Preparation and Electrochemical Properties of Novel Silicon Oxycarbonitride Anode Material
A novel silicon oxycarbonitride(SiOCN)composite is synthesized through an aldimine condensation of 3-aminopropyltriethoxysilane with formaldhyde and simultaneous hydrolysis of alkoxy,followed by subsequent thermal pyrolysis.The electrochemical performance of SiOCN as anode material is comparatively studied with the addition of a commercial electrolyte additive of fluoroethylene carbonate(FEC)and a lab-made organic fluorosilane electrolyte additive(MFSM2)in the base electrolytes.In comparison to the base electrolyte,the initial reversible capacity increases from 614.6 mA·h/g to 899.9 mA·h/g and 886.9 mA·h/g for the electrolyte with MFSM2 and FEC additive,respectively.Correspondingly,the initial coulombic efficiency increases from 58.3%to 62.2%and 62.8%.The results of cyclic voltammetry,electrochemical impedance spectroscopy,and scanning electron microscopy showed that the addition of additives reacted on the surface of the SiOCN electrode to form a stable,uniform,and dense solid electrolyte interphase,which reduced the interfacial impedance and increased the ion transport rate,thus improving the electrochemical performance of the SiOCN cell.
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