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Advanced energy materials: multilayer understanding and structural design of high energy / rate lithium ion battery electrodes

wallpapers News 2020-09-19

is a convenient rapidly developing energy storage technology. Lithium ion batteries st out from a variety of commercially available electrochemical devices. The repetitive storage release of electric energy depend on the interconnected dynamic process. Because the electrode structure of the battery is multi-layer structure the battery can be endowed with different functions but at the same time it is also an important issue to fully explore the potential of each component. With the rapid penetration of transportation electrification power network the dem for high-energy high rate batteries is growing. To construct an ideal battery requires the efforts of science Engineering in many aspects as well as the in-depth understing of multi-level temporal spatial dynamics collaborative regulation.

although researchers are trying to find solutions from the aspects of material chemistry battery structure nanostructure lithium-ion battery technology still needs substantial breakthrough. Even if efficient active materials are designed synthesized their performance in the battery is often not in line with expectations leading to significant energy loss unsatisfactory properties. This deviation is mostly due to the multi-level dynamic process in time space. Compared with the research development of material chemistry structural design especially pore structure provides a more inclusive strategy for the application of various materials. By shortening the solid-state diffusion distance increasing the exposed ion transport channels nanotechnology can design regulate the electrochemical properties. On the other h increasing the loading of active materials can significantly improve the energy density but the thick electrode composed of nano materials still faces the problems of multi-scale dynamics such as the ion transport on the cluster scale of nano materials the charge transport on the mixed interface of active materials conductive agents. Therefore from atom / molecule to nano / micron to the whole electrode level we need to establish a multi-component multi-scale understing of the composite electrode systematically study the influence of porous structure on the transport kinetics electrochemical reaction.

Yu Guihua research group of University of Texas at Austin summarized the latest progress in the research of multi-layer dynamic process in lithium-ion batteries. Starting with the mechanism of electrochemical energy storage process the research learning of lithium-ion battery electrode from atom to electrode were illustrated including electrochemical experiment advanced characterization technology model calculation. Then they summarized some examples of thick electrodes with excellent transmission properties their design concepts. Finally the prospect of thick electrode design is prospected.

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