Spherical　LiCoO2　particles　embedded　with　carbon　nanotubes　have　been　prepared　via　self-assembly　in　water/oil　microemulsion.　Mesoporous　spherical　LiCoO2　was　obtained　by　burning　out　the　carbon　nanotubes　at　300　degrees　C　in　an　O-2　atmosphere.　The　structure　and　morphology　of　the　mesoporous　particle　were　characterized　with　X-ray　diffraction,　scanning　electron　microscope,　and　Brunauer,　Emmett,　and　Teller　method.　It　revealed　that　the　mesoporous　particles　are　comprised　of　submicrometer-sized　LiCoO2　grains,　possessing　high　specific　surface　area　up　to　36　m(2)/g　and　with　an　average　mesopore　diameter　of　similar　to　22.5　nm.　The　synthesized　spherical　LiCoO2　shows　improved　reversibility　and　cyclability　at　high　rate　5　C.　(c)　2008　The　Electrochemical　Society.