Expanded K<sub>0.37</sub>Fe<sub>0.04</sub>Al<sub>0.07</sub>Mn<sub>0.89</sub>O<sub>2</sub> 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
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.
