NiS2/FeS Holey Film as Freestanding Electrode for High‐Performance Lithium Battery |
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| Authors: | Kun Liang Kyle Marcus Shoufeng Zhang Le Zhou Yilun Li Samuel T De Oliveira Nina Orlovskaya Yong‐Ho Sohn Yang Yang |
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| Institution: | 1. NanoScience Technology Center, University of Central Florida, Orlando, FL, USA;2. Department of Materials Science and Engineering, University of Central Florida, Orlando, FL, USA;3. Laboratory of Theoretical and Computational Chemistry, Institute of Theoretical Chemistry, Jilin University, Changchun, P. R. China;4. Department of Chemistry, Rice University, Houston, TX, USA;5. Department of Mechanical and Aerospace Engineering, University of Central Florida, Orlando, FL, USA |
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| Abstract: | In this work, a freestanding NiS2/FeS holey film (HF) is prepared after electrochemical anodic and chemical vapor deposition treatments. With the combination of good electrical conductivity and holey structure, the NiS2/FeS HF presents superior electrochemical performance, due to the following reasons: (i) Porous structure of HF provides a large surface area and more active sites/channels/pathways to enhance the ion/mass diffusion. Moreover, the porous structure can reduce the damage from the volumetric expansion. (ii) The as‐prepared electrode combines the current collector (residual NiFe alloy) and active materials (sulfides) together, thus reducing the resistance of the electrode. Additionally, the good conductivity of HF can improve electron transport. (iii) Sulfides are more stable as active materials than sulfur, showing only a small capacity decay while retaining high cyclability performance. This work provides a promising way to develop high energy and stable electrode for Li‐S battery. |
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| Keywords: | high cyclability holey films lithium batteries metal sulfides porous structures |
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