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Understanding structure-function relationship in hybrid Co3O4-Fe2O3/C lithium-ion battery electrodes
journal contribution
posted on 2015-09-23, 00:00 authored by Irin Sultana, Md Mokhlesur RahmanMd Mokhlesur Rahman, Thrinath Ramireddy, N Sharma, Debasis Poddar, A Khalid, H Zhang, Ying (Ian) ChenYing (Ian) Chen, Alexey GlushenkovA range of high-capacity Li-ion anode materials (conversion reactions with lithium) suffer from poor cycling stability and limited high-rate performance. These issues can be addressed through hybridization of multiple nanostructured components in an electrode. Using a Co3O4-Fe2O3/C system as an example, we demonstrate that the cycling stability and rate performance are improved in a hybrid electrode. The hybrid Co3O4-Fe2O3/C electrode exhibits long-term cycling stability (300 cycles) at a moderate current rate with a retained capacity of approximately 700 mAh g(-1). The reversible capacity of the Co3O4-Fe2O3/C electrode is still about 400 mAh g(-1) (above the theoretical capacity of graphite) at a high current rate of ca. 3 A g(-1), whereas Co3O4-Fe2O3, Fe2O3/C, and Co3O4/C electrodes (used as controls) are unable to operate as effectively under identical testing conditions. To understand the structure-function relationship in the hybrid electrode and the reasons for the enhanced cycling stability, we employed a combination of ex situ and in situ techniques. Our results indicate that the improvements in the hybrid electrode originate from the combination of sequential electrochemical activity of the transition metal oxides with an enhanced electronic conductivity provided by percolating carbon chains.
History
Journal
ACS applied materials and interfacesVolume
7Issue
37Pagination
20736 - 20744Publisher
American Chemical SocietyLocation
Washington, DC.Publisher DOI
ISSN
1944-8252Language
engPublication classification
C Journal article; C1 Refereed article in a scholarly journalCopyright notice
2015, American Chemical SocietyUsage metrics
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No categories selectedKeywords
Li-ion batteriescycling stabilityex situ SEMhybrid electrodesin situ synchrotron XRDScience & TechnologyTechnologyNanoscience & NanotechnologyMaterials Science, MultidisciplinaryScience & Technology - Other TopicsMaterials ScienceENERGY-STORAGEANODEALPHA-FE2O3PERFORMANCECO3O4INTERCALATIONREDUCTIONNANOTUBESEVOLUTIONNANORODS
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