Latent　heat　thermal　energy　storage　based　on　solid-liquid　phase　change　material　has　a　huge　potential　in　dealing　with　mismatch　between　energy　demand　and　supply.　LiF–LiCl–Li2CO3　ternary　system　was　screened　out　for　high　temperature　energy　storage　material　due　to　its　good　thermophysical　properties.　Its　eutectic　composition　(XLiF　=　28.41　mol%,　XLiCl　=　55.09　mol%　and　XLi2CO3　=　16.50　mol%)　was　predicted　based　on　the　developed　thermodynamic　model　and　verified　experimentally.　The　melting　point,　phase　change　latent　heat,　heat　capacity,　thernal　diffusivity,　thermal　conductivity　and　thermal　stability　of　LiF–LiCl–Li2CO3　eutectic　mixture　were　measured.　And　the　influence　of　the　addition　of　multi-walled　carbon　nanotubes　(MWCNTs)　were　analyzed.　It　was　found　that　adding　MWCNTs　could　increase　the　latent　heat,　specific　heat　capacity,　thermal　diffusivity　and　thermal　conductivity　of　LiF–LiCl–Li2CO3　eutectic　mixture,　while　didn＇t　significantly　change　the　melting　temperature.　©　2022　Elsevier　B.V.