【摘 要】
：
The potassium bis(fluoro-sulfonyl)imide(KFSI)-based electrolyte has great application prospects in potas-sium ion batteries(PIBs).However,their development has been limited by the decomposition of elec-trolytes and the corrosion of Al foils(current collec
【机 构】
：
School of Chemistry and Chemical Engineering,Hunan University,Changsha 410082,Hunan,China;College of
论文部分内容阅读
The potassium bis(fluoro-sulfonyl)imide(KFSI)-based electrolyte has great application prospects in potas-sium ion batteries(PIBs).However,their development has been limited by the decomposition of elec-trolytes and the corrosion of Al foils(current collector)at high potential.Here,a N-doping,sulfur-rich chemically bonded porphyrin organic framework(SPOF)with a high potential plateau were synthesized as an anode to lower the redox potential of full cells and further inhibit the corrosion of Al foils.SPOF as anode delivers high reversible capacity(557 mAh g-1 at 50 mAg-1),excellent cycling performance(94％capacity retention over 1000 cycles at 500 mAg-1),and superior rate performance.Meanwhile,the ex-situ FTIR,Raman,and HRTEM revealed the stability of N-doping and the reversible covalent sulfur and S-S bonds changes during potassiation/depotassiation.In addition,full cells using SPOF anode and PTCDA cathode showed outstanding performance(high capacity of 300 mAh g-1 at 200 mAg-1).And the Al current collector of the full cell was not corroded after 150 cycles.Yet,the Al foils with PTCDA as cathode were seriously corroded.This work provides a new strategy for realizing ultra-high reversible capacity and cyclic stability of PIBs,and also accelerates the process of early commercial application of PIBs.
其他文献
Earth-abundant magnetite(Fe3O4)as cathode materials in aqueous zinc-ion batteries(ZIBs)is limited by its very low capacity and poor cycling.Here,a combined strategy based on carbon coating and electrolyte optimization is adopted to improve the performance
Non-noble-metal-based electrocatalysts with superior oxygen reduction reaction (ORR) activity to plat-inum (Pt) are highly desirable but their fabrications are challenging and thus impeding their applications in metal-air batteries and fuel cells.Here,we
Layered Aurivillius compound Bi5Ti3CrO15 has been synthesized by a hydrothermal method for the appli-cation as a photocatalyst to liberate hydrogen from water.Bi5Ti3CrO15 owns a narrow band gap(Eg～2.46 eV)and shows stable photocatalytic activity under bot
Hole transporting materials(HTMs)containing passivating groups for perovskite materials have attracted much attention for efficient and stable perovskite solar cells(PSCs).Among them,C≡N-based molecules have been proved as efficient HTMs.Herein,a series o
Potassium-selenium(K-Se)batteries have attracted more and more attention because of their high the-oretical specific capacity and natural abundance of K resources.However,dissolution of polyselenides,large volume expansion during cycling and low utilizati
Lithium-Sulfur(Li-S)batteries with high theoretical energy density are promising energy storage systems in the next decades,while the lithium polysulfides(LiPSs)shuttling caused by the sluggish sulfur redox reaction severely lowers the practical performan
Despite its high theoretical energy density,lithium metal faces huge challenges in its implementation as an anode for Li secondary batteries because of its uncontrollable dendritic growth and large volume change during plating/stripping processes.These ge
The selective aerobic oxidation of biomass-derived 5-hydroxymethylfurfural to 2,5-furandicarboxylic acid(FDCA,a potential renewable substitution of fossil-based terephthalic acid to produce polyethylene 2,5-furandicarboxylate plastic)is an appealing trans
Tungsten carbides have attracted wide attentions as Pt substitute electrocatalysts for hydrogen evolution reaction(HER),due to their good stability in an acid environment and Pt-like behaviour in hydrolysis.However,quantum chemistry calculations predict t
Herein,the electrochemical performance and the mechanism of potassium insertion/deinsertion in orthorhombic V2O5 nanoparticles are studied.The V2O5 electrode displays an initial potassiation/de-potassiation capacity of 200 mAh g-1/217 mAh g-1 in the volta