Hollow Si nanospheres with amorphous TiO2 layer used as anode for high-performance Li-ion battery

被引:27
作者
Jiao, Xiang-Wei [1 ,2 ]
Tian, Yan-Hong [1 ,2 ]
Zhang, Xue-Jun [1 ,2 ]
机构
[1] Beijing Univ Chem Technol, State Key Lab Organ Inorgan Composites, Beijing 100029, Peoples R China
[2] Beijing Univ Chem Technol, Key Lab Carbon Fiber & Funct Polymers, Minist Educ, North Third Ring Rd 15, Beijing 100029, Peoples R China
关键词
Hollow structure; Core-shell structure; Si anode material; Amorphous TiO2; SILICON ANODES; ELECTRODES; CARBON; EVOLUTION;
D O I
10.1016/j.apsusc.2021.150682
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
This work introduces a novel, nanostructured Si-based material comprised of hollow Si spheres encapsulated in an amorphous TiO2 layer (FIN-Si@aTiO(2)). The HN-Si@aTiO(2) is prepared by magnesiothermic reduction and solgel methods. As an anode material, the composite exhibits high capacity performance and enhanced cycling stability. When tested at a current density of 1 A g(-1) , the nanocomposite achieves a high initial specific capacity of 2804.6 mA h g(-1) with a high initial coulombic efficiency of 78.47% and its discharge capacity is 1196.3 mA h g(-1) after 100 cycles. Meanwhile, the HN-Si@aTiO(2) electrode exhibits high capacity performance with 524.6 mA h g(-1) even after 500 cycles at 5 A g(-1) . The outstanding cycling stability of HN-Si@aTiO(2) is attributed to its hollow core-shell nanostructure. The hollow structure of the anode material provides space for volumetric change of the silicon core, while the amorphous TiO2 coating layer maintains the integrity of the electrode material. Therefore, HN-Si@aTiO(2) nanocomposites have great prospects as next-generation lithium-ion anode materials owing to their outstanding electrochemical performance and scalable synthesis methods.
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页数:7
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