首页|Low-S train and High-Energy KVPO4F Cathode with Multifunctional Stabilizer for Advanced Potassium-Ion Batteries
Low-S train and High-Energy KVPO4F Cathode with Multifunctional Stabilizer for Advanced Potassium-Ion Batteries
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KVPO4F with excellent structural stability and high operating voltage has been identified as a promising cathode for potassium-ion batteries(PIBs),but limits in sluggish ion transport and severe volume change cause insufficient potassium storage capability.Here,a high-energy and low-strain KVPO4F composite cathode assisted by multifunctional K2C4O4 electrode stabilizer is exquisitely designed.Systematical electrochemical investigations demonstrate that this composite cathode can deliver a remarkable energy density up to 530 Wh kg-1 with 142.7 mAh g-1 of reversible capacity at 25 mA g-1,outstanding rate capability of 70.6 mAh g-1 at 1000 mA g-1,and decent cycling stability.Furthermore,slight volume change(～5％)and increased interfacial stability with thin and even cathode-electrolyte interphase can be observed through in situ and ex situ characterizations,which are attributed to the synergistic effect from in situ potassium compensation and carbon deposition through self-sacrificing K2C4O4 additive.Moreover,potassium-ion full cells manifest significant improvement in energy density and cycling stability.This work demonstrates a positive impact of K2C4O4 additive on the comprehensive electrochemical enhancement,especially the activation of high-voltage plateau capacity and provides an efficient strategy to enlighten the design of other high-voltage cathodes for advanced high-energy batteries.
high energy densityK2C4O4KVPO4F composite cathodelow strainpotassium-ion batteries
MOE Key Laboratory for UV Light-Emitting Materials and Technology,Northeast Normal University,Changchun 130024,China
Key Laboratory of Organo-Pharmaceutical Chemistry of Jiangxi Province,Gannan Normal University,Ganzhou 341000,China
Department of Chemistry,Northeast Normal University,Changchun 130024,China
National Key R&D Program of ChinaNational Natural Science Foundation of ChinaNatural Science Foundation of Jilin ProvinceDouble-Thousand Talents Plan of Jiangxi Province
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