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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。
For the first time, 1,3-dioxolane (DOL) was used to pretreat the metal lithium electrode to deactivate the electrode and improve its interfacial stability. Electrochemical impedance spectroscopy (EIS) analysis showed that when the metal lithium electrode immersed in the electrolyte for a long time, the DOL pretreated lithium electrode had a lower and more stable interface impedance than the untreated lithium electrode. Scanning electron microscopy (SEM) observations also demonstrated that after a long immersion, the surface of the pretreated lithium electrode was smoother and had fewer lithium dendrites than the untreated lithium electrode surface. Obviously, DOL pretreatment has a good passivation effect on the lithium electrode. Furthermore, the lithium electrode subjected to this treatment shows higher cycle efficiency in a continuous charge-discharge cycle due to the passivation provided by the pretreatment to generate a stable interface film on the surface of the lithium electrode.