期刊
RSC ADVANCES
卷 10, 期 63, 页码 38524-38531出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0ra07029g
关键词
-
资金
- National Natural Science Foundation of China [51821005, 21975087, U1966214, 51902116]
To achieve superior lithium storage performance, SiOx is usually designed into nanostructured SiOx/C composites by complex or expensive methods. Here, micron-sized interconnected SiOx/N-doped carbon (NC) microspheres composed of evenly dispersed SiOx nano-domains and NC have been fabricated by a scalable microemulsion method and following pyrolysis, using vinyltriethoxysilane and chitosan as precursors. The unique structure of the micron-sized SiOx/NC spheres leads to enhanced structural integrity and enables stable long-term cycling (800 cycles at 2 A g(-1)). Benefiting from the enhanced electron/Li+ diffusion kinetics originated from the unique structure and N-doping, SiOx/NC-2 presents considerable capacitive-controlled Li storage capacity, which leads to outstanding rate capability. Consequently, the assembled SiOx/NC-2//LiFePO4 full cell exhibits superior rate capability (106 mA h g(-1) at 4C) and stable long-term cycling at 2C (102 mA h g(-1) after 350 cycles). This work opens a new door for the application of chitosan in building micron-sized high-performance SiOx/C anode materials, and to some extent facilitates the recycling of waste seafood shells.
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