A one-pot method to fabricate reduced graphene oxide (rGO)-coated Si@SiOx@β-Bi2O3/Bi composites for lithium-ion batteries

Silicon has demonstrated inordinate potential as anode material for next-generation lithium-ion batteries due to its high theoretical specific capacity. Nevertheless, the structural dilapidation during the lithiation/delithiation process has restricted its large-scope application. To conquer these challenges, we design a novel reduced graphene oxide (rGO)-coated Si@SiO x @β-Bi 2 O 3 /Bi composite by a facile one-pot method. The Bi 2 O 3 shell chiefly guarantees the structural integrity of Si-core during cyclings and synergizes with Bi nanodots to expediting Li + /e − transport kinetics. rGO mainly acts as the carrier to attaining the twofold goals of ameliorating the electronic conductivity and cushioning the stress from volume expansion. Therefore, the novel rGO-coated Si@SiO x @β-Bi 2 O 3 /Bi composite exhibits a high specific capacity of 1784 mAh g −1 at 1 A g −1 after 200 cycles and a good cycling stability of 1007 mAh g −1 at a high rate of 4 A g −1 .