Journal
CHEMICAL SCIENCE
Volume 8, Issue 6, Pages 4285-4291Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7sc00668c
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Funding
- Yale University
- China Scholarship Council
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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.
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