Multilayer electronic component and method for manufacturing dielectric composition

Abstract

A multilayer electronic component according to one embodiment of the present invention comprises: a first external electrode; a second external electrode; an internal electrode disposed between the first external electrode and the second external electrode; and a dielectric disposed between the first external electrode and the second external electrode, wherein the dielectric has a core-shell structure comprising a core and a shell having different ratios of a main component and an accessory component, the main component includes barium titanate (BaTiO3), and the accessory component includes calcium titanate (CaTiO3).

Description

Method for manufacturing laminated electronic components and dielectric compositions

[0001] An embodiment of the present invention relates to a method for manufacturing a laminated electronic component and a dielectric composition.

[0002] Semiconductor packages are used in various fields such as automobiles, communications, and computers, and typically include printed circuit boards (PCBs), semiconductor chips placed on the PCB, and electronic components placed on the PCB. Electronic components may include resistors, inductors, and capacitors, for example. A capacitor is a device that stores and supplies electricity, blocking direct current and allowing only alternating current to flow, thereby ensuring a constant current flow. Capacitors are also known as condensers or capacitors. With the advancement of semiconductor packaging, demand for high-performance, highly reliable, and ultra-small capacitors is increasing. The basic structure of a capacitor consists of two electrode plates facing each other with a dielectric material between them. The amount of charge accumulated can vary depending on factors such as the spacing and area of ​​the electrode plates and the material of the dielectric.

[0003] MLCC (Multilayer ceramic capacitor) is a type of ceramic capacitor that uses a ceramic material as a dielectric. It is formed by stacking multiple electrode layers and multiple dielectric layers, and the more layers there are, the larger the capacity of the MLCC can be.

[0004] As electronic devices become more miniaturized, the thickness of the MLCC dielectric layer is required to be reduced, and for this purpose, the main component, barium titanate (BaTiO3) ceramic material, is being granulated.

[0005] In general, to achieve temperature stability greater than X7R (capacitance value change ±15% from -55℃ to 125℃), it is desirable for the dielectric material to have a core-shell structure. When the dielectric material has a core-shell structure, the core and shell must be composed of an appropriate ratio and have a uniform shape, which is advantageous for the characteristics and reliability of the MLCC.

[0006] However, as the particle size of the main component (base material), barium titanate, has recently decreased, the size of the existing secondary component (additive) particles has become relatively larger, and as a result, the shell ratio in the core-shell structure has relatively increased, which has caused the dielectric properties to deteriorate. In addition, due to the decrease in dispersibility, the shell may not be formed in the area where the secondary component concentration is low, and the secondary phase may be formed in the area where the secondary component concentration is high without being dissolved in the main component, barium titanate. This deteriorates the temperature stability and reliability of the MLCC.

[0007] Therefore, there is a need for the development of a subcomponent suitable for forming a core-shell structure dielectric that allows for control of particle size, has excellent dispersibility, and does not generate secondary phases.

[0008] The technical problem to be achieved by the present invention is to provide a small-sized and high-capacity laminated electronic component.

[0009] The technical problem to be achieved by the present invention is to provide a laminated electronic component with improved dielectric properties through a method for manufacturing a dielectric composition capable of controlling the ratio of the core and shell of the dielectric.

[0010] A laminated electronic component according to one embodiment of the present invention includes a first external electrode, a second external electrode, an internal electrode disposed between the first external electrode and the second external electrode, and a dielectric disposed between the first external electrode and the second external electrode, wherein the dielectric has a core-shell structure in which the ratios of a main component and a secondary component are different, the main component includes barium titanate (BaTiO3), and the secondary component includes calcium titanate (CaTiO3).

[0011] The average size of the barium titanate particles may be in the range of 50 nm to 500 nm, and the average size of the calcium titanate particles may be in the range of 50 nm to 500 nm.

[0012] The above-mentioned auxiliary component may further include one or more metal oxides selected from silicon oxide, magnesium oxide, yttrium oxide, ytterbium oxide, and manganese oxide.

[0013] The above-mentioned dielectric may contain 0.5 to 2 mol of the calcium titanate relative to 100 mol of barium titanate.

[0014] The cross-sectional area ratio of the core and the shell may be in the range of 1:1 to 5:1.

[0015] The inner electrode may include a plurality of first inner electrode layers sequentially stacked and connected to the first outer electrode, and a plurality of second inner electrode layers sequentially stacked and connected to the second outer electrode, wherein the plurality of first inner electrode layers and the plurality of second inner electrode layers are alternately arranged, and the dielectric may be arranged between the plurality of first inner electrode layers and the plurality of second inner electrode layers.

[0016] A method for manufacturing a dielectric composition having a core-shell structure according to one embodiment of the present invention comprises the steps of: dispersing a main component including barium titanate (BaTiO3) and a secondary component including calcium titanate (CaTiO3) in water to manufacture a ceramic dispersion; spray-drying the ceramic dispersion; pressurizing and molding the dried ceramic dispersion; and sintering the molded ceramic dispersion.

[0017] In the method for manufacturing the above dielectric composition, the average size of the barium titanate particles may be in the range of 50 nm to 500 nm, and the average size of the calcium titanate particles may be in the range of 50 nm to 500 nm.

[0018] The above ceramic dispersion may contain 0.5 to 2 mol of the calcium titanate per 100 mol of the barium titanate.

[0019] The calcium titanate powder used in the method for manufacturing the above dielectric composition may be manufactured through a hydrothermal synthesis method using a solution containing a titanium precursor and a calcium precursor.

[0020] The above hydrothermal synthesis method can be performed under conditions ranging from pH 12.5 to 13.5.

[0021] The above ceramic dispersion may further include one or more metal oxides selected from silicon oxide, magnesium oxide, yttrium oxide, ytterbium oxide, and manganese oxide.

[0022] The above ceramic dispersion may further comprise a binder or a dispersant or a mixture thereof.

[0023] After the step of pressing and molding the above ceramic nano powder, a BBO (binder burout) process can be further performed.

[0024] According to an embodiment of the present invention, in a dielectric composition having a core-shell structure in which the ratios of the main component and the secondary component are different, by introducing calcium titanate having particle size controllability and excellent dispersibility as a secondary component, a uniform core-shell structure with a low shell ratio can be formed. Accordingly, after sintering of ceramic nanopowder, a secondary phase is not generated, and a dielectric composition having a core-shell structure with excellent dielectric properties and a high-capacity small electronic component such as a multilayer capacitor including the dielectric composition can be provided.

[0025] Fig. 1 is a perspective view of a laminated electronic component according to an embodiment.

[0026] Fig. 2 is a cross-sectional view of an electronic component according to an embodiment.

[0027] Fig. 3 is a top view of the dielectric and internal electrodes of an electronic component according to an embodiment.

[0028] Figure 4 is a schematic diagram showing the change in the core-shell structure of the dielectric according to the particle size of the main component and the secondary component.

[0029] Fig. 5 is a flowchart showing a method for manufacturing calcium titanate nanopowder according to an embodiment.

[0030] Figures 6 and 7 are X-ray analysis (XRD) graphs of calcium titanate nanopowder manufactured according to an embodiment.

[0031] Figure 8 is a scanning electron microscope (SEM) image of calcium titanate nanopowder manufactured according to an embodiment.

[0032] Figure 9 is a flowchart showing a method for manufacturing a dielectric composition according to an embodiment.

[0033] Figure 10 is a scanning electron microscope (SEM) image of a dielectric composition manufactured according to an example and a comparative example.

[0034] Figure 11 is a transmission electron microscope (TEM) image of a dielectric composition manufactured according to an example.

[0035] Figure 12 is a graph showing the dielectric constant and loss of the dielectrics manufactured according to the examples and comparative examples.

[0036] Figure 13 is a TCC (Time-Current Curve) comparison graph of examples and comparative examples.

[0037] Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the attached drawings.

[0038] However, the technical idea of ​​the present invention is not limited to some of the embodiments described, but can be implemented in various different forms, and within the scope of the technical idea of ​​the present invention, one or more of the components between the embodiments can be selectively combined or substituted for use.

[0039] In addition, terms (including technical and scientific terms) used in the embodiments of the present invention may be interpreted as having a meaning that can be generally understood by a person of ordinary skill in the technical field to which the present invention belongs, unless explicitly and specifically defined and described, and terms that are commonly used, such as terms defined in a dictionary, may be interpreted in consideration of the contextual meaning of the relevant technology.

[0040] Additionally, the terms used in the embodiments of the present invention are intended to describe the embodiments and are not intended to limit the present invention.

[0041] In this specification, the singular may also include the plural unless specifically stated otherwise in the phrase, and when it is described as “A and / or at least one (or more) of B, C”, it may include one or more of all combinations that can be combined with A, B, C.

[0042] Additionally, in describing components of embodiments of the present invention, terms such as first, second, A, B, (a), (b), etc. may be used.

[0043] These terms are intended only to distinguish one component from another, and are not intended to limit the nature, order, or sequence of the component.

[0044] And, when a component is described as being 'connected', 'coupled' or 'connected' to another component, it may include not only cases where the component is directly connected, coupled or connected to the other component, but also cases where the component is 'connected', 'coupled' or 'connected' by another component between the component and the other component.

[0045] Additionally, when described as being formed or arranged "above or below" each component, "above" or "below" includes not only cases where the two components are in direct contact with each other, but also cases where one or more other components are formed or arranged between the two components. Furthermore, when expressed as "above" or "below", it can include the meaning of a downward direction as well as an upward direction based on one component.

[0046] Hereinafter, embodiments will be described in detail with reference to the attached drawings. Regardless of the drawing numbers, identical or corresponding components are given the same reference numbers, and redundant descriptions thereof will be omitted.

[0047] Fig. 1 is a perspective view of an electronic component according to an embodiment of the present invention, Fig. 2 is a cross-sectional view of an electronic component according to an embodiment of the present invention, and Fig. 3 is a top view of a dielectric and internal electrodes of an electronic component according to an embodiment of the present invention. In this specification, an electronic component according to an embodiment of the present invention may mean an MLCC (multilayer ceramic capacitor).

[0048] Referring to FIGS. 1 to 3, an electronic component (100) according to one embodiment of the present invention includes a first external electrode (110), a second external electrode (120), an internal electrode (130), and a dielectric (140).

[0049] A pair of first external electrodes (110) and second external electrodes (120) are arranged to face each other. In this specification, the direction from the first external electrode (110) to the second external electrode (120) is referred to as a first direction. The first external electrode (110) and the second external electrode (120) may include a metal. For example, the first external electrode (110) and the second external electrode (120) may include at least one of nickel (Ni), copper (Cu), silver (Ag), palladium (Pd), and a silver-palladium (Ag-Pd) alloy, but are not limited thereto.

[0050] The inner electrode (130) is disposed between the first outer electrode (110) and the second outer electrode (120). The inner electrode (130) may include a plurality of first inner electrode layers (131) that are electrically connected to the first outer electrode (110) and sequentially stacked, and a plurality of second inner electrode layers (132) that are electrically connected to the second outer electrode (120) and sequentially stacked. The number of the plurality of first inner electrode layers (131) and the plurality of second inner electrode layers (132) included in one electronic component (100) may be tens, hundreds, or thousands, respectively.

[0051] A plurality of first internal electrode layers (131) and a plurality of second internal electrode layers (132) may be alternately arranged and spaced apart from each other. For example, a second internal electrode layer (132A) may be arranged and spaced apart from each other on a first internal electrode layer (131A), a first internal electrode layer (131B) may be arranged and spaced apart from each other on a second internal electrode layer (132A), and a second internal electrode layer (132B) may be arranged and spaced apart from each other on a first internal electrode layer (131B).

[0052] The stacking direction of the plurality of first internal electrode layers (131) and the plurality of second internal electrode layers (132) may be perpendicular to the first direction. In this specification, the stacking direction of the plurality of first internal electrode layers (131) and the plurality of second internal electrode layers (132) may be referred to as the second direction.

[0053] According to an embodiment of the present invention, the thickness of each of the plurality of first internal electrode layers (131) and the plurality of second internal electrode layers (132) may be 1 µm to 10 µm, preferably 3 µm to 8 µm, and more preferably 4 µm to 6 µm. As the thickness of each of the plurality of first internal electrode layers (131) and the plurality of second internal electrode layers (132) becomes thinner, the number of laminated layers may increase, and the capacity of the electronic component (100) may increase.

[0054] The dielectric (140) is disposed between the first external electrode (110) and the second external electrode (120). The dielectric (140) may be disposed within a spaced area between the first external electrode (110) and the second external electrode (120) and between the plurality of first internal electrode layers (131) and the plurality of second internal electrode layers (132). For example, the dielectric (140) may include a plurality of dielectric layers (141, 142, 143), and may have a structure in which the first internal electrode layer (131A), the dielectric layer (141), the second internal electrode layer (132A), the dielectric layer (142), the first internal electrode layer (131B), the dielectric layer (143), and the second internal electrode layer (132B) are sequentially stacked along the second direction.

[0055] The thickness of each of the plurality of first internal electrode layers and the plurality of second internal electrode layers may be 1 μm to 10 μm.

[0056] The thickness of the dielectric layer disposed between one of the plurality of first internal electrode layers and one of the plurality of second internal electrode layers may be 2 to 8 times the thickness of each of the plurality of first internal electrode layers and the plurality of second internal electrode layers, and the area of ​​the dielectric layer disposed between one of the plurality of first internal electrode layers and one of the plurality of second internal electrode layers may be 1.2 to 4 times the area of ​​each of the plurality of first internal electrode layers and the plurality of second internal electrode layers.

[0057] According to an embodiment of the present invention, the dielectric (140) includes a dielectric material having a core-shell structure. The dielectric material may include, for example, a perovskite oxide including Ba and Ti as a main component. For example, the main component (base material) of the dielectric material may be barium titanate (BaTiO3). In addition, the dielectric material may include a metal oxide such as calcium titanate (CaTiO3) as a secondary component.

[0058] According to an embodiment of the present invention, the dielectric composition may have a core-shell structure in which the ratios of the main component and the minor component are different, wherein the core has a higher ratio of the main component than the ratio of the minor component, and the shell has a lower ratio of the main component than the ratio of the minor component.

[0059] Figure 4 is a schematic diagram showing the formation and ratio of core-shell according to the particle size of the main component and secondary component of the dielectric material.

[0060] Figure 4 (a) is a drawing showing the core-shell structure of a dielectric including a conventional auxiliary component, and it can be seen that the proportion of the shell is high in the core-shell structure formed after sintering due to the auxiliary component (20) having a larger particle size than the barium titanate (BaTiO3) particle, which is the main component (10), and accordingly, it shows the problem of a decrease in dielectric constant and a decrease in electrostatic capacity of the MLCC.

[0061] As shown in (a) of Fig. 4, if the particle size of the auxiliary component (20) becomes larger than that of the main component (10), the dispersibility deteriorates, the shape of the shell becomes uneven, the part where the concentration of the auxiliary component (20) is low may not form a shell, and the part where the concentration of the auxiliary component (20) is high is likely to not be dissolved in barium titanate and to precipitate as a secondary phase (21). Accordingly, the dielectric properties of the dielectric deteriorate, and the temperature stability and reliability deteriorate.

[0062] FIG. 4(b) is a diagram showing a core-shell structure of a dielectric including a subcomponent (20) with controlled particle size according to an embodiment of the present invention. Since a subcomponent with a small particle size is used, the proportion of the shell in the core-shell structure formed after sintering is reduced, thereby increasing the dielectric constant and improving the electrostatic capacity of the MLCC. In addition, since the shell is uniformly formed by reducing the particle size of the subcomponent, it is possible to prevent the subcomponent from being precipitated as a secondary phase and deteriorating the dielectric properties.

[0063] Figure 5 is a process flow chart showing a process for manufacturing calcium titanate nanopowder through a hydrothermal synthesis method according to an embodiment of the present invention. After mixing a solution containing a titanium precursor and a calcium precursor, KOH is added and reacted at a pH range of 12.5 to 13.5, followed by a high-temperature heat treatment, and then the produced powder is recovered, washed, and dried to manufacture calcium titanate nanopowder. According to an embodiment, a calcium titanate powder having a smaller particle size can be manufactured through a hydrothermal synthesis method compared to a conventional solid-state method.

[0064] Referring to Fig. 5, a method for manufacturing calcium titanate nanopowder using a hydrothermal synthesis method can be specifically performed as follows.

[0065] First, prepare a titanium precursor solution by stirring titanium isopropoxide (Ti(OCH(CH3)2)4) and acetic acid (CH3CO2H) at room temperature for 30 minutes (S501). Prepare a calcium precursor solution by stirring calcium nitrate tetrahydrate (Ca(NO3)2·4H2O) and water at room temperature for 30 minutes (S502). Mix and stir the calcium solution and titanium solution so that the molar ratio of calcium and titanium becomes 1:1 to 1:2 (503). For example, mix so that the molar ratio of Ca:Ti becomes 1:1.7 and stir at room temperature for 30 minutes.

[0066] A mixture of the above calcium solution and the above titanium solution is introduced into an autoclave (S504), and then a potassium hydroxide (KOH) aqueous solution having a concentration of 6.0 M to 12 M is introduced and stirred at room temperature for 30 minutes at a pH range of 12.5 to 13.5 (S505).

[0067] After that, heat treatment is performed in an oven at approximately 200°C for 12 hours (S506), the powder is recovered, and then washed five times for 15 minutes at a speed of 5000 to 8000 rpm (S507). After that, it is dried at 120°C for 6 hours to obtain calcium titanate (CaTiO3) nanopowder (S508).

[0068] Below, the dielectric properties of the genome according to the type of auxiliary component are explained through comparative examples and examples.

[0069] In a comparative example, a dielectric was manufactured using a main component containing barium titanate (BaTiO3) and a secondary component containing commercial calcium carbonate (CaCO3) powder.

[0070] In the example, a dielectric was manufactured using a main component including barium titanate (BaTiO3) and a secondary component including calcium titanate (CaTiO3) nanopowder manufactured through a hydrothermal synthesis method.

[0071] FIG. 6 and FIG. 7 are XRD graphs of CaTiO3 nanopowder manufactured by a hydrothermal synthesis method according to an embodiment of the present invention, and FIG. 8 is a scanning electron microscope (SEM) image of CaTiO3 nanopowder manufactured according to an embodiment of the present invention.

[0072] Referring to FIGS. 6 and 7, it can be confirmed that CaTiO3 is synthesized under specific pH conditions (12.5 ≤ pH ≤ 13.5) as a result of hydrothermal synthesis under various conditions, and that the FWHM value of the (121) main peak appearing at 2θ = 33.14° is approximately 0.09, indicating strong crystallinity.

[0073] Referring to Fig. 8, it can be confirmed that the average size of the CaTiO3 particles manufactured by the hydrothermal synthesis method in the example is about 100 nm, and that they have a spherical shape that is advantageous for densification during sintering. From this result, it can be seen that the CaTiO3 particles synthesized according to the example have a similar size and shape to the main component BaTiO3, and can function as an effective additive in the manufacture of a dielectric composition with a core-shell structure.

[0074] FIG. 9 is a flowchart showing a method for manufacturing a dielectric composition according to an embodiment of the present invention.

[0075] Referring to FIG. 9, a method for manufacturing a dielectric composition having a core-shell structure includes a step (S901) of manufacturing a ceramic dispersion by dispersing a main component including barium titanate (BaTiO3) and a secondary component including calcium titanate (CaTiO3) in water; a step (S902) of forming a ceramic nanopowder by spray drying the ceramic dispersion; a step (S903) of pressurizing and molding the ceramic nanopowder; and a step (S905) of sintering the molded ceramic nanopowder.

[0076] The average size of the barium titanate particles included in the ceramic dispersion may be in the range of 50 nm to 500 nm, and the average size of the calcium titanate particles may be in the range of 50 nm to 500 nm.

[0077] The above ceramic dispersion may contain 0.5 to 2 mol of the calcium titanate per 100 mol of the barium titanate.

[0078] The above calcium titanate powder may be a nanopowder manufactured through the above-described hydrothermal synthesis method using a solution containing a titanium precursor and a calcium precursor.

[0079] The above ceramic dispersion may further include one or more metal oxides selected from silicon oxide, magnesium oxide, yttrium oxide, ytterbium oxide, and manganese oxide. For example, SiO, which may act as a sintering additive. 2, MgO and Mn3O2, which can act as donors or acceptors for the parent material barium titanate and calcium titanate during sintering in a reducing atmosphere. 4, Rare earth elements such as Y2O3 and Yb2O3 for controlling the rate of change in electrostatic capacity according to temperature. It may further include the following. The silicon oxide, magnesium oxide, yttrium oxide, ytterbium oxide, and manganese oxide may each be included as auxiliary components in a content ranging from 0.1 to 5 mol relative to 100 mol of the main component barium titanate (BaTiO3).

[0080] The above ceramic dispersion may use different dispersants depending on the dispersion solvent. When using an aqueous solvent, a dispersant such as PAA (Polyacrylic acid) may be included, and when using an organic solvent, a dispersant such as fish oil may be included. In addition, PVA (Polyvinyl alcohol), PVB (Polyvinyl butyral) or a mixture thereof may be further included as a binder, and accordingly, after the step of pressurizing and molding the ceramic nanopowder, a BBO (binder blowout) process (S904) may be further performed.

[0081] The above sintering step can be performed at a temperature range of 1,300°C to 1,350°C.

[0082] Below, the process for manufacturing a dielectric composition having a core-shell structure is described using a specific manufacturing example.

[0083] The ceramic dispersion was prepared by mixing the main and auxiliary components according to the composition described in [Table 1] below.

[0084] Dielectric material content (mol%)BaTiO3100CaTiO31.2SiO23MgO1Y2O32Yb2O32.13Mn3O40.374

[0085] A ceramic dispersion was prepared by adding the main component BaTiO3 and the secondary components CaTiO3, SiO2, MgO, Y2O3, Yb2O3, and Mn3O4 powders to deionized water in the amounts shown in [Table 1], mixing the binder and dispersant, and ball milling at 200 rpm for 24 hours. The BaTiO3 powder had an average particle size of approximately 300 nm, and the CaTiO3 was a nanopowder obtained through the hydrothermal synthesis method described above, and had a particle size of approximately 100 nm.

[0086] Ceramic nanopowder was prepared by spray drying a ceramic dispersion at 200°C and 3 L / h. The ceramic nanopowder obtained above was pressurized and molded at 100 MPa for approximately 1 minute. Thereafter, the temperature was increased at 3°C / min and maintained at 600°C for approximately 2 hours, during which a BBO (binder burout) process was performed.

[0087] Then, the temperature was increased at 5℃ / min and PO2=10 at 1,320℃ for about 2 hours. -10 The sintering process was carried out while maintaining low oxygen partial pressure.

[0088] Figure 10 is a scanning electron microscope (SEM) image of a dielectric composition manufactured according to an example and comparative example of the present invention.

[0089] Referring to (a) of Fig. 10, when a dielectric is manufactured using a commercial CaCO3 powder having a large particle size as a secondary component according to a comparative example, it can be confirmed that a secondary phase is formed due to the non-uniform distribution of the secondary component, and thus, it can be seen that a dielectric loss may be caused.

[0090] Referring to (b) of Fig. 10, when a dielectric is manufactured using CaTiO3 powder having a small particle size manufactured by a hydrothermal synthesis method as a secondary component according to an embodiment, it can be seen that uniform substitution with the main component BaTiO3 is possible through even dispersion of the secondary component, and the deterioration of dielectric properties is suppressed by preventing the formation of secondary phases.

[0091] Figure 11 is a transmission electron microscope (TEM) image of a dielectric composition manufactured according to an embodiment of the present invention.

[0092] Referring to Fig. 11, the core-shell structure within the crystal grains can be clearly confirmed in the microstructure of the sintered dielectric using CaTiO3 powder manufactured by a hydrothermal synthesis method according to an embodiment as an additive. (The core in the area inside the yellow dotted line where the ferroelectric domain is observed in a striped shape and the shell area outside the dotted line where the ferroelectric domain is not observed) Through this, it can be seen that the CaTiO3 particles synthesized according to the embodiment have a similar size and shape to the main component BaTiO3 and can function as an effective additive in the manufacture of a dielectric composition with a core-shell structure.

[0093] In the dielectric composition manufactured according to the embodiment of the present invention, the cross-sectional area ratio of the core and the shell may be 1:1 to 5:1. That is, it can be confirmed that the thickness of the shell relative to the thickness of the core is in the range of 20% to 100%.

[0094] Fig. 12 is a graph showing the dielectric constant and loss of the dielectrics manufactured according to the examples and comparative examples of the present invention, and Fig. 13 is a TCC (Time-Current Curve) comparison graph of the examples and comparative examples.

[0095] Referring to FIGS. 12 and 13, when a dielectric was manufactured using commercial CaCO3 powder as a secondary component according to a comparative example, it was found that a change in capacity of ±15% or more compared to the room temperature capacitance was observed in the temperature range of 135°C to 145°C, which does not satisfy the X8R class requirements.

[0096] On the other hand, when a dielectric was manufactured using CaTiO3 nanopowder manufactured by a hydrothermal synthesis method as a secondary component according to an embodiment, a room temperature permittivity of 1,400 and a stable dielectric loss value of less than 2% were observed, and the permittivity increased. In addition, it was confirmed that the X8R-class condition was satisfied by showing a capacity change of within ±15% compared to the room temperature capacitance in the entire range from 55℃ to 150℃.

[0097] In this way, according to an embodiment of the present invention, by introducing calcium titanate having controllable particle size and excellent dispersibility as a secondary component of a dielectric composition, an electronic component such as a laminated capacitor including a dielectric having a core-shell structure and excellent dielectric properties without generating a secondary phase can be provided.

[0098] Although the present invention has been described above with reference to preferred embodiments thereof, it will be understood by those skilled in the art that various modifications and changes may be made to the present invention without departing from the spirit and scope of the present invention as set forth in the claims below.

Claims

1. First external electrode, Second external electrode, an internal electrode disposed between the first external electrode and the second external electrode, and Including a dielectric disposed between the first external electrode and the second external electrode, The above genome has a core-shell structure with different ratios of main and secondary components, The above main ingredient contains barium titanate (BaTiO3), The above-mentioned auxiliary component is a laminated electronic component containing calcium titanate (CaTiO3).

2. In paragraph 1, The average size of the above barium titanate particles is in the range of 50 nm to 500 nm, A layered electronic component wherein the average size of the above calcium titanate particles is in the range of 50 nm to 500 nm.

3. In paragraph 1, The above dielectric is a layered electronic component comprising 0.5 to 2 mol of calcium titanate relative to 100 mol of barium titanate.

4. In paragraph 1, A laminated electronic component in which the cross-sectional area ratio of the core and the shell is in the range of 1:1 to 1:

5.

5. In paragraph 1, The inner electrode includes a plurality of first inner electrode layers sequentially stacked and connected to the first outer electrode, and a plurality of second inner electrode layers sequentially stacked and connected to the second outer electrode, wherein the plurality of first inner electrode layers and the plurality of second inner electrode layers are alternately arranged. A laminated electronic component in which the dielectric is disposed between the plurality of first internal electrode layers and the plurality of second internal electrode layers.

6. A step of preparing a ceramic dispersion by dispersing a main component containing barium titanate (BaTiO3) and a secondary component containing calcium titanate (CaTiO3) in water; A step of forming a ceramic nanopowder by spray drying the above ceramic dispersion; A step of pressing and molding the above ceramic nano powder; and A method for producing a dielectric composition having a core-shell structure, comprising a step of sintering the above-mentioned molded ceramic nanopowder.

7. In paragraph 6, The average size of the above barium titanate particles is in the range of 50 nm to 500 nm, A method for producing a dielectric composition wherein the average size of the calcium titanate particles is in the range of 50 nm to 500 nm.

8. In paragraph 6, A method for producing a dielectric composition, wherein the ceramic dispersion contains 0.5 to 2 mol of the calcium titanate relative to 100 mol of the barium titanate.

9. In paragraph 6, The above calcium titanate powder is a method for producing a dielectric composition, which is a nanopowder manufactured through a hydrothermal synthesis method using a solution containing a titanium precursor and a calcium precursor.

10. In paragraph 9, The above hydrothermal synthesis method is a method for producing a dielectric composition, which is performed under conditions in the range of pH 12.5 to 13.5.

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