|About this Abstract
|Materials Science & Technology 2020
|Late News Poster Session
|Silicon Carbon Nitride (SiCN) and Silicon Oxycarbide (SiOC) Functionalization of Molybdenum Disulfide (MoS2) as Stable Battery Electrodes
|Davi Marcelo Soares, Gurpreet Singh
|On-Site Speaker (Planned)
|Davi Marcelo Soares
A facile process is demonstrated for the synthesis of layered polymer-derived ceramic (PDC)-MoS2 via pyrolysis of polysilazane and polysiloxane functionalized MoS2 flakes. The layered morphology and polymer to ceramic conversion on MoS2 surfaces is confirmed by transmission electron microscopy (TEM) and spectroscopic techniques. Tested as anode material for lithium- and sodium-ion batteries half-cell, MoS2-SiCN showed the classical three-stage reaction with improved cycling stability and capacity retention than pristine MoS2. Contribution of conversion reaction of alkali-metal ion/TMD system on overall capacity was marginally affected by the presence of SiCN or SiOC while reaction-irreversibility arising from electrolyte decomposition was greatly suppressed. This is understood as one of the reasons for decreased first cycle loss and increased capacity retention. In sum, our results suggest that molecular level interfacing with precursor–derived ceramic is an effective strategy for suppressing the polysulfide and metal-sulfide/electrolyte degradation reaction at low discharge potentials.