Ternary Ni-based Prussian blue analogue with superior sodium storage performance induced by synergistic effect of Co and Fe
作者机构：Hubei Provincial Collaborative Innovation Center for New Energy MicrogridCollege of Electrical Engineering&New EnergyChina Three Gorges UniversityYichangHubeiChina College of Materials and Chemical EngineeringChina Three Gorges UniversityYichangHubeiChina Hubei Gaobo Technology Inc.JingzhouHubeiChina
出 版 物：《Carbon Energy》 (碳能源（英文）)
年 卷 期：2021年第3卷第5期
页 面：827-839页
核心收录：
学科分类：0830[工学-环境科学与工程（可授工学、理学、农学学位）] 07[理学] 0807[工学-动力工程及工程热物理] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学] 070202[理学-粒子物理与原子核物理] 0702[理学-物理学]
基 金：National Natural Science Foundation of China,Grant/Award Number:52072217,51802261,51772169 National Key R&D Program of China,Grant/Award Number:2018YFB0905400 Major Technological Innovation Project of Hubei Science and Technology Department,Grant/Award Number:2019AAA164。
主 题：cathode materials doping Prussian blue analogue sodium-ion batteries synergistic effect
摘 要：Prussian blue analogue Na2Ni[Fe(CN)6](Ni-PB)has been widely studied as a cathode material for sodium-ion battery due to its excellent cycling performance.However,Ni-PB has a low theoretical capacity of 85 mAh g^(−1) because of the electrochemical inertness of Ni.Herein,ternary Ni-PB is successfully synthesized by double doping with Co and Fe at Ni-site,and the effect of doping with Co and Fe on the electrochemical performance of Ni-PB is systematically investigated through theoretical calculations and electrochemical tests.The first principles calculations confirm that double doping with Co and Fe can significantly reduce the energy barrier and bandgap of Ni-PB.X-ray diffraction and composition analysis results indicate that ternary NiCoFe-PB composite not only has good crystallinity and high Na content but also has low defects and crystal water.Electrochemical tests reveal that,besides the capacity contribution of high-spin Co/Fe and low-spin Fe,Co-doping enhances the electrochemical activity of low-spin Fe and Fe-doping improves the activity of high-spin Co;moreover,double doping can decrease the diffusion resistance of Na+ions through solid electrolyte interface film,accelerate the kinetics for both ion diffusion process and Faradic reaction,and increase active sites.Under the synergistic effect of Co and Fe,this ternary NiCoFe-PB exhibits outstanding electrochemical performance with a high initial discharge capacity of 120.4 mAh g^(−1) at 20mA g^(−1) and an extremely low capacity fading rate of 0.0044%per cycle at a high current density of 2 A g^(−1) even after 10,000 cycles,showing great application potential of ternary NiCoFe-PB in the field of large-scale energy storage.
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