Functional metal–organic framework boosting lithium metal anode performance via chemical interactions. Issue 6 (27th April 2017)

• Record Type: Journal Article
• Authors: Liu, Wen; Mi, Yingying; Weng, Zhe; Zhong, Yiren; Wu, Zishan; Wang, Hailiang
• Is Part Of: Chemical science. Volume 8:Issue 6(2017)
• Page Start: 4285
• Page End: 4291
• Publication Date: 2017-04-27
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/c7sc00668c
• Languages: English
• ISSNs: 2041-6520

Abstract

Abstract : Stable-cycling Li metal anode is realized with a MOF layer regulating Li-ion transport and Li deposition via chemical interactions. Abstract : Dendrite growth and low coulombic efficiency are two major factors that limit the utilization of Li metal electrodes in future generations of high-energy-density rechargeable batteries. This article reports the first study on metal–organic framework (MOF) materials for boosting the electrochemical performance of Li metal electrodes and demonstrates the power of molecular-structure functionalization for realizing desirable ion transport and Li metal nucleation and growth. We show that dendrite-free dense Li deposition and stable Li plating/stripping cycling with high coulombic efficiency are enabled by modifying a commercial polypropylene separator with a titanium-based MOF (NH2 -MIL-125(Ti)) material. The NH2 -MIL-125(Ti)-coated-separator renders Li|Cu cells that can run for over 200 cycles at 1 mA cm −2 –1 mA h cm −2 with average coulombic efficiency of 98.5% and Li|Li symmetric cells that can be cycled at 1 mA cm −2 –1 mA h cm −2 for more than 1200 h without short circuiting. The superior cycling stability is attributed to the amine substituents in the NH2 -MIL-125(Ti) structure which induce increased Li + transference numbers and uniform and dense early-stage Li deposition.