Modification of nanosized LiFePO4 via nickel doping and graphene coating. (23rd May 2019)

• Record Type: Journal Article
• Authors: Hang, La Thi; Anh, Nguyen Thi My; Tru, Nguyen Nhi; Nguyen, Huynh Le Thanh; Phung, Le My Loan
• Is Part Of: International journal of nanotechnology. Volume 15:Number 11/12(2018)
• Page Start: 914
• Page End: 924
• Publication Date: 2019-05-23
• Subjects: LiFePO4 -- LiFe1-xNixPO4 -- graphene -- solvothermal -- specific capacity -- Li-ion batteries; 620.505
• Languages: English
• ISSNs: 1475-7435

Abstract

In this study, LiFe1-x Nix PO4 and LiFe1-x Nix PO4 /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-x Nix PO4 /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-x Nix PO4 and LiFe1-x Nix PO4 /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-x Nix PO4 /graphene was in range of 120-145 mAh/g and remained nearly 80% efficient after 20th cycles.