Summary
Designing separators with excellent electrolyte wettability is of great significance to improve the electrochemical behavior of lithium‐ion batteries (LIBs). Herein, we develop a sandwich‐structured separator by facile in situ polymerization of polyaniline (PANI) on the both sides of polypropylene (PP) separator. The introduction of PANI coating improves the electrolyte wettability of the PP separators. Consequently, the cells equipped with this sandwich‐structured separator demonstrate superior electrochemical performance including initial capacity, rate performance, and cyclic stability compared with the PP separator. This work may provide a facile approach for separator modification to improve the performance of LIBs.
In this study, novel core-shell SiO 2 -coated iron nanoparticles (SiO 2 -nZVI) were synthesized using a one-step Stöber method. The Malachite green degradation abilities of the nanoparticles were investigated. The effects of ethanol/distilled water volume ratio, presence and absence of PEG, tetraethyl orthosilicate (TEOS) dosage, and hydrolysis time used in the nanoparticles preparation process were investigated. The results indicated that the SiO 2 -coated iron nanoparticles had the highest reduction activity when the particles synthesized with ethanol/H 2 O ratio of 2:1, PEG of 0.15 ml, TEOS of 0.5 ml and the reaction time was 4 h. The SiO 2 -nZVI nanoparticles were characterized using Transmission Electron Microscopy (TEM), Energy Dispersive Spectrometry (EDS) and powder X-Ray Diffraction (XRD). The results showed that the average particles diameter of the SiO 2 -nZVI was 20 -30 nm. The thickness of the outside SiO 2 film is consistent and approximately 10 nm. The results indicated that the nanoparticles coated completely with a transparent SiO 2 -film. Such nanoparticles could have wide applications in dye decolorization.
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