Abstract：The low ion conductivity of solid-state electrolyte and instable electrode-electrolyte interface are key factors to hindering the development of solid-state lithium battery. In this work, we synthesized a novel solid-state electrolyte combined poly (vinylene carbonate) and succinonitrile (SN) via in-situ thermal polymerization, and studied the effect of SN on solid-state electrolyte electrochemical properties and electrode-electrolyte interface. The results show that the high antioxidative SN are uniformly distributed in the solid-state electrolyte, which promotes the dissociation of lithium salts as well as the movement ability of polymer segments and hence enhances the network of ionic conductivity. After the introduction of SN, the ionic conductivity at room temperature increases from 2.4×10-6 S/cm to 1.213×10-3 S/cm, and the decomposition potential increases from 4.58 V to 5.52 V. The solid-state electrolyte with w(SN)=10% delivers excellent cyclability with a high discharge capacity of 163.1 mAh/g. During the charging process, the nitrile group with lone pair electrons on the SN can coordinate with the highly reactive transition metal ions, which suppresses the parasitic reactions on the electrode-electrolyte interface and thus enhances the structural stability of cathode materials.
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2021, Vol. 26 
