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Silicon Microparticle Anodes with Self-Healing Multiple Network Binder
Joule ( IF 39.8 ) Pub Date : 2018-03-12 , DOI: 10.1016/j.joule.2018.02.012
Zhixin Xu , Jun Yang , Tao Zhang , Yanna Nuli , Jiulin Wang , Shin-ichi Hirano

Si has been regarded as a promising anode material for Li-ion batteries. However, its dramatic volume change during cycling poses formidable challenges to building stable electrodes. Since Si microparticles (SiMPs) can easily cause the pulverization and loss of electronic contact, many previous works were focused on porous-structured, nanostructured, or hierarchically structured silicon materials to improve the cycle stability. However, their low-cost and mass production is mostly difficult or even impossible. Herein, a water-soluble polymer binder, poly(acrylic acid)-poly(2-hydroxyethyl acrylate-co-dopamine methacrylate), is designed and synthesized. It shows better wettability to liquid electrolyte than poly(acrylic acid). Moreover, its multiple network structure with rigid-soft chains and bonds, and special self-healing capability in situ formed during the electrode preparation, not only provides enough mechanical support but also buffers the strain caused by the volume change of SiMPs. Thus, the cycle stability and rate performance are remarkably improved under high reversible capacity or electrode loading.



中文翻译:

具有自我修复功能的多个网络粘合剂的硅微粒阳极

Si被认为是锂离子电池的有希望的负极材料。然而,其在循环过程中的巨大体积变化对构建稳定的电极提出了巨大的挑战。由于硅微粒(SiMPs)容易引起粉化和失去电子接触,因此许多以前的工作集中在多孔结构,纳米结构或分层结构的硅材料上,以提高循环稳定性。然而,它们的低成本和大规模生产通常是困难的,甚至是不可能的。在此,设计并合成了水溶性聚合物粘合剂聚(丙烯酸)-聚(丙烯酸2-羟乙酯-甲基丙烯酸多巴胺)。与聚丙烯酸相比,它对液体电解质的润湿性更好。此外,它的多网络结构具有刚性-软性的链和键,并具有特殊的自我修复能力电极制备过程中原位形成,不仅提供了足够的机械支撑,而且还缓冲了由于SiMP体积变化而引起的应变。因此,在高可逆容量或电极负载下,循环稳定性和速率性能得到显着改善。

更新日期:2018-03-12
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