Abstract
Herein, facile synthesis of monodisperse silicon and carbon nanocomposite spheres (MSNSs) is achieved via a simple and scalable surface-protected magnesiothermic reduction with subsequent chemical vapor deposition (CVD) process. Li-ion batteries (LIBs) were fabricated to test the utility of MSNSs as an anode material. LIB anodes based on MSNSs demonstrate a high reversible capacity of 3207 mAh g−1, superior rate performance, and excellent cycling stability. Furthermore, the performance of full cell LIBs was evaluated by using MSNS anode and a LiCoO2 cathode with practical electrode loadings. The MSNS/LiCoO2 full cell demonstrates high gravimetric energy density in the order of 850 Wh L−1 with excellent cycling stability. This work shows a proof of concept of the use of monodisperse Si and C nanocomposite spheres toward practical lithium-ion battery applications.
Highlights
Other doped Si materials, which require very expensive raw materials and high processing cost
The monodisperse silicon and carbon nanocomposite spheres (MSNSs) is obtained via a facile surface-protected magnesiothermic reduction process with subsequent chemical vapor deposition
To better understand the charge transfer and ion transfer mechanism of the MSNS anodes, electrochemical impedance spectroscopy (EIS) measurements were conducted for ten consecutive cycles for MSNS based anode half cells under the fully charged state
Summary
Other doped Si materials, which require very expensive raw materials and high processing cost Another detrimental factor that limits the application of porous and nano silicon anodes in full cell applications is its high surface area. The MSNS/ LiCoO2 full cell is operated between 3.3 and 4.3 V delivers a high reversible capacity of 3.52 mAh cm−2, with a measured high energy density on the order of 850 Wh/L with the consideration of both cathodes and anodes. This value can be further boosted by optimizing the electrode structure and cell balancing. We believe this MSNS design could open new opportunities in high energy density LIBs
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