Shenzhen Advanced Institute made progress in the field of nanoscale electrochemical performance characterization
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[ Instrument Network Instrument Development ] Recently, the Center for Nano-Regulation and Biomechanics of the Institute of Advanced Technology and Research, Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences has made new progress in the field of nanoscale electrochemical performance characterization. The related results are published in the energy journal Nano Energy (Resolving local dynamics of dual ions at the nanoscale in electrochemically active materials). on. Yu Junwei, a Ph.D. student at the Center for Nano-Regulation and Biomechanics of Shenzhen Advanced Institute, is the first author of the thesis. Huang Boyuan, a Ph.D. student at the University of Washington, and Li Olin, a Ph.D. student at Xiangtan University, are the co-first authors. Li Jiangyu, director of the Nano Regulatory Center of Shenzhen Advanced Institute Corresponding author, Liu Yunya and Xie Shuhong, professors of Xiangtan University, are co-authors.
Dual ion batteries have the advantages of high working voltage, long cycle life, safety, low cost, etc., and have received extensive attention in recent years. Compared with traditional single ion batteries (lithium/sodium ion batteries), both anions and cations in dual ion battery systems are simultaneously Participating in the reaction, the reaction process is more complicated. In order to fully utilize the potential of the dual ion battery, it is necessary to deeply understand the microelectrochemical processes in which the nanoscale anions and cations compete with each other.
Based on this, the team used electrochemically active float glass as the research object of dual ion micro-kinetics, and characterized it by electrochemical strain microscopy (ESM) at nanoscale electrochemical properties, and through interesting ion relaxation. The kinetic curve reveals the microscopic mechanism of Vegard's electrochemical strain (Vegard strain) and electrochemical dipoles in the dual ion system. At the same time, combined with phase field simulation, the microscopic sodium ion diffusion coefficient and activation energy were quantitatively measured and consistent with the macroscopic test results. The method can be applied not only to a dual ion battery, but also to a wide application prospect in a halogenated perovskite solar cell and a functional oxide.
The above work was funded by the National Key Research and Development Program Nanotechnology Key Project and the National Natural Science Foundation Instrument Development Project.