Nowadays,transition metal oxides are being rapidly developed for application as Na-ion storage anode materials,which provide a relatively high theoretical capacity compared to the graphitic anode;however,the evaluatio...Nowadays,transition metal oxides are being rapidly developed for application as Na-ion storage anode materials,which provide a relatively high theoretical capacity compared to the graphitic anode;however,the evaluation of enhanced electrochemical performance of SIBs via various approaches,such as coating or doping,is an ongoing process.Hence,in this study,a mesoporus ZnV_(2)O_(4)anode material with a spinel structure was successfully synthesized via a solvothermal technique followed by calcination at different temperatures;moreover,the impact of the calcination temperature on the Na-ion storage performance of this anode material was thoroughly investigated for the first time.The initial discharge capacities of 178,251,and 296 mA h g^(-1)were obtained for the cacination temperatures of 500,600,and 700℃,respectively;after 250 cycles,the ZVO-700 electrode retained the discharge capacity of 166 mA h g^(-1)at 200 mA g^(-1)with the high coulombic efficiency of 99%.Furthermore,ZVO-500 and ZVO-600 retained 55 mA h g^(-1)and 99 mA h g^(-1)with a~27%and~42%retention rate,respectively.The electrochemical Na-ion storage performance is predicted by the conversion reaction of ZnV_(2)O_(4).Moreover,the ZVO-700 sample showed higher surface area and pore volume,which led to remarkable electrochemical performance,than the ZVO-500 and ZVO-600 samples.展开更多
文摘Nowadays,transition metal oxides are being rapidly developed for application as Na-ion storage anode materials,which provide a relatively high theoretical capacity compared to the graphitic anode;however,the evaluation of enhanced electrochemical performance of SIBs via various approaches,such as coating or doping,is an ongoing process.Hence,in this study,a mesoporus ZnV_(2)O_(4)anode material with a spinel structure was successfully synthesized via a solvothermal technique followed by calcination at different temperatures;moreover,the impact of the calcination temperature on the Na-ion storage performance of this anode material was thoroughly investigated for the first time.The initial discharge capacities of 178,251,and 296 mA h g^(-1)were obtained for the cacination temperatures of 500,600,and 700℃,respectively;after 250 cycles,the ZVO-700 electrode retained the discharge capacity of 166 mA h g^(-1)at 200 mA g^(-1)with the high coulombic efficiency of 99%.Furthermore,ZVO-500 and ZVO-600 retained 55 mA h g^(-1)and 99 mA h g^(-1)with a~27%and~42%retention rate,respectively.The electrochemical Na-ion storage performance is predicted by the conversion reaction of ZnV_(2)O_(4).Moreover,the ZVO-700 sample showed higher surface area and pore volume,which led to remarkable electrochemical performance,than the ZVO-500 and ZVO-600 samples.
