A dielectric composition includes a main ingredient having a perovskite structure represented by ABO.sub.3, where A is at least one of Ba, Sr, and Ca and B is at least one of Ti, Zr, and Hf, and a first accessory ingredient. The first accessory ingredient comprises 0.1 mole or more of a rare earth element, 0.02 mole or more of Nb, and 0.25 mole or more and 0.9 mole or less of Mg, a sum of contents of the rare earth element and Nb is 1.5 mole or less.

A multilayer ceramic electronic component includes a laminate including dielectric ceramic layers and at least a pair of internal electrode layers laminated together, the laminate including a pair of main surfaces that oppose each other in a lamination direction, a pair of side surfaces that oppose each other in a width direction perpendicular or substantially perpendicular to the lamination direction, and a pair of end surfaces that oppose each other in a length direction perpendicular or substantially perpendicular to the lamination direction and the width direction, a pair of side surface layers respectively provided on the side surfaces of the laminate, a pair of main surface layers covering interfaces between the laminate and the side surface layers respectively provided on the main surfaces of the laminate, and a pair of external electrodes respectively connected to the internal electrode layers respectively provided on the end surfaces of the laminate.

A multilayer ceramic electronic component includes a laminate including dielectric ceramic layers and at least a pair of internal electrode layers laminated together, the laminate including a pair of main surfaces that oppose each other in a lamination direction, a pair of side surfaces that oppose each other in a width direction perpendicular or substantially perpendicular to the lamination direction, and a pair of end surfaces that oppose each other in a length direction perpendicular or substantially perpendicular to the lamination direction and the width direction, a pair of side surface layers respectively provided on the side surfaces of the laminate, a pair of main surface layers covering interfaces between the laminate and the side surface layers respectively provided on the main surfaces of the laminate, and a pair of external electrodes respectively connected to the internal electrode layers respectively provided on the end surfaces of the laminate.

Electrical energy storage device (1), including at least one electrical component (2) and a busbar (5) for electrical power distribution, where the electrical component (2) is arranged on the busbar (5), and at least a first contact side (11) and/or a second contact side (12) of the electrical component (2) is connected to the busbar (5) by a contact element (8), and wherein the contact element (8) is formed at least partially as a mesh (7). The electrical component (2) is preferably a capacitor.

A multilayer electronic component includes a multilayer body including dielectric layers and inner electrode layers. Each of the dielectric layers includes first crystal grains defining and functioning as plate-shaped objects that have an average thickness of less than or equal to about 300 nm and an average aspect ratio of more than or equal to about 5, each of the inner electrode layers includes second crystal grains defining and functioning as plate-shaped objects that have an average thickness of less than or equal to about 150 nm and an average aspect ratio of more than or equal to about 5, where an aspect ratio is represented by a ratio of a major axis of each plate-shaped object to a thickness of the plate-shaped object with the major axis of the plate-shaped object being orthogonal or substantially orthogonal to a thickness direction of the plate-shaped object.

A multilayer electronic component includes a multilayer body including dielectric layers and inner electrode layers. Each of the dielectric layers includes first crystal grains defining and functioning as plate-shaped objects that have an average thickness of less than or equal to about 300 nm and an average aspect ratio of more than or equal to about 5, each of the inner electrode layers includes second crystal grains defining and functioning as plate-shaped objects that have an average thickness of less than or equal to about 150 nm and an average aspect ratio of more than or equal to about 5, where an aspect ratio is represented by a ratio of a major axis of each plate-shaped object to a thickness of the plate-shaped object with the major axis of the plate-shaped object being orthogonal or substantially orthogonal to a thickness direction of the plate-shaped object.

A ceramic electronic component includes a body including a dielectric layer and an internal electrode; and an external electrode disposed on the body and connected to the internal electrode. The dielectric layer includes a plurality of grains and grain boundaries disposed between adjacent grains. The grain boundary includes a secondary phase including Sn, a rare-earth element, and a first subcomponent. The rare-earth element includes at least one of Y, Dy, Ho, Er, Gd, Ce, Nd, Sm, Tb, Tm, La, Gd and Yb. The first subcomponent includes at least one of Si, Mg, and Al.

A ceramic electronic component includes a body including a dielectric layer and an internal electrode; and an external electrode disposed on the body and connected to the internal electrode. The dielectric layer includes a plurality of grains and grain boundaries disposed between adjacent grains. The grain boundary includes a secondary phase including Sn, a rare-earth element, and a first subcomponent. The rare-earth element includes at least one of Y, Dy, Ho, Er, Gd, Ce, Nd, Sm, Tb, Tm, La, Gd and Yb. The first subcomponent includes at least one of Si, Mg, and Al.

A multilayer ceramic electronic component includes a ceramic body having first and second surfaces opposing each other in a first direction, third and fourth surfaces opposing each other in a second direction, and fifth and sixth surfaces opposing each other in a third direction; and an external electrode disposed on one of the third and fourth surfaces and extending onto the first and second surfaces of. A relational expression of 0.9≤A/BW<1.0 is satisfied, where a shortest distance, in the second direction, from an end portion of the ceramic body which the external electrode is disposed at to an end portion of the external electrode disposed on one of the first and second surfaces, is denoted by “A”, and a longest distance, in the second direction, from the end portion of the ceramic body to the end portion of the external electrode, is denoted by “BW”.

A multilayer ceramic electronic component includes a ceramic body having first and second surfaces opposing each other in a first direction, third and fourth surfaces opposing each other in a second direction, and fifth and sixth surfaces opposing each other in a third direction; and an external electrode disposed on one of the third and fourth surfaces and extending onto the first and second surfaces of. A relational expression of 0.9≤A/BW<1.0 is satisfied, where a shortest distance, in the second direction, from an end portion of the ceramic body which the external electrode is disposed at to an end portion of the external electrode disposed on one of the first and second surfaces, is denoted by “A”, and a longest distance, in the second direction, from the end portion of the ceramic body to the end portion of the external electrode, is denoted by “BW”.