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H.J. Lin, H.D. Shi, Z. Wang, Y.W. Mu, S.D. Li, J.J. Zhao, J.W. Guo, B. Yang, Z.-S. Wu,* and F. Liu* 
ACS Nano, 2021, 15, 11, 17327–17336.
DOI: 10.1021/acsnano.1c04961 [PDF]

发布时间:2021-09-22    栏目名称:2021

H.J. Lin, H.D. Shi, Z. Wang, Y.W. Mu, S.D. Li, J.J. Zhao, J.W. Guo, B. Yang, Z.-S. Wu,* and F. Liu*

ACS Nano, 2021, 15, 11, 17327–17336.

DOI: 10.1021/acsnano.1c04961 [PDF]

Two-dimensional (2D) borophene is predicted as an idealelectrode materialfor lithium sulfur (Li-S) batteries because of its low-density, metallic conductivity, high Li-ion surface mobility and strong interface bonding energy to polysulfide. But until now, 2D borophene-based Li-S batteries have not yet been achieved due to the absence of large-scale synthetic method of freestanding borophene nanostructures withnicestructural stability and uniformity for practical use. Herein, we developed a novel low-temperature liquid exfoliation (LTLE) method to synthesize freestanding few-layerβ12-borophene single crystalline sheets with asymmetryin tens of milligram scale. The as-synthesized 2D sheets were used as the polysulfide immobilizers and electrocatalysts of Li-S batteries for the first time. The resulting Li-S cells using borophene sheets delivered a strikingly large areal capacity of 5.2 mAh cm-2at a high sulfur loading of 7.8 mg cm-2, an very excellent rate performance of 8 C(@721 mAh g-1)as well as an ultralow capacity fading rate of 0.039% in1000 cycles, which was much better than commercial Li-ion batteries and many other 2D material-based Li-S batteries. Based on density functional theory (DFT) model, their high-activity behaviors are believed to originate from the significant enhancement of both the Li-ion’s surface migration and the adsorption energy for Li2Snclusters under the help of few-layerβ12-borophene. Our research reveals great potential of freestandingβ12-borophene single crystalline sheets in future high-performance Li-S batteries.

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