Renewable Energy Global Innovations features: Fe-Based Metal-Organic Framework and Its Derivatives for Reversible Lithium Storage

Significance Statement

Researchers led by Professor Cai Shen from Ningbo Institute of Materials Technology and Engineering in China used iron-based metal organic framework as an anode for the first time in lithium ion battery applications. The research work is now published in Journal of Materials Science & Technology.

They synthesized MIL-88B_(Fe) as the iron-based metal organic framework followed by production of Fe₂O₃ and Fe₃O₄/C  composites via thermal treatment. In current density of 200mAg^-1, the columbic efficiency increases up to 100% of the 100th cycle with an increase in discharge and charge capacity. After 200 cycles, the cyclic performance of the metal organic framework was up to 700mA hg^-1 and reduced to an approximate value of 680mA hg^-1 after 500 cycles, showing a high cyclic stability. An increase in current density up to 2.0Ag^-1 maintained a capacity as high as 475mA hg^-1, indicating a high cyclic performance despite reduction in discharge capacity of the metal organic framework.

Following the successful preparation of Fe₂O₃ and Fe₃O₄/C composites, They found that the metal oxide of Fe₂O₃ had a discharge capacity of 460mA hg^-1 at a current density of 0.5C which remained after 100th cycle with a columbic efficiency of 100%. The discharge capacity was 180mA hg^-1 at a current density of 5C, but attained a discharge capacity of 700mA hg^-1 when current density was reversed to 0.2C, indicating high cycling stability.

For composites of Fe₃O₄/C, discharge capacity was approximately 800mA hg^-1 in the 100th cycle and attained a value of 928mA hg^-1 when the number of cycles was 200. As current density increases to 5C, a steady discharge capacity was attained, showing high cycling stability.

The iron-based metal organic framework MIL-88B(Fe) coupled with metal oxides of Fe₂O₃  and Fe₃O₄/C  composites both demonstrated high capacity and excellent cycling stability.

About The Author

Dr. Cai Shen received his Ph. D. in Chemistry from the University of St Andrews at UK in 2008. Before joining Ningbo institute of Materials Technology and Engineering, Chinese Academy of Science as an Associate Professor, he worked as a postdoc fellow in the University of Maryland (USA) and Aarhus University (Denmark).

His current research area involves lithium-ion batteries and the application of scanning probe microscopy techniques (in-situ electrochemical STM, AFM) to investigate the surface chemistry of nano materials.

Journal Reference

Jin, Y., Zhao, C., Lin, Y., Wang, D., Chen, L., Shen, C. Fe-Based Metal-Organic Framework and Its Derivatives for Reversible Lithium Storage, Journal of Materials Science & Technology (2016), doi: 10.1016/j.jmst.2016.11.021.

Chinese Academy of Sciences, Ningbo Institute of Materials Technology & Engineering, Ningbo 315201, China.

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