Anchoring anions with metal–organic framework-functionalized separators for advanced lithium batteries. Issue 3 (30th January 2019)

• Record Type: Journal Article
• Authors: Shen, Li; Wu, Hao Bin; Liu, Fang; Zhang, Chen; Ma, Shengxiang; Le, Zaiyuan; Lu, Yunfeng
• Is Part Of: Nanoscale horizons. Volume 4:Issue 3(2019)
• Page Start: 705
• Page End: 711
• Publication Date: 2019-01-30
• Subjects: Nanoscience -- Periodicals; Nanotechnology -- Periodicals; 620.505
• DOI: 10.1039/c8nh00342d
• Languages: English
• ISSNs: 2055-6756

Abstract

Abstract : A metal–organic framework-functionalized separator has been developed to anchor anions and promote Li + transport in liquid electrolytes, enabling superior electrochemical performance in advanced lithium batteries. Abstract : The low Li + transference number ( t Li + ), or the relatively small proportion of Li + conductivity with respect to total ionic conductivity, has been identified as a key drawback of binary electrolytes. The lack of approaches to restrain anion mobility results in the poor cyclability of energy-dense electrodes as the high rate of anion movement induces concentration polarization. Herein, we propose regulating the ion conduction behavior using a nanocomposite separator fabricated via the functionalization of a glass fiber (GF) separator with a metal–organic framework (MOF). The open metal sites in the MOF serve as the anchoring sites for anions, and the resulting t Li + is increased by 100%. The MOF-functionalized nanocomposite separator with high t Li + substantially improves the electrochemical performance of a Li metal anode, with an areal capacity exceeding 2 mA h cm −2, and intercalation-type electrodes (LiFePO4 and Li4 Ti5 O12 ), with high active material loadings of 45 mg cm −2 .