Journal of Solid State Electrochemistry

, Volume 23, Issue 11, pp 3135–3143 | Cite as

KFeO2 with corner-shared FeO4 frameworks as a new type of cathode material in potassium-ion batteries

  • Su Cheol Han
  • Woon Bae Park
  • Kee-Sun SohnEmail author
  • Myoungho PyoEmail author
Original Paper


KFeO2 is presented as a new type of cathode material for potassium-ion batteries. In contrast to LiFeO2 and NaFeO2, KFeO2 has tetrahedrally coordinated Fe3+ ions linked by three-dimensional corner-sharing. When chemically oxidized, KFeO2 releases ca. 0.3 K+ (K0.7FeO2) and shows no apparent changes in X-ray diffraction patterns. Rietveld refinement of KFeO2 and K0.7FeO2 reveals negligible variation in the unit cell dimension and in the basic structure, but noticeable differences in FeO4 volumes and inter-tetrahedra angles due to the Jahn-Teller active Fe4+ (eg2t2g2) in K0.7FeO2. The refinement also shows no preferential extraction of K+ from two possible sites (K1 and K2), which coincides with the results from density-functional-theory calculation. In accordance with the compositional and structural analysis, KFeO2 delivers a reversible capacity of 60 mAh g−1 (ca. 0.28 K+) during the initial charge/discharge (C/D), showing a plateau-like voltage response at 3.43 V vs. K/K+. In-operando diffraction studies also show no distinctive signs of pattern evolution, which is likely due to the structural similarities of KFeO2 and K0.7FeO2. With repeated cycling, however, the reversible capacity of KFeO2 continuously decreases and falls to 30 mAh g−1 after 50 C/D cycles. The repeated changes in the FeO4 tetrahedra geometry appear to cause a decrease in the crystallinity of KFeO2, which eventually aggravates the facile K+ transport. The results of this study show that the practicality of KFeO2 can be realized via improvements of cyclability by mitigating the Jahn-Teller effect (for example, isovalent doping with Al3+or Ga3+).


Potassium-ion batteries KFeO2 Cathode Density functional theory 


Funding information

This research was supported by the Creative Materials Discovery Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT and Future (2015M3D1A1069710). This research was also partially supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (NRF-2014R1A6A1030419).


  1. 1.
    He P, Yu H, Li D, Zhou H (2012) Layered lithium transition metal oxide cathodes towards high energy lithium-ion batteries. J Mater Chem 22:3680–3695CrossRefGoogle Scholar
  2. 2.
    Wang PF, You Y, Yin YX, Guo YG (2018) Layered oxide cathodes for sodium-ion batteries: phase transition, air stability, and performance. Adv Energy Mater 8(8):1701912Google Scholar
  3. 3.
    Su H, Jaffer S, Yu H (2016) Transition metal oxides for sodium-ion batteries. Energy Storage Mater 5:116–131CrossRefGoogle Scholar
  4. 4.
    Yabuuchi N, Komaba S (2014) Recent research progress on iron- and manganese-based positive electrode materials for rechargeable sodium batteries. Sci Technol Adv Mater 15:043501CrossRefGoogle Scholar
  5. 5.
    Kraytsberg A, Ein-Eli Y (2012) Higher, stronger, better… a review of 5 volt cathode materials for advanced lithium-ion batteries. Adv Energy Mater 2(8):922–939CrossRefGoogle Scholar
  6. 6.
    Kim H, Seo DH, Urban A, Lee J, Kwon DH, Bo SH, Shi T, Papp JK, McCloskey BD, Ceder G (2018) Stoichiometric layered potassium transition metal oxide for rechargeable potassium batteries. Chem Mater 30(18):6532–6539CrossRefGoogle Scholar
  7. 7.
    Kubota K, Dahbi M, Hosaka T, Kumakura S, Komaba S (2018) Towards K-ion and Na-ion batteries as “beyond Li-ion”. Chem Rec 18(4):1–22CrossRefGoogle Scholar
  8. 8.
    Komaba S, Hasegawa T, Dahbi M, Kubota K (2015) Potassium intercalation into graphite to realize high-voltage/high-power potassium-ion batteries and potassium-ion capacitors. Electrochem Commun 60:172–175CrossRefGoogle Scholar
  9. 9.
    Luo W, Wan J, Ozdemir B, Bao W, Chen Y, Dai J, Lin H, Xu Y, Gu F, Barone V, Hu L (2015) Potassium ion batteries with graphitic materials. Nano Lett 15(11):7671–7677CrossRefGoogle Scholar
  10. 10.
    Vaalma C, Giffin GA, Buchholz D, Passerini S (2016) Non-aqueous K-ion battery based on layered K0.3MnO2 and hard carbon/carbon black. J Electrochem Soc 163(7):A1295–A1299CrossRefGoogle Scholar
  11. 11.
    Kim H, Seo DH, Kim JC, Bo SH, Liu L, Shi L, Ceder G (2017) Investigation of potassium storage in layered P3-type K0.5MnO2 cathode. Adv Mater 29(37):1702480CrossRefGoogle Scholar
  12. 12.
    Wang X, Xu X, Niu C, Meng J, Huang M, Liu X, Liu Z, Mai L (2017) Earth abundant Fe/Mn-based layered oxide interconnected nanowires for advanced K-ion full batteries. Nano Lett 17(1):544–550CrossRefGoogle Scholar
  13. 13.
    Liu C, Luo S, Huang H, Wang Z, Hao A, Zhai Y, Wang Z (2017) K0.67Ni0.17Co0.17Mn0.66O2: a cathode material for potassium-ion battery. Electrochem Commun 82:150–154CrossRefGoogle Scholar
  14. 14.
    Hironaka Y, Kubotaab K, Komaba S (2017) P2- and P3-KxCoO2 as an electrochemical potassium intercalation host. Chem Commun 53:3693–3696CrossRefGoogle Scholar
  15. 15.
    Kim H, Kim JC, Bo SH, Shi T, Kwon DH, Ceder G (2017) K-ion batteries based on a P2-type K0.6CoO2 cathode. Adv Energy Mater 7(17):1700098CrossRefGoogle Scholar
  16. 16.
    Naveen N, Park WB, Han SC, Singh SP, Jung YH, Ahn D, Sohn KS, Pyo M (2018) Reversible K+-insertion/deinsertion and concomitant Na+-redistribution in P′3-Na0.52CrO2 for high-performance potassium-ion battery cathodes. Chem Mater 30(6):2049–2057CrossRefGoogle Scholar
  17. 17.
    Hwang JY, Kim J, Yu TY, Myung ST, Sun YK (2018) Development of P3-K0.69CrO2 as an ultra-high-performance cathode material for K-ion batteries. Energy Environ Sci 11(10):2821–2827CrossRefGoogle Scholar
  18. 18.
    Naveen N, Han SC, Singh SP, Ahn D, Sohn KS, Pyo M (2019) Highly stable P’3-K0.8CrO2 cathode with limited dimensional changes for potassium ion batteries. J Power Sources 430:137–144CrossRefGoogle Scholar
  19. 19.
    Naveen N, Park WB, Singh SP, Han SC, Ahn D, Sohn KS, Pyo M (2018) KCrS2 cathode with considerable cyclability and high rate performance: the first K+ stoichiometric layered compound for potassium-ion batteries. Small 14(49):1803495CrossRefGoogle Scholar
  20. 20.
    Tomkowicz Z, Szytula A (1977) Crystal and magnetic structure of KFeO2. J Phys Chem Solids 38(10):1117–1123CrossRefGoogle Scholar
  21. 21.
    Proskurnina N, Voronin VI, Shekhtman GS, Maskaeva LN, Kabanova NA, Kabanov AA, Blatov VA (2017) Ionic conductivity in Ti-doped KFeO2: experiment and mathematical modeling. J Phys Chem C 121(39):21128–21135CrossRefGoogle Scholar
  22. 22.
    Voronin VI, Shekhtman GS, Blatov VA (2012) The natural tiling approach to cation conductivity in KAlO2 polymorphs. Acta Cryst B68:356–363CrossRefGoogle Scholar
  23. 23.
    Peskov MV, Schwingenschlögl U (2015)First-principles determination of the K-conductivity pathways in KAlO2. J Phys Chem C 119(17):9092–9098CrossRefGoogle Scholar
  24. 24.
    Perdew JP, Burke K, Ernzerhof M (1996) Generalized gradient approximation made simple. Phys Rev Lett 77(18):3865–3868CrossRefGoogle Scholar
  25. 25.
    Kresse G, Hafner J (1993) Ab initio molecular dynamics for liquid metals. Phys Rev B: Condens Matter Mater Phys 47(1):558–561CrossRefGoogle Scholar
  26. 26.
    Kresse G, Hafner J (1996) Efficient iterative schemes for ab initio total-energy calculations using a plane-wave basis set. Phys Rev B: Condens Matter Mater Phys 54(16):11169–11186CrossRefGoogle Scholar
  27. 27.
    Blochl PE (1994) Projector augmented-wave method. Phys Rev B: Condens Matter Mater Phys 50(24):17953–17979CrossRefGoogle Scholar
  28. 28.
    Kresse G, Joubert D (1999) From ultrasoft pseudopotentials to the projector augmented-wave method. Phys Rev B: Condens Matter Mater Phys 59(3):1758–1775CrossRefGoogle Scholar
  29. 29.
    Monkhorst HJ, Pack JD (1976) Special points for Brillouin-zone integrations. Phys Rev B: Condens Matter Mater Phys 13(12):5188–5192CrossRefGoogle Scholar
  30. 30.
    Voronin VI, Blatov VA, Shekhtman GS (2013) Specific features of the crystal structure of polymorphous modifications of KFeO2 and their correlation with ionic conductivity. Phys Solid State 55(5):1050–1056CrossRefGoogle Scholar

Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Department of Printed Electronics EngineeringSunchon National UniversitySunchonRepublic of Korea
  2. 2.Faculty of Nanotechnology and Advanced Materials EngineeringSejong UniversitySeoulRepublic of Korea

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