Nano-ionology refers to a new discipline that studies the phenomenon of ion migration in solids at the nano-scale, and the related properties, effects, mechanisms, and applications, lithium-ion batteries, fuel cells, supercapacitors, and ionic resistive memory (ionic memory) is closely related to nano-ionology. At present, the focus of attention on nano-ionology is mainly on oxide materials, ion conductors, and ion transport behavior and related properties at the interface of materials. Studying the transport of ions at the nanometer scale is of great significance for the development of nano-ion devices and exploring novel physical effects.
In recent years, the research team of Li Runwei from the Ningbo Institute of Materials Science and Technology of the Chinese Academy of Sciences has made a series of progress in the research of ion transmission in thin film materials. First, the research team constructed an atomic scale quantum dot contact structure in the Nb / ZnO / Pt and ITO / ZnO / ITO sandwich film structures by controlling the transport of niobium ions and oxygen ions through the application of an electric field at room temperature. Obtained quantum conductance behavior (Adv. Mater., 24, 3941-3946 (2012)). Subsequently, the research team used poly-Schiff base doped with protonic acid (PA-TsOH) as the research object, and controlled the doping degree of protonic acid ions in the main chain of polyschiff base through the electric field, precisely controlling the resistance state of the material. Finally, a resistive switching device with high consistent resistive behavior and multi-state, self-rectifying characteristics is obtained (JACS, 134, 17408-17411 (2012)).
Recently, the research team prepared a Pt / LixCoO2 / Pt sandwich structure thin film device with stable resistive performance, which confirmed that the resistive behavior of the device is closely related to the migration of lithium ions under the action of the electric field, and the resistance state of the device is related to the lithium in the film The concentration corresponds. Subsequently, the researchers used a conductive atomic force microscope (C-AFM) at the nanometer scale (~ 10 nm) to study the change process of the local conductivity of LixCoO2 thin films under the action of an electric field, and found that lithium ions in the LixCoO2 grains near the grain boundary Lithium ions that are far away from the grain boundary (inside the grain) are more likely to migrate under the action of an electric field, and the semi-quantitative relationship between the grain size and the critical migration voltage is given. The first-principles calculation results show that the migration barrier height of lithium ions at the grain boundary is only 0.7 eV, which is much smaller than the migration barrier height of lithium ions inside the grain (6.8 eV), which is basically consistent with the experimental results. In addition, their research results show that lithium ions in LixCoO2 grains of small size are more easily deintercalated at the same voltage and have a faster migration speed. The study found that in order to understand the behavior of ion transport under the action of an electric field in the nanometer range, it is of great significance to develop high-performance lithium-ion batteries and develop nano-ion devices.
Related results were published in Scientific Reports. (3, 1084 2013) under Nature. The research work was supported by projects such as the National 973 Sub-Question, the National Natural Science Foundation of China, and the Hundred Talents Program of the Chinese Academy of Sciences.
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