Effect of different additives on the properties of lithium alanate

LiAIH₄ doped with Ni and Ce(SO₄)₂ additives and the effect of doping on temperature and hydrogen release were studied by pressure-content-temperature (PCT) experiment and X-ray diffraction (XRD) analysis. It is indicated that doping with Ni induces a significant decrease in temperature in the first step and LiAlH₄ doped with 1mol% Ni presents the most absorption of hydrogen. Doping with Ce(SO₄)₂ also causes a marked decrease, while the amount of hydrogen release changes only slightly. The results from X-ray diffraction analysis show that doping does not cause any structural change; Ni and Ce-containing phases are not observed at room temoerature or even at 250℃.