硅氧碳氮新型硅负极材料的制备及其电化学性能  

Preparation and Electrochemical Properties of Novel Silicon Oxycarbonitride Anode Material

作　　者：钟琪[1,2,3,4] 余德馨 赵欣悦[2,3,4] 傅儒生 张灵志[1,2,3,4] ZHONG Qi;YU Dexin;ZHAO Xinyue;FU Rusheng;ZHANG Lingzhi(School of Energy Science and Engineering,University of Science and Technology of China,Guangzhou 510640,China;Guangzhou Institute of Energy Conversion,Chinese Academy of Sciences,Guangzhou 510640,China;CAS Key Laboratory of Renewable Energy,Guangzhou 510640,China;Guangdong Provincial Key Laboratory of Renewable Energy,Guangzhou 510640,China;Guangdong Kaijin New Energy Technology Co.Ltd.,Dongguan 523808,Guangdong,China)

机构地区：[1]中国科学技术大学能源科学与技术学院,广州510640 [2]中国科学院广州能源研究所,广州510640 [3]中国科学院可再生能源重点实验室,广州510640 [4]广东省可再生能源重点实验室,广州510640 [5]广东凯金新能源科技股份有限公司,广东东莞523808

出　　处：《新能源进展》2024年第5期542-547,共6页Advances in New and Renewable Energy

基　　金：东莞市重点领域研发项目(2022120030012);中科院科技服务网络计划(STS)东莞专项项目(20211600200331)。

摘　　要：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。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.

关 键 词：锂离子电池 硅氧碳氮 氟硅烷 电解液添加剂 

分 类 号：TK02[动力工程及工程热物理]