US-12620528-B2 - Conductor composition for electrode formation

Abstract

A conductive composition for electrode formation contains an organometallic compound containing a metal element, and an organic solvent. The conductive composition is substantially free of metal particles.

Inventors

• Nihiro UTSUMI
• Tetsuya Kimura
• Yusuke Azuma

Assignees

• KYOCERA CORPORATION

Dates

Publication Date

20260505

Application Date

20220712

Priority Date

20210720

Claims (4)

1. 1 . A conductive composition for electrode formation, the conductive composition consisting only of: an organometallic compound containing at least one base metal element; an organic solvent; and a dielectric material.
2. 2 . The conductive composition according to claim 1 , wherein the conductive composition includes two or more organometallic compounds, each containing a base metal element.
3. 3 . A conductive composition for electrode formation, the conductive composition consisting only of: an organometallic compound containing at least one base metal element; an organic solvent; a dielectric material; and a binder.
4. 4 . The conductive composition according to claim 3 , wherein the conductive composition includes two or more organometallic compounds, each containing a base metal element.

Description

TECHNICAL FIELD The present disclosure relates to a conductive composition for forming electrodes for multilayer capacitors. BACKGROUND OF INVENTION A known technique is described in, for example, Patent Literature 1. CITATION LIST Patent Literature Patent Literature 1: Japanese Unexamined Patent Application Publication No. 2005-93577 SUMMARY In an aspect of the present disclosure, a conductive composition for electrode formation contains an organometallic compound containing a metal element, and an organic solvent. The conductive composition is substantially free of metal particles. DESCRIPTION OF EMBODIMENTS The objects, features, and advantages of the present disclosure will become more apparent from the following detailed description and the drawings. A multilayer ceramic capacitor mainly includes a capacitor body and a pair of external electrodes outside the capacitor body. The capacitor body includes multiple dielectric layers and multiple internal electrodes alternately stacked on one another. One of the external electrodes is connected to a group of odd-numbered internal electrodes. The other external electrode is connected to a group of even-numbered internal electrodes. Example conductive pastes for forming electrodes for such a multilayer ceramic capacitor include a conductive paste containing an organometallic resinate, a metal powder that is a conductive filler, and an organic solvent described in Patent Literature 1. The recent trend toward miniaturization of electronic devices such as smartphones facilitates miniaturization of multilayer ceramic capacitors, causing each layer to be thinner. For the internal electrodes made of Ni or Cu, the inventors have noticed that internal electrodes made of a metal powder described in Patent Literature 1 contain coarse particles or aggregates in the metal powder, which break through dielectric layers during stacking or pressing and cause the internal electrodes above and below the dielectric layers to come in contact with each other, thus causing short-circuiting. Coarse particles in the metal powder are removed by classification or filtration for mass production. With classification, the classification accuracy may not be sufficiently high. The loss may also be large. With filtration, a known conductive paste, such as the conductive paste described in Patent Literature 1, which is highly viscous, takes a long time to pass through a filter. In response to the above, smaller multilayer ceramic capacitors with less short-circuiting during firing are awaited, and conductive compositions for electrode formation for manufacturing such capacitors are awaited. A conductive composition for electrode formation according to one or more embodiments of the present disclosure will now be described in detail. The conductive composition for electrode formation according to one or more embodiments of the present disclosure is not limited to the specific embodiments described below. The conductive composition for electrode formation according to one or more embodiments of the present disclosure may be embodied in various forms without departing from the spirit or the scope of the general idea defined by the appended claims. Organometallic Compound In one or more embodiments of the present disclosure, an organometallic compound contains a metal element. The organometallic compound may contain a base metal element, such as nickel, copper, cobalt, iron, tin, or zinc. The base metal element may specifically be nickel. Examples of the organometallic compound containing a metal element include compounds expressed by Formulas 1 to 6 below. Me-X—R   (1) (In the formula, Me is any metal, X is —S—, —O(CO)—, or —SO3—, and R is a hydrocarbon group having 1 to 15 carbon atoms and a linear or cyclic main chain.) R′—X′-Me-X—R   (2) (In the formula, Me is any metal, X and X′ are each —S—, —O(CO)—, or —SO3—, and R and R′ are each a hydrocarbon group having 1 to 15 carbon atoms and a linear or cyclic main chain.) R—X-Me-X—R   (3) (In the formula, Me is any metal, X is —S—, —O(CO)—, or —SO3—, and R is a hydrocarbon group having 1 to 15 carbon atoms and a linear or cyclic main chain.) (In the formula, Me is any metal, X, X′, and X″ are each —S—, —O(CO)—, or —SO3—, and R, R′, and R″ are each a hydrocarbon group having 1 to 15 carbon atoms and a linear or cyclic main chain.) (In the formula, Me is any metal, X and X′ are each —S—, —O(CO)—, or —SO3—, and R and R′ are each a hydrocarbon group having 1 to 15 carbon atoms and a linear or cyclic main chain.) (In the formula, Me is any metal, X is —S—, —O(CO)—, or —SO3—, and R is a hydrocarbon group having 1 to 15 carbon atoms and a linear or cyclic main chain.) The organometallic compounds containing a metal element expressed by Formulas 1 to 6 may be a compound of a carboxylic acid and a metal, or specifically, a carboxylic acid and nickel, a carboxylic acid and copper, a carboxylic acid and cobalt, a carboxylic acid and iron, a carboxylic acid