Resilient carbon encapsulation of iron pyrite (FeS2) cathodes in lithium ion batteries
| Autor: | Matthew Tussing, Yongan Yang, Tara S. Yoder, Jacqueline E. Cloud |
|---|---|
| Rok vydání: | 2015 |
| Předmět: |
chemistry.chemical_classification
Materials science Aqueous solution Renewable Energy Sustainability and the Environment Composite number Inorganic chemistry Energy Engineering and Power Technology Polymer Electrochemistry Cathode law.invention Chemical engineering Nanocrystal chemistry law Electrode Tube furnace Electrical and Electronic Engineering Physical and Theoretical Chemistry |
| Zdroj: | Journal of Power Sources. 274:685-692 |
| ISSN: | 0378-7753 |
| DOI: | 10.1016/j.jpowsour.2014.10.124 |
| Popis: | Converting iron pyrite (FeS2) from a non-cyclable to a cyclable cathode material for lithium ion batteries has been an ongoing challenge in recent years. Herein we report a promising mitigation strategy: wet-chemistry based conformal encapsulation of synthetic FeS2 nanocrystals in a resilient carbon (RC) matrix (FeS2@RC). The FeS2@RC composite was fabricated by dispersing autoclave-synthesized FeS2 nanocrystals in an aqueous glucose solution, polymerizing the glucose in a hydrothermal reactor, and finally heating the polymer/FeS2 composite in a tube furnace to partially carbonize the polymer. The FeS2@RC electrodes showed superior cyclability compared with the FeS2 electrodes, that is, 25% versus 1% of retention at the 20th cycle. Based on electrochemical analysis, XRD study, and SEM characterization, the performance enhancement was attributed to RC's ability to accommodate volume fluctuation, enhance charge transfer, alleviate detrimental side reactions, and suppress loss of the active material. Furthermore, the remaining issues associated with the current system were identified and future research directions were proposed. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect