Improving Rate Performance by Inhibiting Jahn–Teller Effect in Mn-Based Phosphate Cathode for Na-Ion Batteries

Chen Sun, Qing Ni, Meng Li, Zheng Sun, Xuanyi Yuan, Lei Li*, Kuangyu Wang, Haibo Jin, Yongjie Zhao*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

29 Citations (Scopus)

Abstract

Manganese-based phosphate cathodes are promising candidates for developing advanced sodium-ion batteries, primarily driven by their reliable elemental abundance, low toxicity, and desirable cycling performance. However, the cooperative Jahn–Teller effect of Mn3+ will inevitably lead to structural disorder and irreversible phase transition, thus greatly harming the reversible capacity, rate, and cycling performance. Herein, a stable NASICON-type Na3MnHf(PO4)3 cathode is demonstrated with a volume variation of 1.9% upon the process of Na+ extraction/insertion based on the robust Hf─O bond and symmetrical MnO6 octahedron. Moreover, making full use of the stepwise redox reactions of Mn2+/Mn3+/Mn4+, this cathode reveals excellent cycling stability with a capacity retention of 85.4% after 2500 cycles at 10 C. Matching with commercial hard carbon anodes, the assembled full cell keeps a capacity retention of 92.1% with the Coulombic efficiency close to 100% after 600 cycles at 1 C. The research promises opportunities for the structural amelioration of manganese-based phosphate cathodes toward the application in high-performance sodium-ion batteries.

Original languageEnglish
Article number2310248
JournalAdvanced Functional Materials
Volume34
Issue number7
DOIs
Publication statusPublished - 12 Feb 2024

Keywords

  • Jahn-Teller effect
  • Mn-based redox reaction
  • NASICON-type cathodes
  • NaMnHf(PO)

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Sun, C., Ni, Q., Li, M., Sun, Z., Yuan, X., Li, L., Wang, K., Jin, H., & Zhao, Y. (2024). Improving Rate Performance by Inhibiting Jahn–Teller Effect in Mn-Based Phosphate Cathode for Na-Ion Batteries. Advanced Functional Materials, 34(7), Article 2310248. https://doi.org/10.1002/adfm.202310248