Synthesis and characterization of Li_1.05Co_1/3Ni_1/3Mn_1/3O_1.95X_0.05 (X = Cl, Br) cathode materials for lithium-ion battery - 01/08/13

Doi : 10.1016/j.crci.2013.01.008

Yuhong Chen ^a,^⁎ , Qishuai Jiao ^a, Liang Wang ^b, Yawei Hu ^a, Na Sun ^a, Yushuang Shen ^a, Yuhua Wang ^c
^a Department of Chemical and Environmental Engineering, Hebei Chemical and Pharmaceutical Vocational Technology College, Fangxing street, Hebei Shijiazhuang 050026, China
^b Library of Hebei University of Science and technology, Hebei Shijiazhuang 050018, China
^c School of materials science and Engineering, Shijiazhuang Tiedao University, Hebei Shijiazhuang 050043, China

^⁎Corresponding author.

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Abstract

In order to improve the thermal stability and dynamic performance of LiCo_1/3Ni_1/3Mn_1/3O₂ materials, Cl-doped and Br-doped materials were synthesized via the co-precipitation method. The morphology, structure, electrochemical performance and thermal stability were characterized by environment scanning electron microscopy (ESEM), X-ray diffraction (XRD), electrochemical impedance spectroscopy (EIS), charge–discharge cycling and differential scanning calorimetry (DSC). Results show that all materials had a stable layered structure with α-NaFeO₂ and that Cl-doping slightly increased the size of grains. Both Cl-doping and Br-doping improved the high rate of discharge capacity, cycle-life performance and thermal stability, but Cl-doping was better than Br-doping in improving the material structure stability, dynamic performance and thermal stability.

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Keywords : Lithium-ion batteries, Cathode materials, Cl-doped, Br-doped

Plan

Introduction

Experimental

Materials synthesis

Preparation of test cells

Morphology and structure tests

Electrochemical tests

Differential scanning calorimeter tests

Results and discussion

Structural properties

Charge–discharge performance

Electrochemical impedance spectroscopy studies

Thermal stability studies

Conclusion

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Vol 16 - N° 9

P. 845-849 - septembre 2013 Retour au numéro

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Synthesis and characterization of Li_1.05Co_1/3Ni_1/3Mn_1/3O_1.95X_0.05 (X = Cl, Br) cathode materials for lithium-ion battery - 01/08/13

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