Core-shell　nanoparticles　used　as　blocks　to　construct　composite　ceramics　can　exhibit　high　energy　storage　density,　but　the　effects　of　original　tunable　shell　thickness　on　the　microstructures　and　energy　storage　property　of　finally　sintered　bulk　ceramics　has　not　been　clarified,　thus　how　to　achieve　the　full　potential　of　this　technology　to　improve　the　energy　storage　density　of　ferroelectric-based　ceramics　remains　to　be　solved.　In　this　study,　as　precursors　to　fabricate　bulk　ceramics,　BaTiO3@SiO2　core-shell　nanoparticles　were　successfully　synthesized　by　a　wet-chemical　method　and　they　were　used　as　models　to　investigate　the　effect　of　the　core-shell　nanostructured　precursors　on　the　energy　storage　property　of　the　bulk　composite　ceramics.　The　original　BaTiO3　nanoparticles　coated　with　various　homogenous　SiO2　shells　were　acquired　by　controlling　the　concentration　of　tetraethyl　orthosilicate　(TEOS).　The　surface　microstructure　of　the　bulk　composite　ceramics　observed　by　scanning　electron　microscope　(SEM)　revealed　that　the　SiO2　outer　shell　of　BaTiO3@SiO2　nanoparticles　plays　an　important　role　in　constructing　the　microstructure　of　the　ceramics.　The　remodeled　microstructure　has　a　great　impact　on　leakage　current　density　and　dielectric　property,　and　it　makes　a　leading　contribution　to　the　energy　storage　performance　of　ceramics.　As　a　result,　the　optimum　SiO2　loading　range　was　confirmed　and　the　maximum　energy　storage　density　obtained　from　BaTiO3@20　wt%SiO2　was　similar　to　4.799　J/cm(3)　at　370　kV/cm,　demonstrating　that　nanoscale　core-shell　architecture　is　an　effective　strategy　to　improve　the　energy　storage　performance　of　ferroelectric-based　composite　ceramics.　(C)　2019　Elsevier　B.V.　All　rights　reserved.