Abstract
A thin-film lithium phosphorous oxynitride (LiPON) layer on the top of a graphite anode is synthesized via radio frequency magnetron sputtering, whereas the thickness of the film is about 0.3 ~ 1.3 μm. The field emission scanning electron microscopy on the samples confirms the even-coated layer on the anode, while the thickness of layer is reconfirmed by weighing the area density of sputtered anode. The storage experiment at elevated temperature of LiNi0.8Co0.15Al0.05O2/graphite cells with and without a LiPON layer on anode reveals that the LiPON layer on the anode would restrain the capacity loss when compared with bare anode. Moreover, it is found that a thicker LiPON layer on anode would provide better capacity retention during storage aging. Meanwhile, the electrochemical impedance spectroscopy is recorded during aging and its equivalent circuit simulation is proposed. Also, the anode surface morphology with and without a LiPON layer is observed before and after aging. Based on these investigations and analysis, we conclude that the LiPON layer on the top of the anode would act as a protective layer and improve the capacity retention during storage aging at elevated temperature.
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Acknowledgements
This work was supported by the Research Project of National University of Defense Technology (ZDYYJCYJ 20140701). Meanwhile, we would gratefully like to thank the Zhong Fang Gai De Vacuum Technology Co. Ltd., Beijing, China, for providing us the rf magnetron sputtering equipment.
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Liu, Y., Xie, K., Pan, Y. et al. LiPON as a protective layer on graphite anode to extend the storage life of Li-ion battery at elevated temperature. Ionics 24, 723–734 (2018). https://doi.org/10.1007/s11581-017-2250-3
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DOI: https://doi.org/10.1007/s11581-017-2250-3