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2025 Vol.35, Issue 7 Preview Page

Research Paper

Enhanced Electrochemical Properties of NaFe2PO4(SO4)2 via Co2+ Doping as Cathode Material for Sodium-ion Batteries
Yao Liu1*
,
Yilei Sun1*
,
Haixia Wang2
,
Zeda Meng1†
,
Won-Chun Oh3†
1School of Chemistry and Life Sciences, Suzhou University of Science and Technology, Suzhou 215009, China
2Applied Technology College of Soochow University, Suzhou 215009, China
3Department of Advanced Materials Science and Engineering, Hanseo University, Seosan 31962, Republic of Korea
†Corresponding author E-Mail : compelitely@163.com (Z. Meng, SUST), wc_oh@hanseo.ac.kr (W.-C. Oh, Hanseo Univ.)
*These two authors are equally contributed as first authors.
27 July 2025. pp. 266-276
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Abstract

Sodium-ion batteries (SIBs) offer a viable alternative to partially or fully replace lithium ion batteries (LIBs) due to their lower cost and increased safety. This paper outlines the compositional optimizations, crystallographic evaluations, and electrochemical behavior of a novel mixed NASICON polyanionic compound, NaFe2PO4(SO4)2 (NFPS). X-ray photoelectron spectrometry (XPS) results showed that cobalt doping produces a higher concentration of oxygen defects compared to undoped samples. Scanning electron microscopy (SEM) analysis results revealed that the modified sample has more uniform pores and pore distribution. Brunauer-Emmett-Teller (BET) measurements showed that doping of Co2+ reduces the specific surface area of NFPS-Co0.08 compared to NFPS. This shortens the sodium ion diffusion pathway and promotes ion dynamics. The addition of Co2+ to the sample significantly improved its performance during galvanostatic charge-discharge tests. The electrochemical activity also is significantly enhanced by Co2+ doping. Na0.84Co0.08Fe2PO4(SO4)2 exhibits superior rate and cycling performance compared to pristine NFPS. After 80 cycles at 25 mA g-1, NFPS-Co0.08 retained discharge specific capacity of 60.8 mA h g-1, which is 1.24 times greater than that of NFPS.

Keywords
vacancy oxygen
NaFe2PO4(SO4)2
Na-super-ionic conductor
sodium-ion batteries
Co2+ doping
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Information
  • Publisher :Materials Research Society of Korea
  • Publisher(Ko) :한국재료학회
  • Journal Title :Korean Journal of Materials Research
  • Journal Title(Ko) :한국재료학회지
  • Volume : 35
  • No :7
  • Pages :266-276
  • Received Date : 2025-04-11
  • Revised Date : 2025-06-12
  • Accepted Date : 2025-06-18
  • DOI :https://doi.org/10.3740/MRSK.2025.35.7.266
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