Effect of Neodymium and Yttrium oxides on the Structural and Electrochemical Properties of LiFePO4/C Composite as Cathode of lithium ion Batteries Synthesized by Solid State Method

Subject Areas : journal of New Materials

M.A. Omodifard ¹ (Materials Dept. of Shiraz university)
Babak Hashemi ² (Prof. of Materials Dept.)
Mohsen Babaiee ³ (Researcher/ Iranian space research center)

Received: 2021-04-30 Accepted : 2021-05-10 Published : 2021-02-19

Keywords: "Electrochemical", " LiFePO4", " Lithium Ion Battery", "Neodymium", " Solid State",

Abstract :

Rechargeable batteries such as lithium ion batteries have been used in various industries. In these batteries, the important issue is high energy and power density. One of the important factors affecting this issue is cathode material. LiFePO4/C has been interested as an excellent compounds in recent years. In this study, LiFePO4/C was synthesized by solid state method from raw materials (NH4) H2PO4, FeC2O4.2H2O, Li2CO3 and super pure carbon and in order to improve the weak diffusion of lithium ion and increase the battery capacity at high charge/discharge rates, yttrium and neodymium were added to the LiFePO4/C composite. In this study, TGA-DTA analysis was used to investigate the reaction temperatures of the raw materials and also to determine the synthesis temperature of the compound. SEM images were used to study the microstructure and morphology of the particles and impedance, cycling and cyclic voltammetry tests were used to investigate the electrochemical behavior of the samples. According to the results of this study, it was found that two-step synthesis of the doped samples with yttrium and neodymium ions improves ionic and electrical conductivity of the samples. From the samples synthesized with different percentages of yttrium and neodymium, LiFe99.54Y0.4Nd0.06PO4/C sample with the best electrochemical performance and maximum capacity (113 mAh/g) was selected as the optimal sample.

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