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A Nanocomposite of Si@C Nanosphere and Hollow Porous Co9S8/C Polyhedron as High‐Performance Anode for Lithium‐Ion Battery
ChemElectroChem ( IF 3.5 ) Pub Date : 2020-10-07 , DOI: 10.1002/celc.202001052 Chao Yuan 1 , Dujiang Lu 1 , Yongling An 1 , Xiufang Bian 2
ChemElectroChem ( IF 3.5 ) Pub Date : 2020-10-07 , DOI: 10.1002/celc.202001052 Chao Yuan 1 , Dujiang Lu 1 , Yongling An 1 , Xiufang Bian 2
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Silicon (Si) is regarded as one of the most promising anode materials for lithium‐ion batteries (LIBs) due to its high capacity and low working voltage. However, dramatic volume expansion and inferior electrical conductivity greatly impede the commercial use of Si anodes. Herein, we design and synthesize a novel nanocomposite of Si nanosphere coated by carbon (Si@C) and hollow porous Co9S8/C polyhedron (Si@C−Co9S8/C). The hollow porous Co9S8/C derived from Co‐based zeolitic imidazolate framework can serve as a buffering matrix to accommodate the volume expansion of Si, which is beneficial to improve the cycle performance. The vast conductive carbon layer originated from Co9S8/C and Si@C plays a key role in accelerating the electron transfer and lithium ion transport kinetics, which can significantly enhance the rate performance. As a result, the Si@C−Co9S8/C anodes deliver stable cycle performance with a reversible capacity of 1399 mA h g−1 after 200 cycles at 100 mA g−1, improved rate performance and high Coulombic efficiency. This simple route sheds light on designing Si‐based composites for LIBs anodes.
中文翻译：
Si @ C纳米球和空心多孔Co9S8 / C多面体的纳米复合材料，作为锂离子电池的高性能阳极
硅（Si）由于其高容量和低工作电压而被认为是锂离子电池（LIB）最有希望的负极材料之一。然而，巨大的体积膨胀和较差的电导率极大地阻碍了硅阳极的商业使用。本文中，我们设计并合成了一种新型的纳米碳纳米复合材料，该纳米复合材料由碳（Si @ C）和中空多孔Co 9 S 8 / C多面体（Si @ C-Co 9 S 8 / C）包覆。源自Co基沸石咪唑酸盐骨架的中空多孔Co 9 S 8 / C可以用作缓冲基质以容纳Si的体积膨胀，这有利于改善循环性能。巨大的导电碳层起源于钴9 S 8 / C和Si @ C在加速电子转移和锂离子迁移动力学中起关键作用，这可以显着提高速率性能。其结果是，所述Si @ C-钴9小号8 / C阳极提供稳定的循环性能的1399毫安ħg的可逆容量-1在100mA克200次循环后-1，改进率性能和高库仑效率。这种简单的方法为LIB阳极的硅基复合材料的设计提供了启示。
更新日期：2020-11-03
中文翻译：
Si @ C纳米球和空心多孔Co9S8 / C多面体的纳米复合材料，作为锂离子电池的高性能阳极
硅（Si）由于其高容量和低工作电压而被认为是锂离子电池（LIB）最有希望的负极材料之一。然而，巨大的体积膨胀和较差的电导率极大地阻碍了硅阳极的商业使用。本文中，我们设计并合成了一种新型的纳米碳纳米复合材料，该纳米复合材料由碳（Si @ C）和中空多孔Co 9 S 8 / C多面体（Si @ C-Co 9 S 8 / C）包覆。源自Co基沸石咪唑酸盐骨架的中空多孔Co 9 S 8 / C可以用作缓冲基质以容纳Si的体积膨胀，这有利于改善循环性能。巨大的导电碳层起源于钴9 S 8 / C和Si @ C在加速电子转移和锂离子迁移动力学中起关键作用，这可以显着提高速率性能。其结果是，所述Si @ C-钴9小号8 / C阳极提供稳定的循环性能的1399毫安ħg的可逆容量-1在100mA克200次循环后-1，改进率性能和高库仑效率。这种简单的方法为LIB阳极的硅基复合材料的设计提供了启示。
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