Abstract
? 2022 Elsevier B.V.Silicon suboxide (SiOx, 0 <x < 2) is regarded as one of the most prospective anode materials for high-energy-density lithium-ion battery. However, its large-scale application is impeded due to the sluggish electrode reaction kinetics and fast capacity degradation arising from its low conductivity and severe structural degradation. Herein, we reported a lithium silicate (LS) nanodots decorated SiOx-C/graphene material prepared by a facile sol-gel approach with subsequent heat-treatment. The highly-dispersed LS nanodots and graphene sheets provide the fast Li-ion and electron transport for SiOx electrode and therefore enhancing the electrode reaction kinetics of SiOx-C@LS/graphene (SCL-G) electrode. Meanwhile, the highly-conductive network homogenizes the local current density and electrode reactions, which renders homogeneous volume variation and mitigates structural stress of SiOx, resulting in excellent structural durability during repeated cycles. Owing to the synergistic effects, the SCL-G electrode delivered a reversible capacity of 400 mAh g?1 at 0.5 A g?1 without obvious capacity degradation for 200 cycles.
NSTL
Elsevier