Synthesis of SiOx/C Composite Nanosheets As High-Rate and Stable Anode Materials for Lithium-Ion Batteries
Synthesis of SiOx/C Composite Nanosheets As High-Rate and Stable Anode Materials for Lithium-Ion Batteries
复制标题
锂离子电池高倍率稳定负极材料SiOx/C复合纳米片的合成
DOI：
10.1021/acsaem.0c00084
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发表时间：
2020-04-27
影响因子：
6.4
通讯作者：
Fu, Ruowen
中科院分区：
文献类型：
--
作者：
Chen, Luyi;Zheng, Juan;Fu, Ruowen
非化学计量比的低氧化硅（SiOx）作为替代硅的有希望的阳极材料已被定期研究。然而，SiOx固有的导电性较差，限制了其在工业上的推广。本文基于提高SiOx基材料导电性和稳定性的目的，设计并制备了一种多组分纳米片（rGO@SiOx@C）。这种渐进式设计由来自还原氧化石墨烯（rGO）的内部纳米片衬底、SiOx中间层和来自聚（乙烯基吡咯烷酮）热解的氮掺杂纳米多孔碳（NNC）壳组成。更重要的是，可控的孔结构被引入到这种二维纳米结构中，以适应在充电/放电过程中SiOx的体积变化。得益于独特的结构优势，所制备的rGO@SiOx@C纳米片具有优异的电化学性能，如高倍率性能和稳定的长寿命。我们预计，这种提高SiOx基负极材料导电性和稳定性的方法在未来锂离子电池的可持续发展中具有潜在的应用前景。
Nonstoichiometric silica suboxides(SiOx) have been regularly investigated as hopeful anode materials for the substitutions of silicon. However, the inherently poor conductivity of SiOx limits its promotion in industry. Herein, for the propose of enhanced conductivity and stability of SiOx-based materials, a kind of multicomponent nanosheet (rGO@SiOx@C) is designed and fabricated successfully. This progressive design consists of inner nanosheet substrate from reduced graphene oxide (rGO), an intermediate layer of SiOx, and a nitrogen-doped nanoporous carbon (NNC) shell from the pyrolysis of poly(vinylpyrrolidone). More importantly, the controllable pore structure is introduced into this two-dimensional nanostructure, accommodating volumetric change of SiOx during the charging/discharging process. Benefiting from unique structural advantages, the as-prepared rGO@SiOx@C nanosheets exhibit excellent electrochemical properties, such as high rate performance and stable long lifetime. We anticipate that this approach to enhance the conductivity and stability of SiOx-based anode materials has potential applications for future sustainable development in lithium-ion batteries.