Expanded K 0.37 Fe 0.04 Al 0.07 Mn 0.89 O 2 Layered Material as a High-Performance Cathode in Sodium-Ion Batteries

Pan Ning, Xinbin Mao, Li Zhou, Hongrui Wang, Feng Zhang, Congshan Zhou, Bei Long, Yuping Wu and Xiongwei Wu
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Pan Ning: College of Chemistry and Chemical Engineering, Hunan Institute of Science and Technology, Yueyang 414006, China
Xinbin Mao: College of Chemistry and Chemical Engineering, Hunan Institute of Science and Technology, Yueyang 414006, China
Li Zhou: College of Chemistry and Chemical Engineering, Hunan Institute of Science and Technology, Yueyang 414006, China
Hongrui Wang: School of Chemistry and Materials Science, Hunan Agricultural University, Changsha 410128, China
Feng Zhang: School of Chemistry and Materials Science, Hunan Agricultural University, Changsha 410128, China
Congshan Zhou: College of Chemistry and Chemical Engineering, Hunan Institute of Science and Technology, Yueyang 414006, China
Bei Long: School of Chemistry, Xiangtan University, Xiangtan 411105, China
Yuping Wu: School of Energy and Environment, Southeast University, Nanjing 211189, China
Xiongwei Wu: School of Chemistry and Materials Science, Hunan Agricultural University, Changsha 410128, China

Energies, 2022, vol. 15, issue 15, 1-7

Abstract: Due to a high operating voltage and theoretical capacity, P2-type layered Mn-based metal oxides are considered to be promising cathodes in sodium-ion batteries, but their poor structural stability in the process of Na + insertion/deinsertion severely hinders their practical application. Here, an interesting K + pre-intercalation is used to expand the interlayer distance and enhance the electrochemical reversibility of K s Fe x Al y Mn z O 2 . With a suitable K + content, the optimized electrode shows a high specific capacity of 135 mAh g −1 at 0.1 C, a good rate capability of 80 mAh g −1 at 5 C and an excellent cycling performance of 76.4% capacity retention after 200 cycles at a high rate of 5 C. This work proves the feasibility of a K + pre-intercalation strategy in a P2-type layered cathode.

Keywords: layered K 0.37 Fe 0.04 Al 0.07 Mn 0.89 O 2 cathode; expanded interlayer spacing; good structural stability; sol–gel method; sodium-ion batteries (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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