NiGa 2 O 4 /rGO Composite as Long-Cycle-Life Anode Material for Lithium-Ion Batteries.

ACS applied materials & interfaces(2019)

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摘要
This work reports a novel Ga-based material, NiGaO, which is typically used as a photo-catalyst for water splitting, as anode for LIB with long cycling life. High surface area rGO has been used as the conductive substrate to avoid the segregation of NiGaO nanoparticles (NPs). Because the size and the shape of NiGaO is very sensitive to the pH of the precursor, ethylene glycol has been employed as the solvent, as well as the reduction agent to reduce GO, in order to avoid using extra surfactants and also to avoid the variation of pH of the precursor. The obtained NiGaO/rGO composite possesses high capacity and long cycling life (2000 cycles, 2 A/g), with NiGaO NPs around 3-4 nm that uniformed distributed on rGO surface. Full cell performance with LiCoO as cathode has also been studied, with the average loss of 0.04% per cycle after 200 cycles (C/2 of LiCoO). The long cycling life of the composite was ascribed to the self-healing feature of Ga0 formed during charging.
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关键词
gallium,self-healing,NiGa2O4,lithium-ion batteries,rGO
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