期刊
ACS APPLIED MATERIALS & INTERFACES
卷 13, 期 13, 页码 15216-15225出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.1c00107
关键词
Li-ion batteries; Si anode materials; carbon coating layer; lignin; graded protective layer
资金
- National Natural Science Foundation of China [51902165]
- Program of High-Level Talents in Six Industries of Jiangsu Province [XCL-040]
- Jiangsu Specially-Appointed Professor Program
A facile method was developed to introduce a graded protective sheath onto the surface of silicon nanoparticles, resulting in improved performance in lithium-ion batteries. The protective sheath is composed of NiSi2, SiC, and C from the interior to the exterior, ensuring excellent compatibility between neighboring components. The nanocomposite exhibits high reversible specific capacity, excellent rate capability, and superior cyclability, attributed to a slight volumetric expansion, high Li+ ion diffusion coefficients, good interface stability, and fast electrochemical kinetics.
Silicon is one of the most promising anode materials for lithium-ion batteries, whereas its low electronic conductivity and huge volumetric expansion upon lithiation strongly influence its prospective applications. Herein, we develop a facile method to introduce a graded protective sheath onto the surface of Si nanoparticles by utilizing lignin as the carbon source and Ni(NO3)(2) as the auxiliary agent. Interestingly, the protective sheath is composed of NiSi2, SiC, and C from the interior to the exterior, thereby guaranteeing excellent compatibility between the neighboring components. Thanks to this unique coating layer, the obtained nanocomposite delivers a large reversible specific capacity (1586.3 mAh g(-1) at 0.2 A g(-1)), excellent rate capability (879.4 mAh g(-1) at 5 A g(-1)), and superior cyclability (88.2% capacity retention after 500 cycles at 1 A g(-1)). Such great performances are found to derive from a slight volumetric expansion, high Li+ ion diffusion coefficients, good interface stability, and fast electrochemical kinetics. These properties are obviously superior to those of their counterparts, benefiting from the interface engineering. This study offers new insights into constructing high-capacity and long-durable electrode materials for energy storage.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据