Hierarchically　structured　LiFePO　4　was　successfully　synthesized　by　ionic　liquid　solvothermal　method.　These　hierarchically　structured　LiFePO　4　samples　were　constructed　from　nanostructured　platelets　with　their　(010)　facets　mainly　exposed.　To　the　best　of　our　knowledge,　facet　control　of　a　hierarchical　LiFePO　4　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　LiFePO　4　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　LiFePO　4　sample　at　a　rate　as　high　as　20　C,　even　after　1000　cycles.