Selenium Nanocomposite Cathode with Long Cycle Life for Rechargeable Lithium‐Selenium Batteries
- Department of Mechanical and Energy Engineering Indiana University-Purdue University Indianapolis Indianapolis IN 46202 United States, School of Mechanical Engineering Purdue University West Lafayette IN 47907 United States
- Department of Mechanical and Energy Engineering Indiana University-Purdue University Indianapolis Indianapolis IN 46202 United States, School of Mechanical Engineering Purdue University West Lafayette IN 47907 United States, Center for Nanoscale Materials Argonne National Laboratory Argonne Illinois 60439 United States
- College of Chemistry and Molecular Engineering Zhengzhou University Zhengzhou 450001 P. R. China
- Center for Nanoscale Materials Argonne National Laboratory Argonne Illinois 60439 United States
- Department of Mechanical and Energy Engineering Indiana University-Purdue University Indianapolis Indianapolis IN 46202 United States
Selenium (Se) is a potential cathode material for high energy density rechargeable lithium batteries. In this study, a binder‐free Se‐carbon nanotube (CNT) composite electrode has been prepared by a facile chemical method. At initial state, Se is present in the form of branched nanowires with a diameter of <150 nm and a length of 1–2 μm, interwoven with CNTs. After discharge and re‐charge, the Se nanowires are converted to nanoparticles embedded in the CNT network. This synthesis method provides a path for fabricating the Se cathodes with controllable mass loading and thickness. By studying the composite electrodes with different Se loading and thickness, we found that the electrode thickness has a critical impact on the distribution of Se during repeated cycling. Promising cycling performance was achieved in thin electrodes with high Se loading. The composite electrode with 23 μm thickness and 60 % Se loading shows a high initial capacity of 537 mAh g −1 and stable cycling performance with a capacity of 401 mAh g −1 after 500 cycles at 1 C rate. This study reports a synthesis strategy to obtain Se/CNT composite cathode with long cycle life for rechargeable Li−Se batteries.
- Sponsoring Organization:
- USDOE
- Grant/Contract Number:
- NONE; AC02-06CH11357
- OSTI ID:
- 1508671
- Journal Information:
- Batteries & Supercaps, Journal Name: Batteries & Supercaps Journal Issue: 9 Vol. 2; ISSN 2566-6223
- Publisher:
- Wiley Blackwell (John Wiley & Sons)Copyright Statement
- Country of Publication:
- Germany
- Language:
- English
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