Hierarchically　structured　LiFePO4　was　successfully　synthesized　by　ionic　liquid　solvothermal　method.　These　hierarchically　structured　LiFePO4　samples　were　constructed　from　nanostructured　platelets　with　their　(010)　facets　mainly　exposed.　To　the　best　of　our　knowledge,　facet　control　of　a　hierarchical　LiFePO4　crystal　has　not　been　reported　yet.　Based　on　a　series　of　experimental　results,　a　tentative　mechanism　for　the　formation　of　these　hierarchical　structures　was　proposed.　After　these　hierarchically　structured　LiFePO4　samples　were　coated　with　a　thin　carbon　layer　and　used　as　cathode　materials　for　lithium-ion　batteries,　they　exhibited　excellent　high-rate　discharge　capability　and　cycling　stability.　For　instance,　a　capacity　of　95%　can　be　maintained　for　the　LiFePO4　sample　at　a　rate　as　high　as　20　C,　even　after　1000　cycles.