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Atomic/nano-scale in-situ probing the shuttling effect of redox mediator in Na-O_(2) batteries

Journal of Energy Chemistry 2021年第5期30卷 438-443页

作者： Kai Yang Yiwei Li Langlang Jia Yan Wang Zijian Wang YuChen jia Shichun Yang magda titirici Xinhua Liu Luyi Yang Feng Pan School of Advanced Materials Peking University Shenzhen Graduate SchoolShenzhen 518055GuangdongChina School of Transportation Science and Engineering Beihang UniversityBeijing 100191China Department of Chemical Engineering Imperial College LondonLondon SW72AZUK

Sodium-oxygen batteries(Na-O_(2))have attracted extensive attention as promising energy storage systems due to their high energy density and low *** mediators are often employed to improve Na-O_(2) battery performance,however,their effect on the formation mechanism of the oxygen reduction product(NaO_(2))is still ***,we have investigated the formation mechanism of NaO_(2) during the discharge process in the presence of a redox mediator with the help of atomic/nano-scale in-situ characterization tools used in concert(*** force microscope,electrochemical quartz crystal microbalance(EQCM)and laser nano-particle analyzer).As a result,real-time observations on different time scales show that by shuttling electrons to the electrolyte,the redox mediator enables formation of NaO_(2) in the solution-phase instead of within a finite region near the electrode *** findings provide new fundamental insights on the understanding of Na-O_(2) batteries and new consequently perspectives on designing high performance metal-O_(2) batteries and other related functions.

关键词： Na-O_(2)battery In-situ AFM EQCM Redox mediator Shuttling effect

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Designer uniform Li plating/stripping through lithium–cobalt alloying hierarchical scaffolds for scalable high-performance lithium-metal anodes

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Journal of Energy Chemistry 2021年第1期30卷 385-392,I0013页

作者： Xinhua Liu Xiaojuan Qian Weiqiang Tang Hui Luo Yan Zhao Rui Tan Mo Qiao Xinlei Gao Yang Hua Huizhi Wang Shuangliang Zhao Chao Lai magda titirici Nigel PBrandon Shichun Yang Billy Wub School of Transportation Science and Engineering Beihang UniversityBeijing 100191China Imperial College London Sough Kensington CampusSW72AZLondonUnited Kingdom School of Chemistry and Materials Science Jiangsu Normal UniversityXuzhou 221116JiangsuChina State Key Laboratory of Chemical Engineering and School of Chemical Engineering East China University of Science and TechnologyShanghai 200237China

Lithium metal anodes are of great interest for advanced high-energy density batteries such as lithiumair, lithium-sulfur and solid-state batteries, due to their low electrode potential and ultra-high theoretical capacity. There are, however, several challenges limiting their practical applications, which include low coulombic efficiency, the uncontrollable growth of dendrites and poor rate capability. Here, a rational design of 3D structured lithium metal anodes comprising of in-situ growth of cobalt-decorated nitrogen-doped carbon nanotubes on continuous carbon nanofibers is demonstrated via *** porous and free-standing scaffold can enhance the tolerance to stresses resulting from the intrinsic volume change during Li plating/stripping, delivering a significant boost in both charge/discharge rates and stable cycling performance. A binary Co-Li alloying phase was generated at the initial discharge process, creating more active sites for the Li nucleation and uniform deposition. Characterization and density functional theory calculations show that the conductive and uniformly distributed cobalt-decorated carbon nanotubes with hierarchical structure can effectively reduce the local current density and more easily absorb Li atoms, leading to more uniform Li nucleation during plating. The current work presents an advance on scalable and cost-effective strategies for novel electrode materials with 3D hierarchical microstructures and mechanical flexibility for lithium metal anodes.

关键词： Li metal anode Mixed conductor interface 3D porous host Dendrite free Metal-carbon nanofibers

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