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Understanding structure-function relationship in hybrid Co3O4-Fe2O3/C lithium-ion battery electrodes

journal contribution
posted on 23.09.2015, 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 Glushenkov
A 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 interfaces

Volume

7

Issue

37

Pagination

20736 - 20744

Publisher

American Chemical Society

Location

Washington, DC.

ISSN

1944-8252

Language

eng

Publication classification

C Journal article; C1 Refereed article in a scholarly journal

Copyright notice

2015, American Chemical Society