Expanded K0.37Fe0.04Al0.07Mn0.89O2 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; Xiongwei Wu

doi:10.3390/en15155659

Energies (Aug 2022)

Expanded K0.37Fe0.04Al0.07Mn0.89O2 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,
Xiongwei Wu

Affiliations

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

DOI: https://doi.org/10.3390/en15155659
Journal volume & issue: Vol. 15, no. 15
p. 5659

Abstract

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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 KsFexAlyMnzO2. 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.

Published in Energies

ISSN: 1996-1073 (Online)
Publisher: MDPI AG
Country of publisher: Switzerland
LCC subjects: Technology
Website: http://www.mdpi.com/journal/energies

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