CAJ | 학술논문

选择 Mg17Al12-氢化物作为失稳剂与 LiBH4进行球磨以改善 LiBH4体系的吸放氢性能。研究表明， LiBH4/Mg17Al12-氢化物复合体系发生两步放氢过程。复合体系在300°C开始放氢并在500°C下产生9.8%的放氢量。通过添加Mg17Al12-氢化物，LiBH4的放氢动力学得到有效改善，并且其放氢温度降低20°C。复合体系的放氢产物在450°C的首次再加氢容量可高达8.3%。XRD分析表明，复合体系在放氢过程中所形成的MgB2和AlB2可降低LiBH4的热力学稳定性，进而有效改善LiBH4/Mg17Al12-氢化物复合体系的可逆储氢行为。
선택 Mg17Al12-경화물작위실은제여 LiBH4진행구마이개선 LiBH4체계적흡방경성능。연구표명， LiBH4/Mg17Al12-경화물복합체계발생량보방경과정。복합체계재300°C개시방경병재500°C하산생9.8%적방경량。통과첨가Mg17Al12-경화물，LiBH4적방경동역학득도유효개선，병차기방경온도강저20°C。복합체계적방경산물재450°C적수차재가경용량가고체8.3%。XRD분석표명，복합체계재방경과정중소형성적MgB2화AlB2가강저LiBH4적열역학은정성，진이유효개선LiBH4/Mg17Al12-경화물복합체계적가역저경행위。
Mg17Al12-hydride (abbreviated as MAH) was selected as a destabilization agent to improve de/rehydrogenation properties of LiBH4. 58LiBH4+Mg17Al12-hydride composite was prepared by ball-milling. It is found that the dehydrogenation of ball-milled LiBH4/MAH composite presents a two-step reaction for hydrogen release. The composite starts desorbing hydrogen at about 300 °C and yields 9.8%of hydrogen (mass fraction) below 500 °C. By adding MAH, the dehydrogenation kinetics of LiBH4 is improved and the dehydrogenation temperature of LiBH4 is also lowered by 20 °C. High rehydriding capacity of 8.3% was obtained for the dehydrogenated composite in the first cycle at 450 °C. The XRD analysis shows the formation of MgB2 and AlB2 in the dehydrogenation process, which reduces the thermodynamics stability of LiBH4 system and is beneficial to the reversible hydrogen storage behaviors of LiBH4/MAH composite.