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Silica gel solid nanocomposite electrolyte with higher interfacial conductivity than that of liquid ion electrolyte
Silica Gel Solid Nanocomposite Electrolytes with Interfacial Conductivity Promotion Exceeding the Bulk Li-ion Conductivity of the Ionic Liquid Electrolyte Filler
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Solid state lithium-ion batteries can make the energy density reach 1000 W · hour / liter or even higher. The possibility of using the complex of porous oxide matrix filled with non-volatile ionic liquid electrolyte as solid electrolyte has been studied. However, with the increase of viscosity, the ionic conductivity of the electrolyte solution in the nanoscale pores becomes lower and lower. In this study, it has been proved that the lithium-ion conductivity of nanocomposites composed of porous silica and ionic liquid electrolyte filler can be several times higher than that of pure ionic liquid electrolyte by introducing the interface ice layer. The strong adsorption and order of liquid ions make them as fixed and solid as ice layer. The dipoles on the mesophase layer lead to the solvation of Li + ions, thus enhancing the conductivity. The principle of enhanced ion conduction proved in this study can be applied to different ion systems.
Fig. 28. macroscopic and microscopic structure of nano SCE (A) picture of two nano SCE precipitates synthesized in small bottles (left); transparent particles with blue transparency can be obtained after gel. After the Ile was removed, a highly porous silica matrix (right) was obtained, with brittle white precipitates remaining. (B) Scanning electron microscope (SEM) images of SiO2 matrix after ile removal. (C) (b) the scale-up of the image depicts the mesoporous properties of the matrix material with large pores. (D) TEM images show the dense accumulation of 7-10 nm silica nanoparticles, which is the basis of porous matrix materials. (E) The dotted line is the theoretical porosity determined by the volume fraction of ile and silica.
Reference
Chen X, Put B, Sagara A, et al., Science Advances, 6(2): eaav3400, 2020.
Source of this article: new science and technology news, No. 1, 2020, China micron and nanotechnology society, click "read the original" to view more latest science and technology information.
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