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Issue 5, 2015
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Hybrid annealing method synthesis of Li[Li0.2Ni0.2Mn0.6]O2 composites with enhanced electrochemical performance for lithium-ion batteries

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Abstract

A lithium rich composite cathode electrode material Li[Li0.2Ni0.2Mn0.6]O2 was synthesized using the hybrid annealing method. Compared with the traditional annealing method, the hybrid annealing method added a cool treatment to the annealing process. Based on detailed characterizations from X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM) and electrochemical impedance spectroscopy (EIS), it is suggested that a good layer structure (axis ratio of c/a > 5.0), appropriate particle size of about 100 nm, and high lithium ion diffusion coefficient around 3.98 × 10−24 cm2 s−1 are attained when the annealing temperature drops to 100 °C. Because of the above reasons the sample showed a high discharge capacity and excellent cycle stability. The first discharge capability and capacity retention after 60 cycles are 287.3 mA h g−1 and 96.1%, respectively. The reasons for the electrochemical enhancement are systematically investigated.

Graphical abstract: Hybrid annealing method synthesis of Li[Li0.2Ni0.2Mn0.6]O2 composites with enhanced electrochemical performance for lithium-ion batteries

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Publication details

The article was received on 06 Nov 2014, accepted on 04 Dec 2014 and first published on 04 Dec 2014


Article type: Paper
DOI: 10.1039/C4RA13961E
Citation: RSC Adv., 2015,5, 3352-3357
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    Hybrid annealing method synthesis of Li[Li0.2Ni0.2Mn0.6]O2 composites with enhanced electrochemical performance for lithium-ion batteries

    J. Liu, L. Kong, M. Xing, M. Shi, Y. Luo and L. Kang, RSC Adv., 2015, 5, 3352
    DOI: 10.1039/C4RA13961E

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