The conductivity of polymer-derived SiOCN ceramics exhibited an Arrhenius dependence on pyrolysis temperature, with the activation energy of ~3.95 eV. The formation and structure change of the free carbon phase were d...The conductivity of polymer-derived SiOCN ceramics exhibited an Arrhenius dependence on pyrolysis temperature, with the activation energy of ~3.95 eV. The formation and structure change of the free carbon phase were detected by means of electron spin resonance spectroscopy and X-ray photoelectron spectroscopy. It reveals that the number of dangling bonds on the free carbon is increased as pyrolysis temperature increases, with the activation energy of ~3.87 eV. So it is demonstrated that the pyrolysis-temperature induced increase in the conductivity is mainly attributed to the increase of dangling on the graphite-like carbon.展开更多
以3-氨丙基三乙氧基硅烷(APTES)与甲醛为原料通过烷氧基水解和席夫碱反应生成前驱体,高温热解制备硅氧碳氮(SiOCN)复合负极材料。比较研究了商用的电解液添加剂氟代碳酸乙烯酯(FEC)和自制的有机氟硅电解液添加剂(MFSM2)在SiOCN电池中的...以3-氨丙基三乙氧基硅烷(APTES)与甲醛为原料通过烷氧基水解和席夫碱反应生成前驱体,高温热解制备硅氧碳氮(SiOCN)复合负极材料。比较研究了商用的电解液添加剂氟代碳酸乙烯酯(FEC)和自制的有机氟硅电解液添加剂(MFSM2)在SiOCN电池中的电化学性能。与使用基础电解液相比,在使用MFSM2和FEC后电池可逆容量从614.6 m A·h/g分别提高至899.9 m A·h/g和886.9 m A·h/g,库仑效率从58.3%分别提高至62.2%和62.8%。循环伏安、电化学阻抗谱、扫描电子显微镜等分析结果表明,加入添加剂后在SiOCN电极表面反应形成稳定均匀致密的固体电解质界面膜,减小了界面阻抗,提高了离子传输速率,从而提高了SiOCN电池的电化学性能。展开更多
文摘The conductivity of polymer-derived SiOCN ceramics exhibited an Arrhenius dependence on pyrolysis temperature, with the activation energy of ~3.95 eV. The formation and structure change of the free carbon phase were detected by means of electron spin resonance spectroscopy and X-ray photoelectron spectroscopy. It reveals that the number of dangling bonds on the free carbon is increased as pyrolysis temperature increases, with the activation energy of ~3.87 eV. So it is demonstrated that the pyrolysis-temperature induced increase in the conductivity is mainly attributed to the increase of dangling on the graphite-like carbon.
文摘以3-氨丙基三乙氧基硅烷(APTES)与甲醛为原料通过烷氧基水解和席夫碱反应生成前驱体,高温热解制备硅氧碳氮(SiOCN)复合负极材料。比较研究了商用的电解液添加剂氟代碳酸乙烯酯(FEC)和自制的有机氟硅电解液添加剂(MFSM2)在SiOCN电池中的电化学性能。与使用基础电解液相比,在使用MFSM2和FEC后电池可逆容量从614.6 m A·h/g分别提高至899.9 m A·h/g和886.9 m A·h/g,库仑效率从58.3%分别提高至62.2%和62.8%。循环伏安、电化学阻抗谱、扫描电子显微镜等分析结果表明,加入添加剂后在SiOCN电极表面反应形成稳定均匀致密的固体电解质界面膜,减小了界面阻抗,提高了离子传输速率,从而提高了SiOCN电池的电化学性能。
