Abstract
18650-type lithium iron phosphate/graphite cells are cycled at 25 and 55 °C in order to investigate cycle performance and diagnostics for capacity fading. The cell losses more than 30 % of its initial capacity after 600 cycles when cycled at 55 °C compared to a 5 % loss for the cell cycled at 25 °C. There is no evident difference appeared between cathode and anode capacities before and after cycling, but only part of the cathode capacity could be recovered on the first charge after cycling. The loss of cycleable lithium is supposed to be the reason for the capacity fade. And both catalytic reaction of iron deposited on graphite surface and damage of solid–electrolyte interface layer by volume change play important roles in capacity fade.
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This work was supported by the foundation of the National Key Technology Research and Development Program of China (no. 2007BAE12B01) and the National Natural Science Foundation of China (no. 20803095).
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Song, H., Cao, Z., Chen, X. et al. Capacity fade of LiFePO4/graphite cell at elevated temperature. J Solid State Electrochem 17, 599–605 (2013). https://doi.org/10.1007/s10008-012-1893-2
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DOI: https://doi.org/10.1007/s10008-012-1893-2