期刊
RARE METALS
卷 40, 期 6, 页码 1347-1356出版社
NONFERROUS METALS SOC CHINA
DOI: 10.1007/s12598-021-01716-1
关键词
Silicon@carbon composites; Anode; Nitrogen; phosphorus co-doped carbon; Lithium-ion battery
资金
- National Natural Science Foundation of China [52072323, 21805278, 51872098]
- Leading Project Foundation of Science Department of Fujian Province [2018H0034]
- Double-First Class Foundation of Materials and Intelligent Manufacturing Discipline of Xiamen University
- Opening Project of National Joint Engineering Research Center for Abrasion Control and Molding of Metal Materials
- Henan Key Laboratory of High-temperature Structural and Functional Materials, Henan University of Science and Technology [HKDNM2019013]
By utilizing a double carbon synergistic encapsulation strategy, researchers have successfully developed a 2D NPC/C@Si electrode with excellent cycling stability and capacity retention, demonstrating high reversible capacity and outstanding rate capability.
Silicon (Si) is a promising anode candidate for next-generation lithium-ion batteries (LIBs), but it suffers from poor electronic conductivity and dramatic volume variation during cycling, which poses a critical challenge for stable battery operation. To mitigate these issues simultaneously, we propose a double carbon synergistic encapsulation strategy, namely thin carbon shell and nitrogen/phosphorus co-doped two-dimensional (2D) carbon sheet dual encapsulate Si nanoparticles (denoted as 2D NPC/C@Si). This double carbon structure can serve as a conductive medium and buffer matrix to accommodate the volume expansion of Si nanoparticles and enable fast electron/ion transport, which promotes the formation of a stable solid electrolyte interphase film during cycling. Through structural advantages, the resulting 2D NPC/C@Si electrode demonstrates a high reversible capacity of 592 mAh center dot g(-1) at 0.2 A center dot g(-1) with 90.5% excellent capacity retention after 100 cycles, outstanding rate capability (148 mAh center dot g(-1) at 8 A center dot g(-1)), and superior long-term cycling stability (326 mAh center dot g(-1) at 1 A center dot g(-1) for 500 cycles, 86% capacity retention). Our findings elucidate the development of high-performance Si@C composite anodes for advanced LIBs.
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