Enhancing lithium storage performance by strongly binding silicon nanoparticles sandwiching between spherical graphene
Enhancing lithium storage performance by strongly binding silicon nanoparticles sandwiching between spherical graphene
复制标题
通过夹在球形石墨烯之间的强结合硅纳米颗粒来增强锂存储性能
DOI：
10.1016/j.apsusc.2020.148191
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发表时间：
2021-02
影响因子：
6.7
通讯作者：
Zhang Jiujun
中科院分区：
文献类型：
--
作者：
Liu Xiaoyu;Lu Jie;Jiang Jinlong;Jiang Yong;Gao Yang;Li Wenrong;Zhao Bing;Zhang Jiujun
为了解决硅基阳极存在的团聚、导电性差和体积膨胀等问题，通过静电层层组装和原位铝热还原法制备了一种新型的空心球形复合材料。这种精心设计的三明治结构不仅有效地抑制了硅纳米颗粒的聚集和体积膨胀，而且缩短了电子和离子的传输通道。特别地，活性Si组分和导电石墨烯基质之间的共价结合可以显著增强结构完整性并促进重复放电/充电循环期间的反应动力学。受益于多重优点，所提出的中空夹层球形结构石墨烯/Si复合电极提供超稳定的锂存储性能，在100 mA g−1下500次深充放电循环后仍具有1085.6 mAh g− 1的高容量。三明治球形结构的石墨烯/Si复合材料的显著增强的电化学性能揭示了其作为具有高能量/功率密度和超长寿命的下一代锂离子电池的有希望的阳极候选者的应用潜力。
In order to solve problematic issues of silicon-based anode such as agglomeration, poor conductivity and volumetric expansion, a novel hollow spherical composite with small-sized silicon nanoparticles sandwiching in between spherical graphene shells with chemical bonding has been constructed through electrostatic layer-by-layer assembly and subsequent in-situ aluminothermic reduction. This kind of elaborately designed sandwich structure not only inhibits aggregation and volume expansion of the silicon nanoparticles effectively, but also shorten electronic and ionic transport channels. Especially, the covalent binding between active Si component and conductive graphene matrix can significantly enhance the structural integrity and facilitate the reaction kinetics during repeated discharge/charge cycles. Benefiting from multiple merits, the proposed hollow sandwich spherical structured graphene/Si composite electrode delivers ultra-stable lithium storage performance with a high capacity of 1085.6 mAh g−1remained after 500 deep charge–discharge cycles at 100 mA g−1. The dramatically enhanced electrochemical performance of the sandwich spherical structured graphene/Si composite shed light on its application potential as the promising anode candidate for next-generation lithium ion batteries with high energy/power densities and ultra-long span life.
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