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以LiAlH_4和LiBH_4为原料,采用球磨方法制备了Li-Al-B-H复合储氢体系,通过XRD、TG、DSC和SEM等研究手段对复合物的微观结构和性能进行表征。研究结果表明:LiAlH_4/2LiBH_4复合物加热至500℃时的放氢量达到9.7wt%,在450℃和8MPa H_2条件下的最大吸氢量达到6.8wt%。还计算了(LiAlH_4/2LiBH_4)复合物放氢反应的表观活化能,并对(LiAlH_4/2LiBH_4)复合物吸放氢反应的机理进行了讨论。
Li-Al-B-H composite hydrogen storage system was prepared by ball milling with LiAlH 4 and LiBH 4 as raw materials. The microstructure and properties of the composite were characterized by XRD, TG, DSC and SEM. The results show that the maximum hydrogen absorption of LiAlH 4/2 LiBH 4 composite reached 9.7 wt% when heated to 500 ° C and reached 6.8 wt% at 450 ° C and 8 MPa H 2. The apparent activation energy of (LiAlH_4 / 2LiBH_4) complex was also calculated and the mechanism of hydrogen absorption and desorption of (LiAlH_4 / 2LiBH_4) was also discussed.