Synthesis and Electrochemical Characterizations of Zinc-doped LiFePO4/C by Carbothermal Reduction

doi:10.3724/SP.J.1077.2010.10105

Abstract

Abstract:

Alien atom doping has been adopted to modify the electrochemical performance of olivine type LiFePO₄for cathode material. Here, we report that zinc-doping can improve the performance of LiFePO₄/C immensely by a simple method. LiFePO₄/C and Zn-doped LiFePO₄/C cathode materials were firstly synthesized by carbothermal reduction method. Physical-chemical characterizations were done by X-ray diffraction, scanning electron microscope and transmittance electron microscope. Electrochemical behavior of the cathode materials were analyzed by using cyclic voltammetry, and galvanostatic measurements were employed to characterize the reaction of lithium ion insertion and de-insertion. ICP and XRD analyses indicate that Zn ions were sufficiently doped in LiFePO₄ and did not alter its crystal structure. During de-intercalation and intercalation process of lithium ions, the doped zinc atoms protect the LiFePO₄ crystal from shrink. Consequently, the conductivity is enhanced after doping. It is noted that zinc ions doping can improve performance of LiFePO₄, especially on the aspect of stable cycle-life at higher C rate.

Key words: LiFePO₄, doping zinc, lithium ion battery, cycle performance

CLC Number:

TM912

HUA Ning, WANG Chen-Yun, KANG Xue-Ya, Tuerdi, HAN Ying. Synthesis and Electrochemical Characterizations of Zinc-doped LiFePO₄/C by Carbothermal Reduction[J]. Journal of Inorganic Materials, 2010, 25(8): 887-892.

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Synthesis and Electrochemical Characterizations of Zinc-doped LiFePO₄/C by Carbothermal Reduction

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