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Covalent organic framework with high capacity for the lithium ion battery anode: Insight into intercalation of Li from first-principles calculations.
Journal of Physics. Condensed Matter : An Institute of Physics Journal 2019 Februrary 20
Covalent organic frameworks (COFs) generally have high stability, large charge capacity and wide ion diffusion paths, and they may serve as the potential electrode materials for the lithium ion batteries. Here we explored the structural, electronic, and lithium-storage properties of the newly synthesized NUS-2 COF material by the first-principles calculations. The present results indicate that the micropore environment and the presence of the carbonyl oxygens in the NUS-2 COF can prevent from the formation lithium dimer and the aggregation of lithium bulk, which can improve lithiation efficiency. The predicted maximum theoretical capacity is as high as 742.8 mAh/g and the average cell voltage varies from 3.35 V for Li@NUS-2 to 2.04 V for 14Li@NUS-2, suggesting that the NUS-2 COF material should be a quite suitable lithium-storage anode material.
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