Precast solid electrolyte interface film on Li metal anode toward longer cycling life
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In this paper, a precast solid electrolyte interface (SEI) film strategy was explored for Li metal anode with longer cycling life. At the current density of 0.5 mA cm−2 for 0.5 mAh cm−2 of Li, electrochemical performance tests showed that the half cell with optimized precast SEI film had a coulombic efficiency of more than 99.0% after 620 cycles. Cyclic voltammetry, electrochemical impedance spectrum, mechanical properties, ionic conductivity, scanning electron microscopy, infrared spectroscopy, thermogravimetry, etc., were used to analyze the performance of SEI film. The results showed that when 0.04 mol of lithium bis(oxalato)borate was added into 7.0 g of the poly(vinylidene fluoride-co-hexafluoropropylene) matrix as the components of SEI film, the half cell with the precast SEI film showed the best cycling performance. When different kinds of lithium salts were added into the matrix, the morphology and property after curing were different, which affected the tensile strength, elongation, ionic conductivity, electrolyte absorption rate, and thermal decomposition temperature. Moreover, it had also been found that the strength and ionic conductivity were the main factors in determining the performance of the precast SEI film.
KeywordsLi metal anode SEI film Cycling life PVDF-HFP LiBOB
We thank the National Natural Science Foundation of China (Nos. 51604089 and 51874110), Natural Science Foundation of Heilongjiang Province (No. JJ20180042), China Postdoctoral Science Foundation (Nos. 2016M601431 and 2018T110308), and Heilongjiang Provincial Postdoctoral Science Foundation (Nos. LBH-Z16056 and LBH-TZ1707) for the financial support.
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