This　work　concerns　the　development　of　a　shape-stable　molten　salt　based　composite　phase　change　material　(PCM)　for　low　and　medium　temperature　thermal　energy　storage.　The　composite　is　fabricated　by　using　a　cold　compression　and　hot　sintering　method　with　the　employment　of　a　eutectic　quinary　nitrate　salt　of　NaNO3-NaNO2-KNO3-KNO2-LiNO3　as　PCM,　halloysite　nanotube　(HNT)　as　skeleton　supporting　material　and　natural　graphite　as　thermal　conductivity　enhancement　additive.　A　sequence　of　characterizations　is　performed　to　investigate　the　composite　microstructure,　chemical　and　physical　compatibility,　thermal　stability,　phase　change　behaviour,　and　thermal　conductivity　as　well　as　cycling　performance.　The　results　indicate　that　an　excellent　chemical　compatibility　has　been　achieved　among　the　ingredients　of　quinary　salt,　HNT　and　graphite　within　the　composite.　A　mass　concentration　of　50　wt%　HNT　endows　the　composite　with　the　optimal　formulation　in　which　10　wt%　graphite　can　be　successfully　accommodated　and　a　thermal　conductivity　around　1.31　W/m·K　can　be　acquired.　Moreover,　in　such　a　formulation,　the　composite　presents　a　considerably　low　melting　temperature　of　72.4　°C　and　a　high　thermal　decomposition　temperature　of　530　°C,　which　achieves　the　composite　a　relatively　high　energy　storage　density　nearly　500　kJ/kg　at　a　temperature　range　of　25–510　°C.　The　results　presented　in　this　work　demonstrate　that　the　quinary　salt-HNT-graphite　composite　with　fairly　low　phase　transition　temperature　and　a　splendid　combination　of　thermal　properties　and　cycling　performance　could　be　a　promising　candidate　to　replace　the　conventional　organic　based　PCMs　utilized　in　low　temperature　thermal　energy　storage　fields.　©　2023