Direct CVD Fabrication and Investigation of 2d Layered Hybrid Materials for Binder Free Li Ion Battery Anodes

Abstract

The increasing demand for high-performance, miniaturized, and integrable lithiumion newlinebatteries (LiBs), presents significant challenges in materials design and battery newlinefabrication. In particular, conventional anode materials often require polymer binders and newlineconductive additives during electrode manufacturing, which limits their application in newlineadvanced battery designs. Alternatively, two-dimensional (2D) layered materials offer newlineseveral advantages due to their high theoretical capacity and ease of fabrication in thin film newlineform. Among the various synthesis methods, chemical vapor deposition (CVD) remains the newlinepreferred choice for the direct electrode manufacturing without additives and binders. This newlinemethod enables the deposition of highly conductive and mechanically robust layered anode newlinematerials on current collectors. In this context, the present thesis aims at exploring the CVD newlinemethod to develop layered anode materials based on graphene and molybdenum disulfide newline(MoS2). By exploring the growth chemistry of these materials, nanostructured anodes with newlineenhanced performance are fabricated directly on current collectors and substrates that newlinepromote the self-organized growth of hybrid structures. newlineIn the first working chapter (Chapter 3), a self-organized growth of molybdenum newlinecarbide (Mo2C)/few-layer graphene core-shell type nanostructures is demonstrated on the newlineoxide (SiO2) substrate under the bifunctional catalytic effect of group VI transition metal newline(Mo). Cross-sectional transmission electron microscopy provides evidence for the few-layer newlinegraphene formation not only on the catalyst surface, but also at the SiO2/catalyst interface, newlineembedding the Mo2C nanoisland thus formed due to thermal dewetting. Electrochemical newlinestudies showed an areal capacity of 14 and#956;Ah/cm2 with an excellent capacity retention (86 % newlineeven after 100 cycles) at a current density of 0.5 and#956;A/cm2 for transferred Mo2C/graphene newlinehybrid film on stainless steel spacer newline