Design and fabrication of functional porous air cathode materials with superior catalytic activity is still the key point for non-aqueous lithium-oxygen(Li-O2) batteries. Herein, inspired by the self-standing three-di...Design and fabrication of functional porous air cathode materials with superior catalytic activity is still the key point for non-aqueous lithium-oxygen(Li-O2) batteries. Herein, inspired by the self-standing three-dimensional(3D) structure of the natural spinach leaves, a unique binder-free and self-standing porous Au/spinach cathode for high-performance Li-O2 batteries has been developed. The carbonized spinach leaves serve as a superconductive current collector and an ideal porous host for accommodating catalysts. The Au/spinach cathode could offer enough spaces for accommodating the discharge products, shorten the distance of the oxygen and electrolyte diffusion, and promote the oxygen reduction reaction(ORR) and oxygen evolution reaction (OER) processes. This optimized Au/spinach cathode achieved a high specific area capacity of 7.23 mA‧h/cm2 at a current density of 0.05 mA/cm2 and exhibited excellent stability(280 cycles at 0.05 mA/cm2 with a fixed capacity of 0.2 mA‧h/cm2). The superior performance encourages the construction of more advanced cathode architectures by the use of bio-composites for Li-O2 batteries.展开更多
The instabilities of the battery including cathode corrosion/passivation,shuttling effect of the redox mediators,Li anode corrosion,and electrolyte decomposition are major barriers toward the practical implementation ...The instabilities of the battery including cathode corrosion/passivation,shuttling effect of the redox mediators,Li anode corrosion,and electrolyte decomposition are major barriers toward the practical implementation of lithium-oxygen(Li-O2)batteries.Functional materials offer great potential in high performance Li-O2 batteries owing to their functional tailorability of chemical modification for alleviating side reactions and improving catalysis activity,well-defined properties for discharge products storage,and fast mass and electron transfer paths.In this review,instability problems of non-aqueous Li-O2 batteries and recent studies related to the functional materials in tackling the instability issues from rational cathode construction,inhibition of redox mediators(RMs)shuttling,anode protection and novel electrolyte design are illustrated.Future research directions to overcome the critical issues are also proposed for this promising battery technology.The instability issues and the related strategies with functional materials based on the comprehensive consideration of all battery components proposed in this review provide the systematic,deep understanding and rational design of functional materials for Li-O2 batteries,which is beneficial to achieving the practical Li-O2 batteries.展开更多
基金This work was supported by the National Natural Science Foundation of China(Nos.51771177,51972141,21835002,21621001)the"111"Project of China(No.B17020)+6 种基金the Project of the Education Department of Jilin Province,China(No.JJKH20190113KJ)the Jilin Province Science and Technology Development Program,China(No.20190303104SF)the Jilin Province/Jilin University Co-construction Project-Funds for New Materials,China(No.SXGJSF2017-3)the Science and Technology Breakthrough Plan of Henan Province,China(Nos.202102210242,212102210186)the Key Scientific Research Project of Higher Education of Henan Province,China(No.21A150055)the Post Doctoral Innovative Talent Support Program,China(No.BX20180122)the China Postdoctoral Science Foundation,China(No.2019M651195).
文摘Design and fabrication of functional porous air cathode materials with superior catalytic activity is still the key point for non-aqueous lithium-oxygen(Li-O2) batteries. Herein, inspired by the self-standing three-dimensional(3D) structure of the natural spinach leaves, a unique binder-free and self-standing porous Au/spinach cathode for high-performance Li-O2 batteries has been developed. The carbonized spinach leaves serve as a superconductive current collector and an ideal porous host for accommodating catalysts. The Au/spinach cathode could offer enough spaces for accommodating the discharge products, shorten the distance of the oxygen and electrolyte diffusion, and promote the oxygen reduction reaction(ORR) and oxygen evolution reaction (OER) processes. This optimized Au/spinach cathode achieved a high specific area capacity of 7.23 mA‧h/cm2 at a current density of 0.05 mA/cm2 and exhibited excellent stability(280 cycles at 0.05 mA/cm2 with a fixed capacity of 0.2 mA‧h/cm2). The superior performance encourages the construction of more advanced cathode architectures by the use of bio-composites for Li-O2 batteries.
基金This work was supported by the National Natural Science Foundation of China(Nos.51771177,51972141,21621001,21835002)the Jilin Province Science and Technology Development Program,China(No.20190303104SF)+3 种基金the Jilin Province/Jilin University Co-construction Project-Funds for New Materials,China(No.SXGJSF2017-3)the Science and Technology Breakthrough Plan of Henan Province,China(Nos.202102210242,212102210186)the Key Scientific Research Project of Higher Education of Henan Province,China(No.21A150055)the Undergraduate Innovation and Entrepreneurship Training Program of Zhengzhou University of Technology,China(No.201911068020).
文摘The instabilities of the battery including cathode corrosion/passivation,shuttling effect of the redox mediators,Li anode corrosion,and electrolyte decomposition are major barriers toward the practical implementation of lithium-oxygen(Li-O2)batteries.Functional materials offer great potential in high performance Li-O2 batteries owing to their functional tailorability of chemical modification for alleviating side reactions and improving catalysis activity,well-defined properties for discharge products storage,and fast mass and electron transfer paths.In this review,instability problems of non-aqueous Li-O2 batteries and recent studies related to the functional materials in tackling the instability issues from rational cathode construction,inhibition of redox mediators(RMs)shuttling,anode protection and novel electrolyte design are illustrated.Future research directions to overcome the critical issues are also proposed for this promising battery technology.The instability issues and the related strategies with functional materials based on the comprehensive consideration of all battery components proposed in this review provide the systematic,deep understanding and rational design of functional materials for Li-O2 batteries,which is beneficial to achieving the practical Li-O2 batteries.
