Gallium oxide particles encapsulated in carbon fiber serve as freestanding electrodes for lithium-ion batteries

As a potential electrode material for lithium-ion batteries, Ga₂O₃ has high theoretical specific capacity and low lithium storage potential. Still, the bulk expansion efficiency and poor reaction kinetics during the reaction process hinder performance improvement. This paper successfully synthesised the Ga₂O₃ NPs@CF composite electrode with network core–shell structure using the electrospinning method. Carbon coating effectively alleviates the volume expansion of Ga₂O₃ during the reaction process. The carbon fibre network structure provides more transport channels for ions, and the Ga₂O₃ NPs@CF composite electrode shows excellent performance. In the long cycle test, after 500 cycles of 0.5 A/g, the discharge capacity reached 611.04mAh/g, and the capacity retention was 99.8%. At the current density of 0.1 ~ 2A/g, after a periodic cycle, when restored to 0.1A/g, the capacity remains at a high reversible capacity of 677.8mAh/g.