Achieving a superior Na storage performance of Fe‐based Prussian blue cathode by coating perylene tetracarboxylic dianhydride amine
Xin‐Yuan Fu,
Lu‐Lu Zhang,
Zhao‐Yao Chen,
Yunkai Xu,
Junxiu Wu,
Cheng‐Cheng Wang,
Xiao‐Kai Ding,
Xue‐Lin Yang,
Jun Lu
Affiliations
Xin‐Yuan Fu
Hubei Provincial Collaborative Innovation Center for New Energy Microgrid, College of Electrical Engineering & New Energy China Three Gorges University Yichang Hubei China
Lu‐Lu Zhang
Hubei Provincial Collaborative Innovation Center for New Energy Microgrid, College of Electrical Engineering & New Energy China Three Gorges University Yichang Hubei China
Zhao‐Yao Chen
College of Materials and Chemical Engineering China Three Gorges University Yichang Hubei China
Yunkai Xu
College of Chemical and Biological Engineering Zhejiang University Hangzhou China
Junxiu Wu
College of Chemical and Biological Engineering Zhejiang University Hangzhou China
Cheng‐Cheng Wang
Hubei Provincial Collaborative Innovation Center for New Energy Microgrid, College of Electrical Engineering & New Energy China Three Gorges University Yichang Hubei China
Xiao‐Kai Ding
Hubei Provincial Collaborative Innovation Center for New Energy Microgrid, College of Electrical Engineering & New Energy China Three Gorges University Yichang Hubei China
Xue‐Lin Yang
Hubei Provincial Collaborative Innovation Center for New Energy Microgrid, College of Electrical Engineering & New Energy China Three Gorges University Yichang Hubei China
Jun Lu
College of Chemical and Biological Engineering Zhejiang University Hangzhou China
Abstract Fe‐based Prussian blue (Fe‐PB) cathode material shows great application potential in sodium (Na)‐ion batteries due to its high theoretical capacity, long cycle life, low cost, and simple preparation process. However, the crystalline water and vacancies of Fe‐PB lattice, the low electrical conductivity, and the dissolution of metal ions lead to limited capacity and poor cycling stability. In this work, a perylene tetracarboxylic dianhydride amine (PTCDA) coating layer is successfully fabricated on the surface of Fe‐PB by a liquid‐phase method. The aminated PTCDA (PTCA) coating not only increases the specific surface area and electronic conductivity but also effectively reduces the crystalline water and vacancies, which avoids the erosion of Fe‐PB by electrolyte. Consequently, the PTCA layer reduces the charge transfer resistance, enhances the Na‐ion diffusion coefficient, and improves the structure stability. The PTCA‐coated Fe‐PB exhibits superior Na storage performance with a first discharge capacity of 145.2 mAh g−1 at 100 mA g−1. Long cycling tests exhibit minimal capacity decay of 0.027% per cycle over 1000 cycles at 1 A g−1. Therefore, this PTCA coating strategy has shown promising competence in enhancing the electrochemical performance of Fe‐PB, which can potentially serve as a universal electrode coating strategy for Na‐ion batteries.
