A High-Capacity and Long-Cycle-Life Lithium-Ion Battery Anode Architecture: Silver Nanoparticle-Decorated SnO2/NiO Nanotubes

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• 作者：Chanhoon Kim ; Ji-Won Jung ; Ki Ro Yoon ; Doo-Young Youn ; Soojin ParkIl-Doo Kim
• 刊名：ACS Nano
• 出版年：2016
• 出版时间：December 27, 2016
• 年：2016
• 卷：10
• 期：12
• 页码：11317-11326
• 全文大小：653K
• ISSN：1936-086X

文摘

The combination of high-capacity and long-term cyclability has always been regarded as the first priority for next generation anode materials in lithium-ion batteries (LIBs). To meet these requirements, the Ag nanoparticle decorated mesoporous SnO<sub>2sub>/NiO nanotube (m-SNT) anodes were synthesized via an electrospinning process, followed by fast ramping rate calcination and subsequent chemical reduction in this work. The one-dimensional porous hollow structure effectively alleviates a large volume expansion during cycling as well as provides a short lithium-ion duffusion length. Furthermore, metallic nickel (Ni) nanoparticles converted from the NiO nanograins during the lithiation process reversibly decompose Li<sub>2sub>O during delithiation process, which significantly improves the reversible capacity of the m-SNT anodes. In addition, Ag nanoparticles uniformly decorated on the m-SNT via a simple chemical reduction process significantly improve rate capability and also contribute to long-term cyclability. The m-SNT@Ag anodes exhibited excellent cycling stability without obvious capacity fading after 500 cycles with a high capacity of 826 mAh g<sup>–1sup> at a high current density of 1000 mA g<sup>–1sup>. Furthermore, even at a very high current density of 5000 mA g<sup>–1sup>, the charge-specific capacity remained as high as 721 mAh g<sup>–1sup>, corresponding to 60% of its initial capacity at a current density of 100 mA g<sup>–1sup>.