SiOx encapsulated FeSi2-Si eutectic nanoparticles as durable anode of lithium-ion batteries

Low-cost and high-efficiency production of silicon-based material is the key to improve the energy density of lithium-ion batteries. Herein, we propose a novel structure of FeSi2-Si eutectic nanoparticles protected by the SiOx shell. FeSi2, as a buffer phase can improve the electrochemical stability of the electrode. A SiOx shell is formed on the surface of the nanoparticles through the passivation process. SiOx encapsulated FeSi2-Si eutectic nanoparticles exhibit excellent capacity of 674.9 mAh/g after 500 charge/ discharge cycles. The capacity retention rate is above 90% after the stabilization process. This work provides a new nanomaterial design for high performance silicon-based anode materials of lithium-ion batteries. (c) 2021 Elsevier Ltd. All rights reserved.

Automated summary

The study introduces a novel structure of FeSi2-Si eutectic nanoparticles protected by SiOx shell, demonstrating excellent electrochemical performance and providing a new approach for the design of high-performance silicon-based anode materials for lithium-ion batteries.