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Silicon (Si) has gained popularity as a potential anodic material for Li-ion batteries (LIBs) due to its large theoretical capacity. However, low conductivity, large volume expansion, and side reactions during alloying and de-alloying lead to poor cyclic and bad high-rate performance, which has severely hindered its practical large-scale application. Herein, a novel stamen-structured Si-based anode material with a protective SiOx layer and dual carbon layers (Si@SiOx/C@C) is designed for high-performance LIBs. The protective SiOx layer reduces side reactions and dual carbon layers enhance charge transport to improve reaction kinetics, while the unique structure provides buffering space for volume expansion. Such Si@SiOx/C@C anode demonstrates impressive Li storage properties for a half-battery, including a discharge capacity of 2935 mA h g−1 at a current density 0.1 A g−1, cyclic performance (814 mA h g−1 at 2 A g−1 over 500 cycles and 988 mA h g−1 over 200 cycles at 1 A g−1) and a rate performance (609 mA h g−1 at 5 A g−1). It also maintains a high reversible capacity of 131 mA h g−1 at 0.25 C after 100 cycles for a full battery. This work provides insights into the novel design of multiple protective layers on Si-based anode materials for fast-charging and highly stable LIBs. © 2025 Science Press
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Journal of Energy Chemistry
ISSN: 2095-4956
Year: 2025
Volume: 110
Page: 466-475
1 4 . 0 0 0
JCR@2023
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