Sodium-organic batteries utilizing natural abundance of sodium element and renewable active materials gain great attentions for grid-scale applications.However,the development is still limited by lack of suitable orga...Sodium-organic batteries utilizing natural abundance of sodium element and renewable active materials gain great attentions for grid-scale applications.However,the development is still limited by lack of suitable organic cathode materials with high electronic conductivity that can be operated stably in liquid electrolyte.Herein,we present 5,15-bis(ethynyl)-10,20-diphenylporphyrin(DEPP)and[5,15-bis(ethynyl)-10,20-diphenylporphinato]copper(II)(CuDEPP)as new cathodes for extremely stable sodium-organic batteries.The copper(II)ion partially contributes the charge storage and significantly stabilizes the structure of porphyrin complex for electrochemical energy storage.In situ electrochemical stabilization of organic cathode with a lower charging current density was identified which enables both improved high energy density and power density.An excellent longterm cycling stability up to 600 cycles and an extremely high power density of 28 kW kg−1 were achieved for porphyrin-based cathode.This observation would open new pathway for developing highly stable sodium-organic cathode for electrochemical energy storage.展开更多
Aqueous ammonium-ion battery(AAIB)has attracted much attention due to its low cost,safety,and environmental friendliness,but its electrode materials have many limitations.Here,alloxazine(ALO)is introduced as the anode...Aqueous ammonium-ion battery(AAIB)has attracted much attention due to its low cost,safety,and environmental friendliness,but its electrode materials have many limitations.Here,alloxazine(ALO)is introduced as the anode for the AAIB.With its pseudocapacitive effect and fast diffusion kinetics of NH4+,ALO anode shows excellent rate performance with a specific capacity of 120 mAh/g at 40 C(10 A/g).The full battery is further fabricated by ALO anode and Prussian white analogs cathode.Its specific capacity can reach 110 mAh/g and it can work up to 10,000 cycles with no obvious capacity fading at 20 C(5 A/g).In addition,the system delivers a high energy density of 122.5 Wh/kg and a power density of 5,055 W/kg.This work broadens the application prospect of the AAIB.展开更多
基金financially supported by National Natural Science Foundation of China(21805236)Scientific Research Fund of Hunan Provincial Education Department(18B062)+1 种基金Fundamental Research Fund of Xiangtan University(18QDZ14)Guangdong Basic and Applied Basic Research Foundation(2019A1515110819)。
文摘Sodium-organic batteries utilizing natural abundance of sodium element and renewable active materials gain great attentions for grid-scale applications.However,the development is still limited by lack of suitable organic cathode materials with high electronic conductivity that can be operated stably in liquid electrolyte.Herein,we present 5,15-bis(ethynyl)-10,20-diphenylporphyrin(DEPP)and[5,15-bis(ethynyl)-10,20-diphenylporphinato]copper(II)(CuDEPP)as new cathodes for extremely stable sodium-organic batteries.The copper(II)ion partially contributes the charge storage and significantly stabilizes the structure of porphyrin complex for electrochemical energy storage.In situ electrochemical stabilization of organic cathode with a lower charging current density was identified which enables both improved high energy density and power density.An excellent longterm cycling stability up to 600 cycles and an extremely high power density of 28 kW kg−1 were achieved for porphyrin-based cathode.This observation would open new pathway for developing highly stable sodium-organic cathode for electrochemical energy storage.
基金the National Natural Science Foundation of China(Nos.51771094 and 21835004)Ministry of Education of China(Nos.B12015 and IRT13R30)Tianjin Natural Science Foundation(No.18JCZDJC31500).
文摘Aqueous ammonium-ion battery(AAIB)has attracted much attention due to its low cost,safety,and environmental friendliness,but its electrode materials have many limitations.Here,alloxazine(ALO)is introduced as the anode for the AAIB.With its pseudocapacitive effect and fast diffusion kinetics of NH4+,ALO anode shows excellent rate performance with a specific capacity of 120 mAh/g at 40 C(10 A/g).The full battery is further fabricated by ALO anode and Prussian white analogs cathode.Its specific capacity can reach 110 mAh/g and it can work up to 10,000 cycles with no obvious capacity fading at 20 C(5 A/g).In addition,the system delivers a high energy density of 122.5 Wh/kg and a power density of 5,055 W/kg.This work broadens the application prospect of the AAIB.
