Confined Synthesis of FeS2 Nanoparticles Encapsulated in Carbon Nanotube Hybrids for Ultrastable Lithium-Ion Batteries

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• 作者：Lei Xu ; Yanjie Hu ; Haoxuan Zhang ; Hao Jiang ; Chunzhong Li
• 刊名：ACS Sustainable Chemistry & Engineering
• 出版年：2016
• 出版时间：August 1, 2016
• 年：2016
• 卷：4
• 期：8
• 页码：4251-4255
• 全文大小：361K
• 年卷期：0
• ISSN：2168-0485

文摘

To address the large volume change and polysulfide dissolution of FeS₂-based materials for lithium-ion batteries (LIBs), we demonstrate the synthesis of FeS₂ nanoparticles encapsulated in carbon nanotubes (CNTs) by a confined reaction. There is sufficient void space between adjacent FeS₂ nanoparticles for guaranteeing the highly structural integrity. The resultant FeS₂/CNT hybrids, when served as anode materials for LIBs, predictably exhibit a very stable capacity retention of 800 mAh g^–1 over 200 cycles at 200 mA g^–1. Even at 2000 mA g^–1, they still deliver high-rate and long-life performance with a high specific capacity of 525 mAh g^–1 after 1000 cycles. Such a kind of encapsulated structure is helpful for enhancing rate capability and cycling stability in LIBs applications. Importantly, the present confined reaction strategy can be extensively applied to synthesize other analogous hybrids for energy storage and conversion.