A Summary of Li-CO2 Electrochemical Research Published by Lanzhou Institute of Chemical Industry
Li-CO2 electrochemically couples the dual characteristics of effective CO2 fixation and advanced energy storage, and has the characteristics of high energy density (1876Wh Kg-1) and environmental friendliness. In recent years, it has attracted great attention in the field of energy storage. At present, although research progress has been made in this field, research on Li-CO2 is still in its infancy, and the understanding of the mechanism of Li-CO2 electrochemical reaction is not clear enough, and there are still many disputes. In addition, the nature of the electrolyte, the intrinsic characteristics and design strategy of the electrode material (catalyst), and the stability of the metal Li anode / electrolyte interface greatly affect the electrochemical reaction process, which affects the electrochemical performance of the corresponding energy storage device. Moreover, there is still a lack of relevant strategies for constructing and designing advanced flexible Li-CO2 batteries.
In response to the current controversies and challenges in Li-CO2 electrochemical research, recently, Yan Xingbin, a researcher of the Clean Energy Chemistry and Materials Laboratory of the Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, and the relevant personnel of the State Key Laboratory of Carbonylation and Selective Oxidation have cooperated in Energy & Environmental Science published a review article (Recent advances in understanding Li-CO2 electrochemistry, DOI: 10.1039 / c8ee03417f) on the progress of Li-CO2 electrochemistry research.
This review comprehensively summarizes the reaction mechanism of Li-CO2 cells (including CO2 reduction / precipitation mechanism and CO2 reduction / precipitation mechanism with O2 participation), involving the identification of discharge and charging products and the key factors affecting the electrochemical process, and points out the current The controversy existing in the mechanism research and the focus of the next research. While summarizing the mechanism, it also systematically clarified the factors that affect the CO2 reduction / precipitation activity of Li-CO2 batteries and the overall performance of Li-CO2 batteries and Li-O2 / CO2 batteries, including the lithium anode-electrolyte-carbon dioxide three-phase reaction interface Properties, electrolyte characteristics, and crystal structure, design strategy, chemical composition, and microscopic physical parameters of the cathode material (catalyst). Finally, the review looks forward to the design concept of constructing flexible Li-CO2 batteries from the aspects of designing strong lithium metal anodes, constructing highly active carbon dioxide cathodes, and developing solid polymer electrolytes. On this basis, the key problems and scientific challenges facing the current Li-CO2 electrochemical research are put forward, and the future research ideas and directions in this field are proposed.
This review provides guidance for deepening understanding of Li-CO2 electrochemistry and designing high-performance and suitable Li-CO2 batteries.
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