This article studies the application of aluminum in stable metal composite phase change materials for energy storage. The research points out that metal phase change materials (PCMs) possess high thermal conductivity and high energy density, making them more efficient and longer lasting in energy storage systems. The experimental section details the preparation processes of C-Al and Al-Sn composite phase change materials, as well as their thermal cycling performance. The results indicate that the C-Al composite material exhibits low mass loss during thermal cycling, while the Al-Sn composite material demonstrates excellent thermal cycling performance under ideal microstructural conditions. The study also explores the impact of different experimental conditions on material properties and analyzes the microstructure and elemental distribution of the materials using scanning electron microscopy and energy dispersive spectroscopy. Ultimately, the research indicates that these metal composite phase change materials have promising applications in medium- to high-temperature energy storage.