Porous　LiFePO4　particles　have　been　investigated　as　cathode　materials　for　lithium　ion　batteries　by　introducing　supercritical　carbon　dioxide　(scCO(2)).　First　we　produced　LiFePO4　through　hydrothermal　method.　Then　scCO(2)　was　introduced　to　change　the　morphology　of　the　particle.　By　controlling　the　experiment　parameter,　porous　LiFePO4　was　finally　obtained.　A　solid-to-porous　transformation　mechanism　was　supposed　based　on　the　dissolution　of　LiFepO(4).　Electrochemical　measurements　showed　that　porous　structure　greatly　improved　the　performance　of　LiFePO4.　(C)　2013　Elsevier　Ltd.　All　rights　reserved.