Effect of the Etching Profile of a Si Substrate on the Capacitive Characteristics of Three-Dimensional Solid-State Lithium-Ion Batteriesстатья
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Аннотация:Along with the soaring demands for all-solid-state thin-film lithium-ion batteries, theproblem of their energy density rise becomes very acute. The solution to this problem can be found indevelopment of 3D batteries. The present work deals with the development of a technology for a 3Dsolid-state lithium-ion battery (3D SSLIB) manufacturing by plasma-chemical etching and magnetronsputtering technique. The results on testing of experimental samples of 3D SSLIB are presented.It was found that submicron-scale steps appearing on the surface of a 3D structure formed on Sisubstrate by the Bosch process radically change the crystal structure of the upper functional layers.Such changes can lead to disruption of the layers’ continuity, especially that of the down conductors.It is shown that surface polishing by liquid etching of the SiO2 layer and silicon reoxidation leads tosurface smoothing, the replacement of the dendrite structure of functional layers by a block structure,and a significant improvement in the capacitive characteristics of the battery.