In　order　to　fabricate　high　performance　dielectric　capacitors　for　pulsed　power　applications,　dense　and　homogenous　Bi(Mg2/3Nb1/3)O3-modifed　BaTiO3-based　Pb-free　relaxor　ferroelectric　ceramics　were　obtained　through　a　isostatic　pressing　technique　at　room　temperature.　Obvious　relaxor　behavior　with　a　high　diffusion　degree　is　confirmed　by　broad　and　frequency-dependent　dielectric　peaks　in　0.875BaTiO3-0.125Bi(Mg2/3Nb1/3)O3　(BT-0.125BMN).　Good　energy　storage　properties　including　a　high　recoverable　energy　density　of　∼1.89　J/cm3,　an　relatively　high　efficiency　of　∼83%,　good　dielectric/temperature/frequency　dependent　stability　and　also　fatigue　resistance　are　achieved　in　this　composition　at　a　high　electric　field　of　240　kV/cm,　together　with　a　fast　discharging　speed　of　2　and　a　large　power　density　of　25.12　MW/cm3.　These　properties　indicate　that　BT-0.125BMN　is　a　promising　candidate　of　capacitors　for　the　pulsed　power　applications.　©　2019　Elsevier　Ltd　and　Techna　Group　S.r.l.