Luo J.Wu C.-E.Su L.-Y.Huang S.-S.Fang C.-C.Wu Y.-S.Chou J.Wu N.-L.2019-05-172019-05-17201803787753https://scholars.lib.ntu.edu.tw/handle/123456789/409029Dendritic 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.Fast-chargeGraphite anodeLithium dendrite suppressionOver-lithiationPolyvinylidene difluorideSafety[SDGs]SDG7Accident prevention; Anodes; Charge transfer; Charging (batteries); Graphite; Graphite electrodes; Lithium-ion batteries; Polymers; Fast charges; Graphite anode; Lithiation; Lithium dendrite; Polyvinylidene difluoride; Plastic coatingsjournal article10.1016/j.jpowsour.2018.10.0022-s2.0-85054914292https://www.scopus.com/inward/record.uri?eid=2-s2.0-85054914292&doi=10.1016%2fj.jpowsour.2018.10.002&partnerID=40&md5=7f69847abfe70584fa208eea2b16a950