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Solid-state batteries using sulfide solid electrolytes have the advantages of high safety, high energy density, and long cycle life. They are expected to be lighter, more durable, safer, and cheaper than existing batteries, and are considered the development direction of next-generation power batteries one. However, problems such as difficulty in interface charge transfer and poor interface stability of sulfide solid electrolytes restrict the safety, energy density, cycle life, and fast charging performance of the battery, leading to obstacles to the industrialization of solid-state batteries. Therefore, it is necessary to develop key solid-state battery technologies such as interface high-speed transmission and interface stabilization to promote the development of sulfide solid-state batteries.
The solid-state energy system center team led by Cui Guanglei, a researcher at the Qingdao Institute of Bioenergy and Processes, Chinese Academy of Sciences, focused on key issues in the development of power batteries, developed key technologies for high-speed transmission and stabilization of sulfide solid-state batteries, and achieved important results to solve the solid-state battery industry The difficult problems of the development of chemistry lay a research foundation. In 2017, a polymer conductive fiber toughening technology was designed through bionic simulation to improve the fracture strength of sulfide electrolyte; in 2018, based on the design concept of rigidity and flexibility, the use of polyvinylene carbonate-Li10SnP2S12 supramolecular chemical action, Develop in-situ polymerization integrated solid-state battery technology to obtain LiFe0.2Mn0.8PO4-based room temperature solid-state lithium batteries with excellent specific capacity and cycle performance (ACS Applied Materials & Interfaces 2018, 10, 13588-13597); in 2019, in understanding organic and inorganic Based on the lithium transport mechanism and structure-activity relationship of the composite electrolyte, a polymer-sulfide composite electrolyte with a three-dimensional bicontinuous conductive phase is designed, and the atomic-scale in-situ generation technology of ion and electron transport channels is proposed and developed to achieve rapid electrons and ions Transmission (room temperature ion conductivity can reach 10-3 S cm-1 or more), providing technical support for the development of solid-state lithium batteries with high safety, high capacity and fast charge and discharge.
Recently, Cui Guanglei, Associate Researcher Ma Jun from Qingdao Energy Institute and Tianjin University of Technology Doctor Li Chao, Professor Luo Jun, and Researcher Gu Lin from the Institute of Physics, Chinese Academy of Sciences, adopted in-situ scanning transmission electron microscope differential phase contrast imaging technology to achieve lithium cobalt oxide/sulfide The visualization study of lithium ion transport at the interface between the material and electrolyte, and the design and preparation of the interface structure with discontinuously distributed barium titanate (BaTiO3) nano-single crystal particles, to prove a new built-in electric field and chemical potential coupling technology to improve the interface lithium transport Feasibility, providing new technical solutions for improving interface lithium ion transmission and improving battery fast charging performance. Based on this, deepen the understanding of the scientific problems of sulfide solid-state batteries from the perspective of supramolecular chemistry and the interface structure-activity relationship, and provide solutions for the rational design of high-energy-density solid-state lithium metal batteries and solving their technical problems (Advanced Materials 2019, 31, 1902029; Matter 2020, 2, 805-815).
The research work is supported by the National Key Research and Development Program, the National Natural Science Foundation of China, the Strategic Leading Science and Technology Project of the Chinese Academy of Sciences, and the Shandong Provincial Department of Science and Technology.
(A) Schematic diagram of the working principle of in-situ scanning transmission electron microscope differential phase contrast imaging technology; (b) in-situ scanning transmission electron microscope differential phase contrast imaging results of lithium cobaltate/sulfide solid electrolyte interface; (c) built-in electric field And chemical potential coupling technology to improve the interface lithium transport mechanism schematic diagram
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