首次利用1,3-二氧五环(DOL)对金属锂电极进行预处理,以使该电极钝化,提高其界面稳定性.电化学阻抗谱(EIS)分析表明,当金属锂电极长时间浸泡在电解液中时,经过DOL预处理的锂电极与未经处理的锂电极相比,具有更低、更稳定界面阻抗.同时,扫描电子显微镜(SEM)观察也证明,在长时间浸泡后,经过预处理的锂电极表面要比未经处理的锂电极表面,更加平整,并有更少的锂枝晶出现.显然,DOL预处理对锂电极具有很好的钝化作用.进而,由于预处理在锂电极表面生成稳定的界面膜所具有的钝化作用,经过该处理的锂电极在连续的充放电循环中,显示出更高的循环效率.
In this work, 1,3-dioxolane (DOL) is originally used to pretreat the lithium metal electrode in order to passivate lithium metal and improve its interface stability. Electrochemical impedance spectra (EIS) measurements revealed that with the DOL pretreatment lithium electrode had lower and more stable interface resistance during the storage in electrolyte for a long time. And it was proved by SEM that the pretreated one has smoother morphology and less dendrite after longtime storage. Obviously, the DOL pretreatment has good passivating effects on lithium electrode. Furthermore, benefiting from the passivating effects of the stable interface film formed through DOL pretreatment, the pretreated lithium anode has higher efficiency in the repeated charge/discharge cycles.
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