Modification of nanosized LiFePO4 via nickel doping and graphene coating Online publication date: Tue, 28-May-2019
by La Thi Hang; Nguyen Thi My Anh; Nguyen Nhi Tru; Huynh Le Thanh Nguyen; Le My Loan Phung
International Journal of Nanotechnology (IJNT), Vol. 15, No. 11/12, 2018
Abstract: In this study, LiFe1-xNixPO4 and LiFe1-xNixPO4/graphene (LFNP/Gr) composites were synthesised via solvothermal route. The phase structure was characterised by X-ray diffraction (XRD) and energy dispersive X-ray spectroscopy (EDS). The graphene coating was confirmed by Raman spectroscopy; the particle morphology and size were defined through SEM and TEM images observation. The expected material design was given with nickel doping and graphene coating process. Particle size of the synthesised LiFe1-xNixPO4/graphene was proved to be reduced from 400 nm to approx. 40 nm comparing to the pristine LFP. Meanwhile, the nickel doping and graphene coating gave a significant increase of conductivity for LiFe1-xNixPO4 and LiFe1-xNixPO4/graphene as 2 × 10-3 and 1.5 × 10-2 S/cm respectively, comparing to pristine LiFePO4(10-6 S/cm). The discharge capacity of LiFe1-xNixPO4/graphene was in range of 120-145 mAh/g and remained nearly 80% efficient after 20th cycles.
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