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

Pradeep, V. S.; Ayana, Dawit G.; Graczyk‐Zajac, Magdalena; Sorarù, Gian Domenico; Riedel, Ralf

doi:10.1016/j.electacta.2015.01.088

Cited by 106 publications

(83 citation statements)

References 52 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The intensity of such peak increased when the PDMS amount increased compared to PHMS, as can be seen. In Table 1, the mean pore diameters are calculated by d = 4 V/A, where V is the total pore volume and A is the BET surface area4243. This model for the average pore size assumes that the pores are cylindrical and open at both ends; therefore this mathematical expression does not include much physical meaning unless the data come from mono-modal and narrowly-distributed pores, which is not the case for present study.…”

Section: Resultsmentioning

confidence: 99%

Gradient-Hierarchic-Aligned Porosity SiOC Ceramics

Vakifahmetoğlu

Zeydanlı

Innocentini

et al. 2017

Sci Rep

View full text Add to dashboard Cite

This work describes a simple technique to produce porous ceramics with aligned porosity having very high permeability and specific surface area. SiOC-based compositions were processed from blends of three types of preceramic polymer and a catalyst, followed by curing and pyrolysis. The heating applied from the bottom of molds promoted the nucleation, expansion and rising of gas bubbles, and the creation of a ceramic matrix with axially oriented channels interconnected by small round pores. The samples were analyzed by SEM, tomography, BET, water immersion porosimetry and permeation to gas flow. The resulting bodies presented levels of open porosity (69.9–83.4%), average channel diameter (0.59–1.25 mm) and permeability (0.56–3.83 × 10−9 m2) comparable to those of ceramic foams and honeycomb monoliths, but with specific surface area (4.8–121.9 m2/g) typical adsorbents, enabling these lotus-type ceramics to be advantageously used as catalytic supports and adsorption components in several environmental control applications.

show abstract

Section: Resultsmentioning

confidence: 99%

Gradient-Hierarchic-Aligned Porosity SiOC Ceramics

Vakifahmetoğlu

Zeydanlı

Innocentini

et al. 2017

Sci Rep

View full text Add to dashboard Cite

show abstract

“…Porous polymer‐derived SiOC, which combine the excellent rate performance of porous materials with the high capacity measured for silicon oxycarbides, could be a significant step forward toward new anodes with improved performance for Li ion batteries. Consequently, in our laboratory, we studied the electrochemical behavior of porous SiOC and we showed that a reversible capacity up to 600 mAh/g at a 1 C rate and up to 200 mAh/g at a 10 C rate can be obtained . Among the porous silicon oxycarbides, we focus our attention on SiOC aerogels synthesized through an innovative process we recently developed .…”

Section: Introductionmentioning

confidence: 99%

“…Consequently, in our laboratory, we studied the electrochemical behavior of porous SiOC and we showed that a reversible capacity up to 600 mAh/g at a 1 C rate and up to 200 mAh/g at a 10 C rate can be obtained . Among the porous silicon oxycarbides, we focus our attention on SiOC aerogels synthesized through an innovative process we recently developed . Aerogels are porous materials obtained through supercritical solvent extraction from a wet gel.…”

Section: Introductionmentioning

confidence: 99%

Structural Design of Polymer‐Derived SiOC Ceramic Aerogels for High‐Rate Li Ion Storage Applications

et al. 2016

View full text Add to dashboard Cite

SiOC ceramic aerogels with different porosity, pore size, and specific surface area have been synthesized through the polymer‐derived ceramic route by modifying the synthesis parameters and the pyrolysis steps. Preceramic aerogels are prepared by cross‐linking a linear polysiloxane with divinylbenzene (DVB) via hydrosilylation reaction in the presence of a Pt catalyst under highly diluted conditions. Acetone and cyclohexane are used as solvent in our study. Wet gels are subsequently supercritically dried with CO2 to get the final preceramic aerogels. The SiOC ceramic aerogels are obtained after a pyrolysis treatment at 900°C in two different atmospheres: pure Ar and H2 (3%)/Ar mixtures. The nature of the solvent has a profound influence of the aerogel microstructure in terms of porosity, pore size, and specific surface area. Synthesized SiOC ceramic aerogels have similar chemical compositions irrespective of processing conditions with ~40 wt% of free carbon distributed within remaining mixed SiOC matrix. The BET surface areas range from 215 m2/g for acetone samples to 80 m2/g for samples derived from cyclohexane solvent. The electrochemical characterization reveals a high specific reversible capacity of more than 900 mAh/g at a charging rate of C (360 mA/g) along with a good cycling stability. Samples pyrolyzed in H2/Ar atmosphere show a high reversible capacity of 200 mAh/g even at a high charging/discharging rate of 20 C. Initial capacities were recovered after whole cycling procedure indicating their structural stabilities resisting any kind of exfoliations.

show abstract

“…9 SiOC systems have been considered as electrode materials (anode) in Li-ion batteries. [10][11][12][13] However, they have not attracted wide attention as self-standing conducting materials. In general, carbon-rich polysiloxanes and other precursor additives enhance the crosslinking ability.…”

Section: Introductionmentioning

confidence: 99%

Thermal stability and electrical conductivity of carbon-enriched silicon oxycarbide

Erb

Liu

2016

J. Mater. Chem. C

View full text Add to dashboard Cite

Silicon oxycarbide (SiOC) is an interesting polymer-derived system that can be tailored to embody many different properties such as lightweight, electrochemical activity, and high temperature stability. One intriguing property that has not been fully explored is the electrical conductivity for the carbon-rich SiOC compositions. In this study, a carbon-rich SiOC system is created based on the crosslinking and pyrolysis of polyhydromethylsiloxane (PHMS) and divinylbenzene (DVB) mixed precursors. The carbonrich nature can effectively delay SiOC phase separation and crystallization into SiO 2 and SiC during pyrolysis. In an oxidizing air atmosphere, the SiOC materials are stable up to 1000 1C with o0.5 wt% weight loss. Before the onset of electrical conductivity drop at B400 1C, the material has electrical conductivity as high as 4.28 S cm À1. In an inert argon atmosphere, the conductivity is as high as 4.64 S cm À1.This new semi-conducting behavior with high thermal stability presents promising application potential for high temperature MEMS devices, protective coatings, and bulk semi-conducting components that must endure high temperature conditions.

show abstract

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

Cited by 106 publications

References 52 publications

Gradient-Hierarchic-Aligned Porosity SiOC Ceramics

Gradient-Hierarchic-Aligned Porosity SiOC Ceramics

Structural Design of Polymer‐Derived SiOC Ceramic Aerogels for High‐Rate Li Ion Storage Applications

Thermal stability and electrical conductivity of carbon-enriched silicon oxycarbide

Contact Info

Product

Resources

About