高性能粘结剂的开发是改善硅基负极循环稳定性的有效途径之一。采用化学接枝法将苯胺(ANI)小分子引入到聚丙烯酸(PAA)结构中,合成一系列不同ANI含量的PAA-ANIx复合物。通过傅里叶变换红外光谱、扫描电子显微镜、X射线光电子能谱等多种表征方法,分析并揭示了复合物的结构组成和微观形貌。然后将其作为粘结剂用于石墨掺混预锂氧化亚硅负极体系,组装成扣式半电池并进行电化学性能测试。结果表明:与PAA相比,以PAA-ANI7.5为粘结剂的硅基负极首效和循环300周容量保持率分别可提高2.01%和35.86%,而且倍率性能更加优异。这有助于推进高容量硅负极的规模化应用。
The development of high-performance binders is one of the effective ways to improve the cycling stability of silicon-based anodes.In this study,a series of polyacrylic acid-aniline (PAA-ANIx) composites were synthesized by chemically grafting ANI into the structure of PAA.Their structures,compositions and surface morphologies were characterized and analyzed by means of the Fourier-transform infrared (FT-IR) spectroscopy,scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS).Subsequently,the PAA-ANIx composites were used as binders in the mixture of graphite and pre-lithium silicon monoxide (Gr/SiOx) anode,assembled into coin-type half cells,and the corresponding electrochemical performance was tested.Th results showed that compared with PAA,the initial coulombic efficiency and capacity retention after 300 cycles of silicon-based anode with PAA-ANI7.5-Gr/SiOx as binder were increased by 2.01% and 51.06%,respectively.The rate performance was also better.This study could promote the large-scale application of silicon-based anode materials.
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基金资助
浙江省科技计划项目(2022C01160)
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