Enhanced electrochemical performance of LiFePO4/C wrapped with sulfur-modified reduced graphene oxide for Li-ion batteries

• Published in: Ionics Vol. 28; no. 1; pp. 191 - 200
• Main Authors: Chen, Zi-Liang, Gu, Yi-Jing, Luo, Gui-Yang, Huo, Yong-Lin, Wu, Fu-Zhong
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 2022; Springer Nature B.V
• Subjects: Chemistry; Chemistry and Materials Science; Composite materials; Condensed Matter Physics; Diffusion coefficient; Discharge; Electrochemical analysis; Electrochemistry; Energy Storage; Graphene; Ion diffusion; Lithium-ion batteries; Olivine; Optical and Electronic Materials; Original Paper; Rechargeable batteries; Renewable and Green Energy; Sodium sulfide; Sulfur; Lithium-ion battery; Electrochemical performance; LiFePO; C; S-modified reduced graphene oxide
• DOI: 10.1007/s11581-021-04339-9
• ISSN: 0947-7047

Although researchers have previously examined whether graphene modified by sulfur can improve the electrochemical performance of LiFePO 4 /C composites, they have rarely examined whether it can do so during the synchronous synthesis of LiFePO 4 /C and sulfur-modified reduced graphene oxide (SG) via a one-step hydrothermal method. To answer this question, a series of olivine structure LiFePO 4 /C composites wrapped with SG were investigated. Subsequently, we found that SG can form a three-dimensional conductive network on the surface of the LiFePO 4 /C sample. In the process, XRD and HRTEM tests were undertaken as well. From the XRD test, the results show that SG does not affect the olivine structure of LiFePO 4 /C. In the HRTEM experiment, clear lattice fringes and a uniformly coated carbon layer on the sample surface were observed. Alongside these results, there were 4 others. First, the charge–discharge data showed that the electrochemical performance of the samples could be increased by SG modification. Second, sample S2 with a mass ratio of Na 2 S to rGO of 1:10 shows the best specific discharge capacity and stability. Third, the specific capacity of S2 is 163 mAhg −1 at 0.2 C, and the capacity retention is 108.23% even after 200 cycles at a magnification of 10 C. Fourth, according to EIS, the charge migrating resistance of S2 is 226.4 Ω, and the lithium-ion diffusion coefficient is 2.41 × 10 −14 cm 2 ·S −1 . The significance of these results is that they indicate that wrapping LiFePO 4 /C with SG significantly contributed to the improvement of its electrochemical performance.