Facile synthesis of hybrid pitch-based soft carbon as high-performance silicon/carbon anodes for lithium-ion batteries

Silicon-based materials have been facing problems such as large volume change and poor electrical conductivity, which seriously hinder their large-scale production. Modification with carbon materials is considered to be an effective method to improve electrochemical performance. In this work, we pre...

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Bibliographic Details
Published in:Ionics 2022-08, Vol.28 (8), p.3709-3718
Main Authors: Liu, Zetao, Du, Juntao, Jia, Huina, Wang, Wenchao, Zhang, Minxin, Li, Tianjin, Nie, Yi, Liu, Tianqing, Song, Kedong
Format: Article
Language:English
Subjects:
Anodes
Carbon
Chemistry
Chemistry and Materials Science
Condensed Matter Physics
Current density
Electrical resistivity
Electrochemical analysis
Electrochemistry
Energy Storage
Graphitization
High current
Ion transport
Lamellar structure
Lithium-ion batteries
Mixing ratio
Nanoparticles
Optical and Electronic Materials
Original Paper
Rechargeable batteries
Renewable and Green Energy
Silicon
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Summary:Silicon-based materials have been facing problems such as large volume change and poor electrical conductivity, which seriously hinder their large-scale production. Modification with carbon materials is considered to be an effective method to improve electrochemical performance. In this work, we prepare silicon/pitch-based soft carbon (SMP) composite with ordered lamellar structures through a simple and scalable method. The microstructure of SMP composite can be effectively regulated by selecting different kinds of pitch-based soft carbon (mesophase pitch and refined pitch) and adjusting the mixing ratio with silicon nanoparticles. Finally, the optimized SMP composite has an ordered lamellar structure with higher degree of graphitization, which can effectively accommodate the volume change of silicon nanoparticles and provide a fast lithium-ion transport channel, exhibiting excellent cycling performance at high current density and rate capability. The SMP composite delivers a reversible capacity of 527 mA h g −1 after 100 cycles at 0.2 A g −1 and retains 510 mA h g −1 at high current density of 1 A g −1 . In addition, the SMP composite exhibits good rate performance, delivering reversible capacities of about 387 mA h g −1 at a current density of 2 A g −1 . The present work provides a reference for the large-scale application of pitch to silicon/carbon anodes. Graphical abstract
ISSN:0947-7047
1862-0760
DOI:10.1007/s11581-022-04591-7