Title: Modification of nanosized LiFePO4 via nickel doping and graphene coating

Authors: La Thi Hang; Nguyen Thi My Anh; Nguyen Nhi Tru; Huynh Le Thanh Nguyen; Le My Loan Phung

Addresses: General Faculty, Vinh Long University of Technology Education, 73 Nguyen Hue, Ward 2, Vinh Long, 890000, Vietnam; Institute of Applied Materials Science – VAST, 1 Mac Dinh Chi, District 1, HCM City 700000, Vietnam ' Faculty of Materials Technology – VNU HCM, 268 Ly Thuong Kiet, District 10, HCM City 700000, Vietnam ' Faculty of Materials Technology – VNU HCM, 268 Ly Thuong Kiet, District 10, HCM City 700000, Vietnam ' Applied Physical Chemistry Lab – VNU HCM, 227 Nguyen Van Cu, District 5, HCM City 700000, Vietnam ' Applied Physical Chemistry Lab – VNU HCM, 227 Nguyen Van Cu, District 5, HCM City 700000, Vietnam

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.

Keywords: LiFePO4; LiFe1-xNixPO4; graphene; solvothermal; specific capacity; Li-ion batteries.

DOI: 10.1504/IJNT.2018.099931

International Journal of Nanotechnology, 2018 Vol.15 No.11/12, pp.914 - 924

Available online: 23 May 2019 *

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