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Study on decrystallization of cathode material and decomposition of electrolyte in LiNi1/3Co1/3Mn1/3O2-based cells

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Abstract

Decrystallization of cathode material and decomposition of electrolyte in LiNi1/3Co1/3Mn1/3O2-based cells are studied in this work. Surface morphology of the synthesized material is observed by scanning electron microscope (SEM). Initial charge–discharge capacities and cycling performance are measured in the voltage range of 2.75–4.30 V (vs. Li+/Li). The changes on crystal structure, surface elements of electrodes, and battery impedance are characterized by means of x-ray diffraction (XRD), energy-dispersive spectroscopy (EDS), and electrochemical impedance spectroscopy (EIS), respectively. The results show that the capacity fade is mainly caused by decrystallization of the cathode material and decomposition of electrolyte. During the cycling process, crystal structure is badly destroyed, degree of cation mixing increases, and amorphous phase forms, which will directly lead to the increase of irreversible capacity. Moreover, battery impedance will increase rapidly because the surface of electrode is covered and diffusion path of lithium ions is blocked by impurities generated from the decomposition of the electrolyte.

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Acknowledgments

The authors gratefully acknowledge financial support by The National Basic Research Program of China (973 program no. 2013CB934700).

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Authors and Affiliations

  1. College of Materials Science and Engineering, Sichuan University, Chengdu, 610064, China

    Zongyi Wang, Yun Zhang, Baojun Chen & Chao Lu

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  1. Zongyi Wang
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  2. Yun Zhang
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  3. Baojun Chen
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  4. Chao Lu
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Correspondence to Yun Zhang.

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Wang, Z., Zhang, Y., Chen, B. et al. Study on decrystallization of cathode material and decomposition of electrolyte in LiNi1/3Co1/3Mn1/3O2-based cells. J Solid State Electrochem 18, 1757–1762 (2014). https://doi.org/10.1007/s10008-014-2419-x

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  • DOI: https://doi.org/10.1007/s10008-014-2419-x

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