Integrating transition metal into silicon/carbon anodes towards enhanced lithium storage

For lithium storage, the integration of transition metal into silicon/carbon anodes is very effective in im-proving the overall electrochemical performance of Si-based anodes. Herein, a hydrogel-derived pyrolysis route has been developed for uniformly integrating FeCo alloy into Si/graphene anodes, yielding homo-geneous Si-M-C ternary materials. Specifically, particle-assembled FeCo alloy nanocube and commercial Si nanoparticle are uniformly immobilized within gel-derived graphene matrix, which is beneficial for fully realizing the hybridization merits from M/C dual matrices toward Si anodes. As a result, the Si/FeCo@G ternary framework exhibits higher initial Coulombic efficiency, long-term cycling stability (974 mA h g-1 after 100 cycles at 0.5 A g-1), and good rate performance (718 and 417 mA h g-1 at 5 and 10 A g-1, re-spectively).(c) 2022 Elsevier B.V. All rights reserved.

Automated summary

A hydrogel-derived pyrolysis route has been developed to uniformly integrate FeCo alloy into Si/graphene anodes, resulting in Si-M-C ternary materials with improved electrochemical performance. The Si/FeCo@G ternary framework exhibited higher initial Coulombic efficiency, long-term cycling stability, and good rate performance.