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- Title
LiFePO batteries with enhanced lithium-ion-diffusion ability due to graphene addition.
- Authors
Nguyen, Van; Gu, Hal-Bon
- Abstract
In this study, graphene was added to LiFePO via a hydrothermal method to improve the lithium-ion-diffusion ability of LiFePO. The influence of graphene addition on LiFePO was studied by X-ray diffraction (XRD), field emission scanning electron microscopy, transmission electron microscopy, cyclic voltammetry, cycling test, and AC impedance analysis. The addition of graphene to LiFePO resulted in the formation of a LiFePO-graphene composite; XRD observations revealed the composite to have a single phase with an olivine-type structure. Furthermore, LiFePO particles in the composite were stacked on the graphene sheet surface, thereby enabling the composite to form an effective conducting network and facilitate the penetration of the surface of active materials by an electrolyte. The lithium-ion-diffusion ability of the LiFePO-graphene composite was greater than that of pure LiFePO. Of a number of materials studied [namely, pure LiFePO, LiFePO-graphene (1 %), LiFePO-graphene (5 %), and LiFePO-graphene (8 %)], LiFePO-graphene (5 %) delivered the best electrochemical performance with a lithium-ion-diffusion coefficient of 8.18 × 10 cm s and the highest specific discharge capacity of 149 mAh g at 0.17 C; in contrast, the corresponding values for pure LiFePO were 3.01 × 10 cm s and 109 mAh g, respectively. Further, LiFePO-graphene (5 %) showed a very high specific discharge capacity of 170 mAh g at 0.1 C, which is equal to the theoretical capacity of LiFePO.
- Subjects
ELECTRIC batteries research; LITHIUM cells; HYDROTHERMAL electric power systems; ELECTRIC properties of graphene; TRANSMISSION electron microscopes; ELECTROCHEMICAL analysis
- Publication
Journal of Applied Electrochemistry, 2014, Vol 44, Issue 10, p1153
- ISSN
0021-891X
- Publication type
Article
- DOI
10.1007/s10800-014-0717-8