The　ultrafast　charge/discharge　rate　and　high　power　density　(P-D)　endow　lead-free　dielectric　energy　storage　ceramics　(LDESCs)　with　enormous　application　potential　in　electric　vehicles.　However,　their　low　energy　storage　density　and　single　energy　storage　performance　(ESP)　limit　their　further　development　and　applicability　in　rugged　environments.　Here,　through　the　design　of　vacancy　defects　and　phase　structure　regulation,　Pb-free　(Bi0.5Na0.5)TiO3-based　ceramics　with　an　optimal　composition　can　achieve　a　large　maximum　polarization　(＞44　mu　C　cm(-2))　under　a　moderate　electric　field　(410　kV　cm(-1)),　resulting　in　an　extremely　high　recoverable　energy　storage　density　(approximate　to　6.14　J　cm(-3)),　nearly　ideal　energy　storage　efficiency　(91.32%),　a　very　short　time　(approximate　to　67　ns)　to　release　90%　of　the　energy,　and　a　high　P-D　(243.57　MW　cm(-3)).　More　importantly,　the　energy　storage　capacities　of　these　ceramics　remain　stable　over　a　wide　temperature　range　(25-220　degrees　C)　and　for　a　wide　range　of　fatigue　cycles　(1-10(6)).　Additionally,　the　real-time　temperature　sensing　performance　with　high　sensitivity　(with　a　relative　sensitivity　of　up　to　approximate　to　0.04　K-1)　in　the　ceramics　is　developed　based　on　Yb3+　and　Tm3+　codoping,　which　further　supports　the　potential　application　of　LDESCs　to　automotive　batteries　with　a　temperature　monitoring　function.