首页|Cesium-doped manganese-based Prussian blue analogue as a high-efficiency cathode material for potassium-ion batteries
Cesium-doped manganese-based Prussian blue analogue as a high-efficiency cathode material for potassium-ion batteries
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Prussian blue analogues(PBAs)are regarded as promising cathode materials for potassium-ion batteries(PIBs)owing to their low cost and high reversible capacity.Compared to other PBAs,potassium manganese hexacyanoferrate(KMnHCF)stands out for its superior capacity and operating voltage.However,Jahn-Teller effect of Mn3+and the structural collapse caused by potassium ion insertion/extraction still affect the structural stability and electrochemical performance of this material.Herein,a green and efficient synthesis method is adopted to substitute potassium ions in KMnHCF with an appro-priate amount of cesium ions to form a column effect.Cesium-doped KMnHCF(Cs-KMnHCF)mitigates the irreversible structural damage caused by potassiation/depotassiation and the Jahn-Teller effect,thereby improving the cycling stability.In addition,it widens the lattice channels,reduces the diffusion barrier of potassium ions,and optimizes the diffusion kinetics.By rationally controlling the doping amount of Cs+,the obtained K1.71Cs0.0sMn[Fe(CN)6]0.95-0.05·0.88H2O exhibits remarkable electrochemical performance,with an initial discharge capacity of 137.6 mA h g-1 at a current density of 20 mA g-1 and a capacity retention of 89.6％after 600 cycles at 200 mA g-1.More importantly,when assembled with a pitch-derived soft carbon anode,the full cell manifests excellent cycle stability and rate performance.This work is expected to provide a highly efficient cathode material for the practical application of PIBs.
Prussian blue analogueCathode materialPotassium-ion batteryIon exchangeColumn effect
Jie Wang、Zeyu Yuan、Jiaying Liao、An Li、Yifan Xu、Haijie Qi、Yuehua Man、Yanqi Lv、Xiaosi Zhou
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School of Chemistry and Materials Science,Nanjing Normal University,Nanjing 210023,Jiangsu,China
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