LiCoPO4　micron-rods　with　an　average　diameter　of　about　500　nm　and　length　of　about　5　mu　m　were　synthesized　by　dispersant-aided　hydrothermal　method.　Poly(n-vinylpyrrolidone)　(PVP)　was　used　as　dispersant　in　the　hydrothermal　method.　The　starting　solution　and　the　concentration　of　dispersant　have　significant　influences　on　the　morphology　of　LiCoPO4,　and　the　electrochemical　performance　is　improved　via　controlling　the　particle　size　and　morphology　by　the　hydrothermal　method.　The　cell　using　smaller　particle　LiCoPO4　as　cathode　delivers　a　larger　capacity　and　lower　cell　polarization.