Performance of 26650 Li-ion cells at elevated temperature under simulated PHEV drive cycles

P. Badami, A. Opitz, L. Shen, R. Vaidya, Abdel Mayyas, K. Knoop, A. Razdan, Arunachala Mada Kannan

    Research output: Contribution to journalArticle

    1 Citation (Scopus)

    Abstract

    Cylindrical (type: 26650) Li-ion cells (LiFePO4 cathodes) currently used in the electric vehicles (EVs), plug-in hybrid electric vehicles etc. were subjected to simulated federal urban driving schedule at 25 and 50 °C for performance evaluation. Drive profiles (current versus time) for charge sustaining and charge depleting modes were derived from the federal urban driving schedule velocity profiles considering acceleration, regenerative braking, rolling resistance, drag force etc. for typical plug-in hybrid electric vehicles. In particular, the batteries were cycled extensively at 50 °C under charge sustaining as well as charge depleting modes to monitor capacity values, followed by analyzing the LiFePO4 cathode material by X-ray diffraction analysis. The capacity degradation was found to be very significant in both the modes with 13 and 19% under charge sustaining and charge depleting modes after 337 and 1007 cycles, respectively at elevated temperature. High frequency resistance values measured by electrochemical impedance spectroscopy were found to increase significantly under high temperature cycling, leading to power fading. As evident from Rietveld analysis, phase change in LiFePO4 is observed beyond 1000 cycles at elevated temperature under charge depleting mode, with the observation of FePO4 from the powder diffraction data of the cathodes from the cycled cells. In addition, there was also significant change in crystallite size of the cathode active materials after charge/discharge cycling under charge depleting mode.

    Original languageEnglish (US)
    JournalInternational Journal of Hydrogen Energy
    DOIs
    StateAccepted/In press - Jan 27 2017

    Fingerprint

    Cathodes
    Plug-in hybrid vehicles
    cycles
    sustaining
    Ions
    cells
    electric hybrid vehicles
    ions
    cathodes
    plugs
    schedules
    Rolling resistance
    Regenerative braking
    Rietveld analysis
    Temperature
    temperature
    Crystallite size
    Electric vehicles
    Electrochemical impedance spectroscopy
    X ray diffraction analysis

    Keywords

    • Capacity fading
    • Charge depleting mode
    • Charge sustaining mode
    • LiFePO cathodes
    • Plug-in electric vehicles

    ASJC Scopus subject areas

    • Renewable Energy, Sustainability and the Environment
    • Fuel Technology
    • Condensed Matter Physics
    • Energy Engineering and Power Technology

    Cite this

    Performance of 26650 Li-ion cells at elevated temperature under simulated PHEV drive cycles. / Badami, P.; Opitz, A.; Shen, L.; Vaidya, R.; Mayyas, Abdel; Knoop, K.; Razdan, A.; Mada Kannan, Arunachala.

    In: International Journal of Hydrogen Energy, 27.01.2017.

    Research output: Contribution to journalArticle

    @article{0bf5355a3a404904b98faf5f9b8ac0c5,
    title = "Performance of 26650 Li-ion cells at elevated temperature under simulated PHEV drive cycles",
    abstract = "Cylindrical (type: 26650) Li-ion cells (LiFePO4 cathodes) currently used in the electric vehicles (EVs), plug-in hybrid electric vehicles etc. were subjected to simulated federal urban driving schedule at 25 and 50 °C for performance evaluation. Drive profiles (current versus time) for charge sustaining and charge depleting modes were derived from the federal urban driving schedule velocity profiles considering acceleration, regenerative braking, rolling resistance, drag force etc. for typical plug-in hybrid electric vehicles. In particular, the batteries were cycled extensively at 50 °C under charge sustaining as well as charge depleting modes to monitor capacity values, followed by analyzing the LiFePO4 cathode material by X-ray diffraction analysis. The capacity degradation was found to be very significant in both the modes with 13 and 19{\%} under charge sustaining and charge depleting modes after 337 and 1007 cycles, respectively at elevated temperature. High frequency resistance values measured by electrochemical impedance spectroscopy were found to increase significantly under high temperature cycling, leading to power fading. As evident from Rietveld analysis, phase change in LiFePO4 is observed beyond 1000 cycles at elevated temperature under charge depleting mode, with the observation of FePO4 from the powder diffraction data of the cathodes from the cycled cells. In addition, there was also significant change in crystallite size of the cathode active materials after charge/discharge cycling under charge depleting mode.",
    keywords = "Capacity fading, Charge depleting mode, Charge sustaining mode, LiFePO cathodes, Plug-in electric vehicles",
    author = "P. Badami and A. Opitz and L. Shen and R. Vaidya and Abdel Mayyas and K. Knoop and A. Razdan and {Mada Kannan}, Arunachala",
    year = "2017",
    month = "1",
    day = "27",
    doi = "10.1016/j.ijhydene.2017.02.004",
    language = "English (US)",
    journal = "International Journal of Hydrogen Energy",
    issn = "0360-3199",
    publisher = "Elsevier Limited",

    }

    TY - JOUR

    T1 - Performance of 26650 Li-ion cells at elevated temperature under simulated PHEV drive cycles

    AU - Badami, P.

    AU - Opitz, A.

    AU - Shen, L.

    AU - Vaidya, R.

    AU - Mayyas, Abdel

    AU - Knoop, K.

    AU - Razdan, A.

    AU - Mada Kannan, Arunachala

    PY - 2017/1/27

    Y1 - 2017/1/27

    N2 - Cylindrical (type: 26650) Li-ion cells (LiFePO4 cathodes) currently used in the electric vehicles (EVs), plug-in hybrid electric vehicles etc. were subjected to simulated federal urban driving schedule at 25 and 50 °C for performance evaluation. Drive profiles (current versus time) for charge sustaining and charge depleting modes were derived from the federal urban driving schedule velocity profiles considering acceleration, regenerative braking, rolling resistance, drag force etc. for typical plug-in hybrid electric vehicles. In particular, the batteries were cycled extensively at 50 °C under charge sustaining as well as charge depleting modes to monitor capacity values, followed by analyzing the LiFePO4 cathode material by X-ray diffraction analysis. The capacity degradation was found to be very significant in both the modes with 13 and 19% under charge sustaining and charge depleting modes after 337 and 1007 cycles, respectively at elevated temperature. High frequency resistance values measured by electrochemical impedance spectroscopy were found to increase significantly under high temperature cycling, leading to power fading. As evident from Rietveld analysis, phase change in LiFePO4 is observed beyond 1000 cycles at elevated temperature under charge depleting mode, with the observation of FePO4 from the powder diffraction data of the cathodes from the cycled cells. In addition, there was also significant change in crystallite size of the cathode active materials after charge/discharge cycling under charge depleting mode.

    AB - Cylindrical (type: 26650) Li-ion cells (LiFePO4 cathodes) currently used in the electric vehicles (EVs), plug-in hybrid electric vehicles etc. were subjected to simulated federal urban driving schedule at 25 and 50 °C for performance evaluation. Drive profiles (current versus time) for charge sustaining and charge depleting modes were derived from the federal urban driving schedule velocity profiles considering acceleration, regenerative braking, rolling resistance, drag force etc. for typical plug-in hybrid electric vehicles. In particular, the batteries were cycled extensively at 50 °C under charge sustaining as well as charge depleting modes to monitor capacity values, followed by analyzing the LiFePO4 cathode material by X-ray diffraction analysis. The capacity degradation was found to be very significant in both the modes with 13 and 19% under charge sustaining and charge depleting modes after 337 and 1007 cycles, respectively at elevated temperature. High frequency resistance values measured by electrochemical impedance spectroscopy were found to increase significantly under high temperature cycling, leading to power fading. As evident from Rietveld analysis, phase change in LiFePO4 is observed beyond 1000 cycles at elevated temperature under charge depleting mode, with the observation of FePO4 from the powder diffraction data of the cathodes from the cycled cells. In addition, there was also significant change in crystallite size of the cathode active materials after charge/discharge cycling under charge depleting mode.

    KW - Capacity fading

    KW - Charge depleting mode

    KW - Charge sustaining mode

    KW - LiFePO cathodes

    KW - Plug-in electric vehicles

    UR - http://www.scopus.com/inward/record.url?scp=85013379936&partnerID=8YFLogxK

    UR - http://www.scopus.com/inward/citedby.url?scp=85013379936&partnerID=8YFLogxK

    U2 - 10.1016/j.ijhydene.2017.02.004

    DO - 10.1016/j.ijhydene.2017.02.004

    M3 - Article

    JO - International Journal of Hydrogen Energy

    JF - International Journal of Hydrogen Energy

    SN - 0360-3199

    ER -