我院魏涛副教授在《International Journal of Minerals, Metallurgy and Materials》上发表关于固态锂离子电池的研究成果
来源:mg游戏官网在线平台--发布时间: 2021-05-26 浏览次数: 11

近期,由我院副教授魏涛为第一作者,研究生张早红等通过路易斯酸碱理论设计了一种高离子迁移数(高达0.72,传统液态电解质只有0.4左右)的固态电解质,即利用MOFs材料所带的氨基基团吸附固定固态电解质中的阴离子,该电解质表现出较好的容量和循环性能,相关成果以题为“Anion-immobilized solid composite electrolytes based on metal-organic frameworks and superacid ZrO2 fillers for high-performance all solid-state lithium metal batteries”在《International Journal of Minerals, Metallurgy and Materials》上发表,该刊为江科大A类期刊。



Anion-immobilized solid composite electrolytes (SCEs) are important to restrain the propagation of lithium dendrites for all solid-state lithium metal batteries (ASSLMBs). Herein, a novel SCEs based on metal-organic frameworks (MOFs, UiO-66-NH2) and superacid ZrO2 (S-ZrO2) fillers are proposed, and the samples were characterized by XRD, SEM, EDS, TGA and some other electrochemical measurements. The -NH2 groups of UiO-66-NH2 combines with F atoms of PVDF-HFP chains by hydrogen bonds, leading to a high electrochemical stability window of 5 V. Owing to the incorporation of UiO-66-NH2 and S-ZrO2 in PVDF-HFP polymer, the open metal sites of MOFs and acid surfaces of S-ZrO2 can immobilize anions by strong Lewis acid-base interaction, which enhances the effect of immobilization anions, achieving a high Li-ion transference number (t+) of 0.72, and acquiring a high ionic conductivity of 1.05×10-4 S cm-1 at 60. The symmetrical Li/Li cells with the anion-immobilized SCEs may steadily operate for over 600 h at 0.05 mA cm-2 without the short-circuit occurring. Besides, the solid composite Li/LiFePO4 (LFP) cell with the anion-immobilized SCEs shows a superior discharge specific capacity of 158 mAh g-1 at 0.2 C. The results illustrate that the anion-immobilized SCEs are one of the most promising choices to optimize the performances of ASSLMBs..