Abstract
2LiBH4-MgH2 was employed as fast ionic conductor for the first time. The present work found that 2LiBH4-MgH2 composite offers σ of 10−2Scm−1 at a temperature over 373K, and possesses σ value 10 times higher than that of LiBH4 at a temperature below 373K. A window voltage of 4V can be achieved for 2LiBH4-MgH2 according to the cyclic voltammetry (CV for 5cycles) tests. X-ray diffraction (XRD) and Fourier Transform infrared spectroscopy (FTIR) measurements on 2LiBH4-MgH2 samples milled for different time demonstrate that original phases are well preserved during ball milling and temperature ramping even after CV tests. Their chemical stabilities were also demonstrated by differential scanning calorimetry (DSC) measurements. The enhanced lithium mobility at low temperature in 2LiBH4-MgH2 should be ascribed to the favorable boundaries, in which defects and amorphous phases were clearly observed by means of high-resolution transmission electron microscope (HRTEM).
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