石墨
材料科学
电极
硅
电解质
复合数
化学工程
介电谱
锂(药物)
X射线光电子能谱
衰减全反射
复合材料
傅里叶变换红外光谱
电化学
化学
物理化学
冶金
内分泌学
工程类
医学
作者
Xiuyun Zhao,Chae-Ho Yim,Naiying Du,Yaser Abu-Lebdeh
标识
DOI:10.1021/acs.iecr.8b01055
摘要
Dextran was evaluated as a binder material for graphite electrode, silicon electrode, and Si/graphite composite electrode in Li-ion cells. The performance was also compared with poly(vinylidene fluoride) (PVDF) binder or lithium salt of poly(acrylic acid) (LiPAA) binder. A graphite-rich Si/graphite composite electrode shows a reversible capacity of about 525 mAh g–1 at a C/5 rate and has an excellent cycling stability. An interface study using impedance spectroscopy, X-ray photoelectron spectroscopy, and postmortem scanning electron microscopy analysis shows that the superior performance is due to the formation of a solid–electrolyte interface (SEI) layer that completely covers the surfaces of silicon and graphite. This could be attributed to a strong interaction between dextran through the shortly branched one-dimensional structure and silicon surface as evidenced by attenuated total reflection–infrared spectroscopy. This along with its low cost and environmentally friendly nature makes it an attractive binder material for Si/graphite composite electrodes in Li-ion batteries.
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