Feng Leng1,2,5, Cher Ming Tan2,3 and Michael Pecht4
1Nanyang Technological University, School of Electrical Electronics Engineering, Singapore, 2TUM CREATE PTE LTD, Singapore
3Chang Gung University, Taiwan, 4Center for Advanced Life Cycle Engineering (CACE), University of Maryland, USA,
5Global Energy Quality And Reliability Technology (G.E.Q.A.R.T). PTE. LTD, Singapore
Abstract:
Temperature is known to have a significant impact on the performance, safety, and cycle lifetime of
lithium-ion batteries (LiB). However, the comprehensive effects of temperature on the cyclic ageing
rate of LiB have yet to be found. We use an electro chemistry-based model (ECBE) here to measure
the effects on the ageing behaviour of cycled LiB operating within the temperature range of 25 °C
to 55 °C. The increasing degradation rate of the maximum charge storage of LiB during cycling at
elevated temperature is found to relate mainly to the degradations at the electrodes, and that the
degradation of LCO cathode is larger than graphite anode at elevated temperature. In particular, the
formation and modification of the surface films on the electrodes as well as structural/phase changes
of the LCO electrode, as reported in the literatures, are found to be the main contributors to the
increasing degradation rate of the maximum charge storage of LiB with temperature for the specific
operating temperature range. Larger increases in the Warburg elements and cell impedance are also
found with cycling at higher temperature, but they do not seriously affect the state of health (SoH)
of LiB as shown in this work.
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