiang Hao, Wenqing Zhu, Xunzhu Zhou, Xiaomin Chen, Chenchen Wang, Lin Li*, Robert Armstrong, Shu-Lei Chou*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Na4Fe3(PO4)2(P2O7) (NFPP) with the advantages
of low cost and stable crystal structure has been
considered a highly promising cathode candidate for sodiumion
batteries. However, limited by its undesirable intrinsic
conductivity, it still suffers from unsatisfactory electrochemical
performance. Herein, we synthesized NFPP/C composites
with porous structure (p-NFPP) by a facile selfassembly
strategy. Its well-developed pore structure can effectively
reduce the ion diffusion path, accelerate electrolyte
infiltration and accommodate volume expansion during the
charge/discharge process. In addition, in-situ X-ray diffraction
revealed the superior structural stability of p-NFPP. They
enable a high reversible capacity (104.8 mAh g−1), and good
rate performance (75.0 mAh g−1 at 10 A g−1), and excellent
cycling stability (a reversible capacity of 85.1 mAh g−1 after
2000 cycles). More importantly, the p-NFPP realizes a stable
operation in a wide temperature range of 55°C to −10°C. This
work highlights morphology engineering as a powerful strategy
to boost the all-climate sodium storage performance of
electrode materials.
Original languageEnglish
JournalScience China Materials
DOIs
Publication statusPublished - 23 Aug 2024

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