1. Among them, the 20%-ASL alloy powder has the highest measured mass combustion enthalpy, 31739 J�g -1 , which is higher than the theoretical mass combustion enthalpy of the pure Al powder (31000 J�g -1 ). It is also higher than the measured mass combustion enthalpy of the Al-4.35Li alloy powder (30325 J�g -1 ) which has the same lithium content with 20%-ASL. The addition of Si element can effectively improve the energy performance of the Al-Li alloy powders. (3) Si element can effectively improve the oxidation resistance of the Al-Li alloy powders, so as to improve its storage stability. After being exposed in the air for 40 days, the measured mass combustion enthalpy of the 20%-ASL alloy powder decreased by only 5.5%, while the Al-4.35Li alloy powder decreased by 17.5%. This is because after the addition of Si element, Li element exists in the form of AlSiLi intermetallic compound inside the alloy particles, so that the content of Li element on the surface of the particles is significantly reduced;Thus
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