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.
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.Go To Journal of Materials Science & Technology