Silicon‐Rich Carbon Hybrid Nanofibers from Water‐Based Spinning: The Synergy Between Silicon and Carbon for Li‐ion Battery Anode Application
Silicon‐Rich Carbon Hybrid Nanofibers from Water‐Based Spinning: The Synergy Between Silicon and Carbon for Li‐ion Battery Anode Application
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DOI：
10.1002/celc.201300103
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发表时间：
2014-01
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通讯作者：
Yong Seok Kim;Kyung Woo Kim;Daehwan Cho;Nathaniel S. Hansen;Jinwoo Lee;Y. Joo
中科院分区：
文献类型：
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作者：
Yong Seok Kim;Kyung Woo Kim;Daehwan Cho;Nathaniel S. Hansen;Jinwoo Lee;Y. Joo
通过聚乙烯醇/Si纳米颗粒（NP）溶液的水基静电纺丝制备具有极高Si负载（>65重量%）的混合碳纳米纤维（NF），用于锂离子电池阳极应用。我们的富硅碳（SRC）NF由于具有分散的Si NP域的连续一维（1D）碳骨架结构而显示出许多促进的电荷传输特征和增加的活性。与裸硅NP相比，这导致上级电池性能。碳作为1D NF的存在不仅可以减轻硅的体积变化，而且还可以避免在硅表面上形成不稳定的固体电解质界面。关于NF中C和Si的最佳组合以改善其电化学性质和电池性能，我们的研究表明，含有72.8重量% Si（27.2重量% C）的SRC NF在Si NP的高能量容量与碳NF的尺寸稳定性和有效电荷传输之间表现出足够的平衡。 这种最佳的Si/C比导致出色的循环寿命，其保持由总电极质量归一化的1076 mAh g-1容量，以及在50次循环中约99%的库仑效率。 通过水基纺丝方法生产的这种可扩展的SRC NF可以为高性能电池阳极提供具有成本效益的开发。
Hybrid carbon nanofibers (NFs) with extremely high Si loading (>65 wt %) are fabricated through the water‐based electrospinning of polyvinyl alcohol/Si nanoparticle (NP) solutions for Li‐ion battery anode applications. Our Si‐rich carbon (SRC) NFs show many facilitated charge‐transport features and increased activities because of the continuous one‐dimensional (1D) carbon backbone structure with dispersed Si NP domains. This leads to superior battery performance compared to that of bare silicon NPs. The presence of carbon as 1D NFs can not only mitigate the volume change of silicon but also avoid the formation of an unstable solid‐electrolyte interface on the surface of silicon. Our study, regarding the optimum combination of C and Si in the NFs for their improved electrochemical properties and battery performance, reveals that SRC NFs containing 72.8 wt % Si (27.2 wt % C) exhibit an adequate balance between the high energy capacity of Si NPs and the dimensional stability and effective charge transport of carbon NFs. This optimum Si/C ratio leads to an outstanding cycle life, which maintains 1076 mAh g−1capacity normalized by the total electrode mass, and a Coulombic efficiency of about 99 % over 50 cycles. Such scalable SRC NFs produced through the water‐based spinning approach can offer a cost‐effective development for high‐performance battery anodes.