The narrow layer spacing of layered vanadium pentoxide(α-V_(2)O_(5))and the slow diffusion kinetics of Zn^(2+)limit its application in aqueous zinc-ion batteries.The organic molecule pre-insertion strategy has been p...The narrow layer spacing of layered vanadium pentoxide(α-V_(2)O_(5))and the slow diffusion kinetics of Zn^(2+)limit its application in aqueous zinc-ion batteries.The organic molecule pre-insertion strategy has been proposed to improve its electrochemical performance.Nevertheless,the embedding of electrochemically inert organic molecules leads to a decrease in the volume-specific capacity.Here,a biorganic molecular co-insertion strategy is proposed by introducing electrochemically active cyclohexanehexone octahydrate(KCO)and 1-methyl-2-pyrrolidone(NMP)into α-V_(2)O_(5) to obtain different spacings of α-V_(2)O_(5)(11.93,11.77,11.06,8.76,and 7.67Å)and optimize electrochemical properties by spacing.Furthermore,experiments and DFT calculations reveal that co-insertion provides additional active sites(CvO/C-O),enhances electrical conductivity,and reduces desolvation energy,thus leading to superior zinc storage properties.Thus,benefiting from the collaborative effect of the bi-organic molecules and the suitable layer spacing,VNK4(8.76Å)possesses the best electrochemical performance with a 95.7% capacity retention over 100 cycles at 0.5 A g^(-1) and a specific capacity of up to 190.6 mA h g^(-1) over 9500 cycles at 10 A g^(-1).This work offers a novel thought for constructing the organic-inorganic hybrid cathode.展开更多
基金the National Natural Science Foundation of China(22469019,22109106)the Natural Science Support Program(2024DB045)the Youth Innovation Top Talent Program(CXBJ202305)at Shihezi University.
文摘The narrow layer spacing of layered vanadium pentoxide(α-V_(2)O_(5))and the slow diffusion kinetics of Zn^(2+)limit its application in aqueous zinc-ion batteries.The organic molecule pre-insertion strategy has been proposed to improve its electrochemical performance.Nevertheless,the embedding of electrochemically inert organic molecules leads to a decrease in the volume-specific capacity.Here,a biorganic molecular co-insertion strategy is proposed by introducing electrochemically active cyclohexanehexone octahydrate(KCO)and 1-methyl-2-pyrrolidone(NMP)into α-V_(2)O_(5) to obtain different spacings of α-V_(2)O_(5)(11.93,11.77,11.06,8.76,and 7.67Å)and optimize electrochemical properties by spacing.Furthermore,experiments and DFT calculations reveal that co-insertion provides additional active sites(CvO/C-O),enhances electrical conductivity,and reduces desolvation energy,thus leading to superior zinc storage properties.Thus,benefiting from the collaborative effect of the bi-organic molecules and the suitable layer spacing,VNK4(8.76Å)possesses the best electrochemical performance with a 95.7% capacity retention over 100 cycles at 0.5 A g^(-1) and a specific capacity of up to 190.6 mA h g^(-1) over 9500 cycles at 10 A g^(-1).This work offers a novel thought for constructing the organic-inorganic hybrid cathode.
