Fabrication of solid-state thin-film batteries using LiMnPO4 thin films deposited by pulsed laser deposition

Daichi Fujimoto, Naoaki Kuwata, Yasutaka Matsuda, Junichi Kawamura, Feiyu Kang

    Research output: Contribution to journalArticlepeer-review

    22 Citations (Scopus)

    Abstract

    Abstract Solid-state thin-film batteries using LiMnPO4 thin films as positive electrodes were fabricated and the electrochemical properties were characterized. The LiMnPO4 thin films were deposited on Pt coated glass substrates by pulsed laser deposition. In-plane X-ray diffraction revealed that the LiMnPO4 thin films were well crystallized and may have a texture with a (020) orientation. The deposition conditions were optimized; the substrate temperature was 600 C and the argon pressure was 100 Pa. The electrochemical measurements indicate that the LiMnPO4 films show charge and discharge peaks at 4.3 V and 4.1 V, respectively. The electrical conductivity of the LiMnPO4 film was measured by impedance spectroscopy to be 2 × 10-11 S cm-1 at room temperature. The solid-state thin-film batteries that show excellent cycle stability were fabricated using the LiMnPO4 thin film. Moreover, the chemical diffusion of the LiMnPO4 thin film was studied by cyclic voltammetry. The chemical diffusion coefficient of the LiMnPO4 thin film is estimated to be 3.0 × 10-17 cm2 s-1, which is approximately four orders magnitude smaller than the LiFePO4 thin films, and the capacity of the thin-film battery was gradually increased for 500 cycles.

    Original languageEnglish
    Article number34121
    Pages (from-to)81-88
    Number of pages8
    JournalThin Solid Films
    Volume579
    DOIs
    Publication statusPublished - 2015 Mar 31

    Keywords

    • All solid-state battery
    • Amorphous solid electrolyte
    • Chemical diffusion coefficient
    • Electronic conductivity
    • Lithium manganese phosphate
    • Olivine-type structure
    • Pulsed laser deposition

    ASJC Scopus subject areas

    • Electronic, Optical and Magnetic Materials
    • Surfaces and Interfaces
    • Surfaces, Coatings and Films
    • Metals and Alloys
    • Materials Chemistry

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