Surface　corrosion　from　electrolyte　and　reconstruction　of　layer-structure　LiCoO2　are　the　most　important　reasons　for　capacity　decay　and　charging　kinetics　limitation.　Spinel-type　material　forms　on　the　surface　of　LiCoO2　after　cycling,　which　is　more　stable　than　the　layer-structure.　To　stabilize　the　surface　and　suppress　the　reconstruction,　double　layer　structure　Li1.6Mg1.6Sn2.8O8　matching　LiCoO2　well　is　introduced　to　protect　Mg-doped　LiCoO2　and　restrain　the　structure　change.　With　a　simple　surface　coating　of　SnO2　and　further　high　temperature　treatment,　Mg2+　in　LiCoO2　and　partly　Li+　are　extracted　out　and　reacted　with　SnO2　to　form　double　layer　Li1.6Mg1.6Sn2.8O8.　Meanwhile,　Co3+　in　pristine　LiCoO2　is　partly　oxidized　and　electronic　conductivity　enhanced　after　surface　modification.　The　Li1.6Mg1.6Sn2.8O8　coating　efficiently　stabilizes　the　surface　structure　of　LiCoO2,　with　less　structure　change,　less　cracks　appearing　on　the　surface,　and　much　better　cycling　performance.　In　addition,　stable　surface　and　higher　electronic　conductivity　of　LiCoO2　lead　to　better　rate　performance.