Formation Mechanism of LiFePO4 Sticks Grown by a Microwave-Assisted Liquid-Phase Process

Authors

  • Daniel Carriazo,

    Corresponding author
    1. Laboratory for Multifunctional Materials, Department of Materials, ETH-Zürich, Wolfgang-Pauli-Str. 10, 8093-Zürich, Switzerland
    2. Instituto de Ciencia de Materiales de Madrid-ICMM, Consejo Superior de Investigaciones Científicas-CSIC, Campus de Cantoblanco, 28049-Madrid, Spain
    • Laboratory for Multifunctional Materials, Department of Materials, ETH-Zürich, Wolfgang-Pauli-Str. 10, 8093-Zürich, Switzerland.
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  • Marta D. Rossell,

    1. Laboratory for Multifunctional Materials, Department of Materials, ETH-Zürich, Wolfgang-Pauli-Str. 10, 8093-Zürich, Switzerland
    2. EMPA, Swiss Federal Laboratories for Materials Science and Technology, CH-8600 Dübendorf, Switzerland
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  • Guobo Zeng,

    1. Laboratory for Multifunctional Materials, Department of Materials, ETH-Zürich, Wolfgang-Pauli-Str. 10, 8093-Zürich, Switzerland
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  • Idalia Bilecka,

    1. Laboratory for Multifunctional Materials, Department of Materials, ETH-Zürich, Wolfgang-Pauli-Str. 10, 8093-Zürich, Switzerland
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  • Rolf Erni,

    1. EMPA, Swiss Federal Laboratories for Materials Science and Technology, CH-8600 Dübendorf, Switzerland
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  • Markus Niederberger

    1. Laboratory for Multifunctional Materials, Department of Materials, ETH-Zürich, Wolfgang-Pauli-Str. 10, 8093-Zürich, Switzerland
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Abstract

A time-dependent study on the formation of LiFePO4 with olivine-type structure is presented. The material is synthesized through a non-aqueous route in benzyl alcohol assisted by microwave radiation. The LiFePO4 forms with an anisotropic morphology of microscale stick-like particles. The detailed structure of these particles and their evolution with reaction time is revealed by transmission electron microscopy; a 3D reconstruction of a particle by electron tomography provides insight into the formation mechanism of these sticks. Without applying a thermal post-annealing treatment or a carbon coating, the electrochemical behavior of the LiFePO4 microsticks is assessed for the preparation of cathodes in lithium-ion batteries.

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