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Functional metal–organic framework boosting lithium metal anode performance via chemical interactions

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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.

Graphical abstract: Functional metal–organic framework boosting lithium metal anode performance via chemical interactions

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Publication details

The article was received on 13 Feb 2017, accepted on 09 Apr 2017 and first published on 18 Apr 2017


Article type: Edge Article
DOI: 10.1039/C7SC00668C
Citation: Chem. Sci., 2017, Advance Article
  • Open access: Creative Commons BY-NC license
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    Functional metal–organic framework boosting lithium metal anode performance via chemical interactions

    W. Liu, Y. Mi, Z. Weng, Y. Zhong, Z. Wu and H. Wang, Chem. Sci., 2017, Advance Article , DOI: 10.1039/C7SC00668C

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