https://scholars.lib.ntu.edu.tw/handle/123456789/409029
標題: | A proof-of-concept graphite anode with a lithium dendrite suppressing polymer coating | 作者: | Luo J. Wu C.-E. Su L.-Y. Huang S.-S. Fang C.-C. Wu Y.-S. Chou J. Wu N.-L. |
關鍵字: | Fast-charge;Graphite anode;Lithium dendrite suppression;Over-lithiation;Polyvinylidene difluoride;Safety | 公開日期: | 2018 | 卷: | 406 | 起(迄)頁: | 63-69 | 來源出版物: | Journal of Power Sources | 摘要: | Dendritic Li deposition on graphite anodes of Li-ion batteries (LIBs) not only deteriorates the anode performance but also causes safety concerns. We demonstrate here a proof-of-concept graphite anode containing a polymer coating that effectively mitigates Li dendrite formation under harsh lithiation conditions. It is shown that Li dendrites with dimensions ranging from a few tens nanometers to microns occur readily on granular graphite electrodes either under 20% over-lithiation at 0.2C or fast lithiation up to 10C rate. In contrast, the graphite anode with a conformal thin coating of high-polarity £]-phase polyvinylidene difluoride (PVDF) on graphite particles exhibits dendrite-free Li plating under either condition. Moreover, the PVDF coated graphite anode exhibits substantially improved cycling stability with high Coulombic efficiencies under the Li-plating conditions. The rise of charge-transfer resistance due to over-lithiation is reduced. The proof of concept for adopting a dendrite-suppressing polymer coating on graphite anodes offers a new strategy for improving battery safety and renders more options for cell design in enhancing energy and power performances for the state-of-the-art LIBs. ? 2018 Elsevier B.V. |
URI: | https://scholars.lib.ntu.edu.tw/handle/123456789/409029 | ISSN: | 03787753 | DOI: | 10.1016/j.jpowsour.2018.10.002 | SDG/關鍵字: | Accident prevention; Anodes; Charge transfer; Charging (batteries); Graphite; Graphite electrodes; Lithium-ion batteries; Polymers; Fast charges; Graphite anode; Lithiation; Lithium dendrite; Polyvinylidene difluoride; Plastic coatings |
顯示於: | 化學工程學系 |
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