Rare Earth Element Aliovalent Doping Substitution and Electrochemical Performance of LiFe1-x NdxPO4

Min Shou Zhao; Li Zhang

doi:10.4028/www.scientific.net/MSF.654-656.2883

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HomeMaterials Science ForumMaterials Science Forum Vols. 654-656Rare Earth Element Aliovalent Doping Substitution...

Rare Earth Element Aliovalent Doping Substitution and Electrochemical Performance of LiFe_1-x Nd_xPO₄

Abstract:

LiFe1-xNdxPO4 /C cathode material has been synthesized by solid-state reaction. The structure and electrochemical performances of LiFe1-xNdxPO4 /C(x = 0 - 0.08) have been studied by XRD, FE-SEM, EIS and galvanostatic charge-discharge. The magnetization curve of LiFe1-xNdxPO4/C sample is measured by SQUID (Superconducting Quantum Interference Device) to examine if Fe3+ ion exists in LiFe1-xNdxPO4/C. The results show that a small amount of aliovalent Nd3+-dopant substitution on Fe+2 can effectively reduce the particle size of LiFePO4/C. The cell parameters of LiFe1-xNdxPO4 (x = 0.04 - 0.08) are calculated on Si internal standard, and LiFe1-xNdxPO4/C has the same olivine structure as LiFePO4, and delivers the highest discharge capacity of 165.2 mAh•g−1 at 0.2 C rate and the capacity retention rate is 92.8 % after 100 cycles. The charge transfer resistance decreases with adding glucose and Nd3+ ion. The measured theoretical capacity of 168.65 mAh∙g-1 is obtained. All the results imply that aliovalent doping substitution on Fe site in LiFePO4 is tolerant.

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Materials Science Forum (Volumes 654-656)

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2883-2886

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https://doi.org/10.4028/www.scientific.net/MSF.654-656.2883

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June 2010

Authors:

Min Shou Zhao, Li Zhang

Keywords:

Cathode Material, Electrochemical Performance, Lithium Iron Phosphate, Lithium-Ion Battery, Rare Earth Element Doped

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