Electrochemical studies of carbon-rich polymer-derived SiCN ceramics as anode materials for lithium-ion batteries

High Rate Capability of SiOC Ceramic Aerogels with Tailored Porosity as Anode Materials for Li-ion Batteries

“…Silicon oxycarbides are ceramic structures with silicon bonded to both oxygen and carbon simultaneously. The structure of SiOC beside the amorphous silicon oxycarbide network -in which Si atoms share bonds with O and C atoms simultaneously-contains an interconnected disordered free carbon phase which accounts for many of their excellent mechanical and electrochemical properties [27][28][29][30][31][32][33][34][35][36][37][38][39][40][41][42][43][44]. It came out from our previous studies on SiOC and SiCN ceramic materials [32,52] that free carbon content is an important factor determining reversible Li storage capacity and cycling stability.…”

Influence of activated charcoal on the structural and morphological characteristics of ceramic based on silicon oxycarbide (SiOC): A promising approach to obtain a new electrochemical sensing platform

“…SiOC glasses exhibited broad D-and G-bands, however the temperature increase promoted narrowing and better definition of D-bands (Table 3), indicating the organization of the C free phase. The presence of broad bands and their consequent narrowing with increasing of pyrolysis temperature are usually verified in polymeric precursors containing nitrogen and oxygen [15,17]. The narrowing of the G-band leads to greater structural similarity of the segregated carbon phase with respect to polycrystalline graphite, resulting in the decrease of defects and disorder within the layers.…”

Lithium intercalation into SiCN/disordered carbon composite. Part 1: influence of initial carbon porosity on cycling performance/capacity

“…This problem of capacity fading was solved by Feng; however, relatively low capacities of about 300 mAh g −1 were achieved after an additional heat treatment of the polymer-derived SiCN material. Promising electrochemical results with regard to the stability of SiCN derived from high-carbon containing polysilylcarbodiimides have been reported by Kaspar et al [10] and Graczyk-Zajac et al [11]. Within the work of Reinold et al [12], the excellent performance of carbon-rich SiCN materials with outstanding stability and capacities up to 600 mAh g −1 has been demonstrated, including the discussion of the influence of the molecular polymer structure on the resulting ceramic microstructure and in consequence on the electrochemical performance of the material.…”