Although lithium-sulfur (Li-S) batteries with high theoretical energy density and low cost have attracted extensive research, their commercialization is still unsuccessful due to the poor cycle life caused by the...

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Zn-Al film was prepared on biaxially oriented polypropylene (BOPP) substrate via vacuum thermal evaporation. The microstructure and its correlation with sheet resistance of Zn-Al film were explored systematically. The results showed that the macromorphology of Zn-Al film was closely related to the surface topography of BOPP substrate. XRD and SEM analysis indicated that Zn-Al film displayed a columnar and strong textured structure of Zn (002). TEM results revealed that the film thickness was in the range of 20-25 nm, of which amorphous alumina was identified on/at the surface and interface, while Zn and a small amount of ZnO were detected in the middle. The amorphous alumina on the film surface prevented the further oxidation of Zn, and therefore helped to improve the stability of sheet resistance of the film. Nevertheless, the insulative alumina significantly decreased the film conductivity, which deteriorated the current handling ability of metallized film capacitors.

In this research, the regeneration cycle of cobalt chemical conversion waste liquid, the effects of oxidizing agents on solution service life, and the influence of oxidizing agents on the treatment of waste liquid was studied by the electrochemical performance test. The scanning electron microscopy (SEM) and electrochemical properties analysis was used to study conversion coatings. It was determined that the best oxidizing agent for the cobalt chemical conversion waste liquid was 9 g/L KBrO3. Conversion coatings were thicker and had a higher density when the specific gravity of reclaimed liquid and stock solution was between 1:2 and 1:1.