Cold Ageing of NMC811 Lithium-ion Batteries

Chongming Wang, Tazdin Amietszajew, Ruth Carvajal, Yue Guo, Zahoor Ahmed, Cheng Zhang, Gregory Goodlet, Rohit Bhagat

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    Abstract

    In the application of electric vehicles, LiNi0.8Mn0.1Co0.1O2 (NMC811)-a Ni-rich cathode has the potential of replacing LiNiMnCoO2 (NMC111) due to its high energy density. However, NMC811 features relatively poor structural and thermal stabilities, which affect its cycle life. This study aims to address the limited data availability research gap on NMC811 low-temperature degradation. We aged commercial 21700 NMC811 cells at 0 °C under 0.5 C and 1 C current rates. After 200 cycles, post-mortem visual, scanning electron microscopy (SEM) and energy-dispersive X-ray (EDX) spectroscopy, the inspections of harvested electrodes were conducted. In just 200 cold cycles, capacity drops of 25% and 49% were observed in cells aged at 1 C and 0.5 C, respectively. The fast degradation at low temperatures is largely due to lithium plating at the anode side during the charging process. The surprisingly better performance at 1 C is related to enhanced cell self-heating. After subsequent 3-month storage, the cells that experienced 200 cycles at 0 °C and 0.5 C became faulty (voltage: ≈ 0 V), possibly due to cell lithium dendrites and micro short circuits. This work demonstrates that NMC811 suffers from poor cold ageing performance and subsequent premature end-of-life.
    Original languageEnglish
    Article number4724
    Number of pages15
    JournalEnergies
    Volume14
    Issue number16
    DOIs
    Publication statusPublished - 4 Aug 2021

    Bibliographical note

    This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

    Keywords

    • lithium-ion battery
    • NMC811
    • ageing
    • cold cycling
    • Lithium-ion battery
    • Ageing
    • Cold cycling

    ASJC Scopus subject areas

    • Control and Optimization
    • Energy (miscellaneous)
    • Energy Engineering and Power Technology
    • Electrical and Electronic Engineering
    • Fuel Technology
    • Renewable Energy, Sustainability and the Environment

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