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2015 MRS Spring Meeting


I2.09 - Mgh2 as High Performance Anode Material for All Solid State Rechargeable Lithium Ion Batteries


Apr 7, 2015 4:15pm ‐ Apr 7, 2015 4:30pm

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Magnesium hydride MgH2, which is a well-known compound for hydrogen storage, had been investigated as a novel anode material for lithium�ion batteries reported by Oumellal et al.[1] The theoretical capacity of MgH2 is 2038 mA h g�1 if 2 Li+ incorporate into MgH2, which is almost 6 times to that of graphite. However, the capacity fades rapidly and reduces to less than 200 mA h g�1 after only 5 ~ 10 cycles [1,2], and no improvement had been done for years. In this study, we had successfully retained the reversible capacity of MgH2 electrode by using LiBH4 as a solid�state electrolyte. The result shows a stable reversible capacity of approximately 1230 mA h g�1 can be obtained in the cycling test at a current density of 100 mA g�1 between 0.3 and 1.0 V with nearly 100% capacity retention and 100% coulombic efficiency. The electrode evolution upon discharge�charge process at different stages had also been investigated in this study. This work opens a new way to look for high capacity anode materials for lithium�ion batteries. In addition, the electrochemical performance of numerous metal hydrides will be investigated by using LiBH4 based solid�state electrolytes. References: [1] Y. Oumellal, A. Rougier, G. A. Nazri, J. M. Tarascon, L. Aymard, Nat. Mater. 2008, 7, 916. [2] S. Brutti, G. Mulas, E. Piciollo, S. Panero, P. Reale, J. Mater. Chem. 2012, 22, 14531.

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