Strong Lithium Polysulfide Chemisorption on Electroactive Sites of Nitrogen-Doped Carbon Composites For High-Performance Lithium-Sulfur Battery Cathodes
Despite the high theoretical capacity of lithium–sulfur batteries, their practical applications are severely hindered by a fast capacity decay, stemming from the dissolution and diffusion of lithium polysulfides in the electrolyte. A novel functional carbon composite (carbon-nanotube-interpenetrated mesoporous nitrogen-doped carbon spheres, MNCS/CNT), which can strongly adsorb lithium polysulfides, is now reported to act as a sulfur host. The nitrogen functional groups of this composite enable the effective trapping of lithium polysulfides on electroactive sites within the cathode, leading to a much improved electrochemical performance (1200 mAhg-1after 200 cycles). The enhancement in adsorption can be attributed to the chemical bonding of lithium ions by nitrogen functional groups in the MNCS/CNT framework. Furthermore, the micrometer-sized spherical structure of the material yields a high areal capacity (ca.6 mAhcm-2) with a high sulfur loading of approximately 5 mgcm-2, which is ideal for practical applications of the lithium–sulfur batteries.
- Pennsylvania State Univ., State College, PA (United States). Dept. of Mechanical and Nuclear Engineering
- Argonne National Lab. (ANL), Argonne, IL (United States). Chemical Sciences and Engineering Div.
- Argonne National Lab. (ANL), Argonne, IL (United States). X-ray Science Div.
- National Energy Technology Lab. (NETL), Pittsburgh, PA, (United States)
- Publication Date:
- OSTI Identifier:
- Report Number(s):
Journal ID: ISSN 1433-7851
- DOE Contract Number:
- EE0005475; AC05-06OR23100
- Resource Type:
- Journal Article
- Resource Relation:
- Journal Name: Angewandte Chemie (International Edition); Journal Volume: 54; Journal Issue: 14
- Research Org:
- National Energy Technology Laboratory - In-house Research; National Energy Technology Laboratory (NETL), Pittsburgh, PA, and Morgantown, WV (United States)
- Sponsoring Org:
- USDOE Office of Fossil Energy (FE)
- Country of Publication:
- United States
- 25 ENERGY STORAGE