Affiliation:
1. College of Chemistry Huazhong Agricultural University Wuhan 430070 P. R. China
2. School of Chemical Engineering & Advanced Materials The University of Adelaide Adelaide SA 5005 Australia
Abstract
AbstractCoupled electron/ion transport is a decisive feature of Li plating/stripping, wherein the compatibility of electron/ion transport rates determines the morphology of deposited Li. Local Li+ hotspots form due to inhomogeneous interfacial charge transfer and lead to uncontrolled Li deposition, which decreases the Li utilization rate and safety of Li metal anodes. Herein, we report a method to obtain dendrite‐free Li metal anodes by driving electron pumping and accumulating and boosting Li ion diffusion by tuning the work function of a carbon host using cobalt‐containing catalysts. The results reveal that increasing the work function provides an electron deviation from C to Co, and electron‐rich Co shows favorable binding to Li+. The Co catalysts boost Li+ diffusion on the carbon fiber scaffolds without local aggregation by reducing the Li+ migration barrier. The as‐obtained dendrite‐free Li metal anode exhibits a Coulombic efficiency of 99.0 %, a cycle life of over 2000 h, a Li utilization rate of 50 %, and a capacity retention of 83.4 % after 130 cycles in pouch cells at a negative/positive capacity ratio of 2.5. These findings provide a novel strategy to stabilize Li metal by regulating the work function of materials using electrocatalysts.
Funder
National Natural Science Foundation of China
Subject
General Chemistry,Catalysis
Cited by
4 articles.
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