The　effects　of　Nb2O5　addition　on　microstructures,　dielectric　breakdown　strength,　and　energy　storage　properties　of　BiFeO3-BaTiO3　(BF-BT)　ceramics　were　investigated.　X-ray　diffraction　patterns　suggested　a　perovskite　pseudocubic　structure　when　the　addition　content　was　less　than　3　mol%.　The　electrical　resistivity　of　1　mol%　Nb2O5-doped　BF-BT　ceramic　was　increased　by　approximately　six　orders　of　magnitude　compared　to　the　corresponding　undoped　composition.　The　dielectric　breakdown　strength　was　enhanced　with　increasing　Nb2O5　content　and　reached　a　maximum　value　at　the　composition　with　3　mol%　Nb2O5,　with　a　maximum　discharge　energy　density　of　0.71　J/cm(3)　at　90　kV/cm.　This　observation　suggests　that　Nb-doped　BF-BT　ceramics　can　be　considered　as　a　potential　lead-free　system　for　energy　storage　applications.　(C)　2014　Elsevier　B.V.　All　rights　reserved.