High energy density lithium-oxygen battery(LOB) is currently regraded as a promising candidate for next-generation power system.However,the dendrite and instability issues of Li metal anode lead to its poor cyclic sta...High energy density lithium-oxygen battery(LOB) is currently regraded as a promising candidate for next-generation power system.However,the dendrite and instability issues of Li metal anode lead to its poor cyclic stability and low energy density.In this work,lithiophilic Al_(2) O_(3) seeds induced rigid carbon nanotube arrays(CNTA)/three-dimensional graphene(3 DG) is developed as a host material for Li anode,namely Al_(2) O_(3)-CNTA/3 DG.It is demonstrated that the lithiophilic feature of Al_(2) O_(3) seeds and the enhanced rigidity of arrays can synergistically induce the uniform Li flux,inhibit the collapse of arrays,and stabilize electrolyte/electrode interfaces.As a result,the Al_(2) O_(3)-CNTA/3 DG-Li anode delivers a high Coulombic efficiency above 97% after 140 cycles(8 mAh cm^(-2) at 4 mA cm^(-2)).With this anode and the breathable CNTA/3 DG cathode,the full LOB exhibits a significantly increased life-span up to 160 cycles(500 mAh g^(-1) at 100 mA g^(-1)),which is almost 3 times longer than that with pure Li foil as the anodes.This work demonstrates a new approach to highly reversibly long-cycling performance of LOBs towards practical application.展开更多
基金supported by the National Natural Science Foundation of China (51801135, 51972225)the Natural Science Foundation of Tianjin (19JCQNJC03100)。
文摘High energy density lithium-oxygen battery(LOB) is currently regraded as a promising candidate for next-generation power system.However,the dendrite and instability issues of Li metal anode lead to its poor cyclic stability and low energy density.In this work,lithiophilic Al_(2) O_(3) seeds induced rigid carbon nanotube arrays(CNTA)/three-dimensional graphene(3 DG) is developed as a host material for Li anode,namely Al_(2) O_(3)-CNTA/3 DG.It is demonstrated that the lithiophilic feature of Al_(2) O_(3) seeds and the enhanced rigidity of arrays can synergistically induce the uniform Li flux,inhibit the collapse of arrays,and stabilize electrolyte/electrode interfaces.As a result,the Al_(2) O_(3)-CNTA/3 DG-Li anode delivers a high Coulombic efficiency above 97% after 140 cycles(8 mAh cm^(-2) at 4 mA cm^(-2)).With this anode and the breathable CNTA/3 DG cathode,the full LOB exhibits a significantly increased life-span up to 160 cycles(500 mAh g^(-1) at 100 mA g^(-1)),which is almost 3 times longer than that with pure Li foil as the anodes.This work demonstrates a new approach to highly reversibly long-cycling performance of LOBs towards practical application.
