The development of highly safe and low-cost aqueous batteries is of great significance in the background of carbon neutrality.However,the practical deployment of aqueous batteries has been plagued due to their relativ...The development of highly safe and low-cost aqueous batteries is of great significance in the background of carbon neutrality.However,the practical deployment of aqueous batteries has been plagued due to their relatively low capacity and poor cycling stability.Herein,we propose unique conversion electrochemistry of copper selenides for robust and energetic aqueous charge storage.In situ X-ray diffraction and operando Raman techniques reveal a reversible transformation from CuSe to Cu_(2)Se through the intermediates of Cu_(3)Se_(2) and Cu_(1.8)Se.Such a conversion process activates the redox carrier of Cu^(2+)ion and delivers a remarkable rate capability of 285 mAh g^(-1) at 20 A g^(-1) and electrochemical durability up to 30,000 cycles.Furthermore,Cu^(2+)and H+coinsertion chemistry is proposed to facilitate the conversion process.As a proof-of-concept,a hybrid aqueous pouch cell coupling CuSe//Zn is capable of affording maximum energy and power densities of 190 Wh kg^(-1) and 1366W kg^(-1),respectively.展开更多
基金Natural Science Foundation of Shanghai,Grant/Award Number:22ZR1403600Natural Science Foundation of Jiangsu Province,Grant/Award Number:BK20180002+1 种基金National Natural Science Foundation of China,Grant/Award Numbers:22109029,51772197,51872192,52025028,52172219Natural Science Foundation of the Jiangsu Higher Education Institutions of China,Grant/Award Number:19KJA170001。
文摘The development of highly safe and low-cost aqueous batteries is of great significance in the background of carbon neutrality.However,the practical deployment of aqueous batteries has been plagued due to their relatively low capacity and poor cycling stability.Herein,we propose unique conversion electrochemistry of copper selenides for robust and energetic aqueous charge storage.In situ X-ray diffraction and operando Raman techniques reveal a reversible transformation from CuSe to Cu_(2)Se through the intermediates of Cu_(3)Se_(2) and Cu_(1.8)Se.Such a conversion process activates the redox carrier of Cu^(2+)ion and delivers a remarkable rate capability of 285 mAh g^(-1) at 20 A g^(-1) and electrochemical durability up to 30,000 cycles.Furthermore,Cu^(2+)and H+coinsertion chemistry is proposed to facilitate the conversion process.As a proof-of-concept,a hybrid aqueous pouch cell coupling CuSe//Zn is capable of affording maximum energy and power densities of 190 Wh kg^(-1) and 1366W kg^(-1),respectively.
