材料科学
阳极
硅
锂(药物)
电化学
纳米颗粒
碳纤维
纳米技术
金属有机骨架
化学工程
光电子学
电极
有机化学
物理化学
复合材料
复合数
吸附
内分泌学
工程类
化学
医学
作者
Runsheng Gao,Jie Tang,Xiaoliang Yu,Shuai Tang,Kiyoshi Ozawa,Taizô Sasaki,Lu‐Chang Qin
出处
期刊:Nano Energy
[Elsevier]
日期:2020-04-01
卷期号:70: 104444-104444
被引量:99
标识
DOI:10.1016/j.nanoen.2019.104444
摘要
Silicon (Si) has been broadly investigated as a promising anode in lithium-ion batteries (LIBs). However, there is still a problem that the alloying reactions of Si and Li often cause structural failures and rapid degradation in capacity of the electrode. Herein, an in-situ encapsulation of Si nanoparticles forming metal-organic-framework (MOF) derived carbon shells has been developed to improve the performance and retain the structural integrity of the electrode. Using this strategy, a compact and robust interface was ensured between the Si nanoparticles and carbon shell while also reducing the unnecessary exposing areas simultaneously. Moreover, the pores in the MOF-derived carbon shells offered good channels for Li-ion penetration and diffusion. The resulted composite electrode exhibited excellent electrochemical performance and delivered a capacity of 3714 mAh g−1 at 200 mA g−1, and an outstanding reversible capacity of 820 mAh g−1 at 5000 mA g−1 even after 1000 cycles, Direct comparison between the encapsulated Si and naked Si revealed the significance of the MOF-derived carbon shells and its great potential for the next-generation high capacity LIBs.
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