摘要
不同的碳源前驱体由于其在热解过程中的分解产物、残碳量以及聚合程度不同,导致了最终热解碳性能各异,其差异会对碳包覆的SiO复合材料的性能产生影响。采用热解法,分别以高温煤沥青和酚醛树脂为前驱体对SiO进行表面碳包覆,并对包覆后得到的SiO/C复合材料进行电化学性能测试和物理性能分析,结果表明:以高温煤沥青为前驱体得到的SiO/C复合材料表面包覆层均匀完整,电化学性能较为优异,在0.05C下首次可逆比容量可达1563.9 mAh/g,首次库仑效率为83.05%,相比之下,酚醛树脂包覆的SiO/C复合材料首次可逆比容量和首次效率仅为1355 mAh/g和75.75%。
In order to study the influence of different kind of carbon on the SiO/C composite materials,high temperature coal tar pitch and phenolic resin were used as raw materials to produce carbon coated SiO materials due to the difference on decomposition product,carbon residue and the degree of polymerization of these two organics.The obtained samples were characterized by X-ray diffraction(XRD),Transmission Electron Microscope(TEM)and Thermogravimetric Analysis(TG)in addition to as well as a series of electrochemical examination.Results show that the high temperature coal tar as the precursor of the SiO/C composite material surface cladding layer is complete,the electrochemical performance is relatively good,under 0.05 C for the first time the reversible specific capacity can reach 1563.9 mAh/g,the coulomb efficiency is 83.05%,for the first time,by contrast,the phenolic resin coated the SiO/C composite material for the first time the reversible specific capacity and efficiency for the first time are 1355 mAh/g and 75.75%.
作者
唐其伟
王丽
TANG Qi-wei;WANG Li(Suzhou Youlion Battery Co.,Ltd.,Suzhou Jiangsu 215500,China)
出处
《电源技术》
CAS
北大核心
2020年第5期657-659,665,共4页
Chinese Journal of Power Sources
关键词
锂离子电池
负极
硅碳复合材料
lithiumion battery
anode
silicon/carbon composite
