Kyocera Corporation

Energy Storage Materials Llc.

Seiichirou Hirahara

Maiko Nagayoshi

Youji Seki

Tomoyuki Ono

Fumito Furuuchi

Takaaki Tsurumi

Shuichi Kasai

Takashi Oto

The disclosure relates to an all-solid-state capacitor which has a high capacitance, is excellent in frequency characteristics, and can be made compact. An all-solid-state capacitor of the disclosure includes an inorganic solid electrolyte, and a pair of current collectors disposed so as to hold the inorganic solid electrolyte in between, the inorganic solid electrolyte having a main crystal phase of perovskite crystal structure that is expressed by a general formula, ABO. A-site elements include two different elements, namely Li and M which is at least one of elements in Group 2 of the Periodic Table of Elements, and B-site elements include two different elements, namely Ti and M' which is at least one of elements in Group 5 of the Periodic Table of Elements.

All-solid-state capacitor with solid electrolyte having a polycrystalline structure

All-solid-state capacitor includes an inorganic solid electrolyte, and a pair of current collectors disposed so that the inorganic solid electrolyte is interposed therebetween. In the all-solid-state capacitor, the inorganic solid electrolyte has a polycrystalline structure composed of crystal particles and crystal grain boundaries formed between the crystal particles. In a first crystal particle included in the crystal particles, a domain located near the crystal grain boundaries is larger in size than a domain located near the center.

All-solid-state capacitor

A dielectric material having a rutile crystalline structure includes Ti as a major constituent metal element, and, as metal elements other than Ti, a metal element M1 which includes at least one selected from among Ni, Co, and elements belonging to Group 2 according to a periodic table, and a metal element M2 which includes at least one selected from among elements belonging to Group 5 and Group 6 in the periodic table, and, on a basis of a total amount of Ti, the metal element M1, and the metal element M2, a molar ratio x of the metal element M1 is in a range of 0.005 to 0.025 and a molar ratio y of the metal element M2 is in a range of 0.010 to 0.050.

Dielectric material and electronic component

An all-solid-state capacitor includes an inorganic solid electrolyte; and a pair of current collectors disposed so as to hold it in between. The inorganic solid electrolyte has a polycrystalline structure, and the all-solid-state capacitor satisfies a relationship given as: R&#x3c;R&#x3c;R, a relationship given as: C&#x3c;C, and a relationship given as: C&#x3c;Cin which, R, Rand Rare resistance components, and Rdenotes an intragrain resistance of the inorganic solid electrolyte, Rdenotes a grain-boundary resistance of the inorganic solid electrolyte and Rdenotes an interfacial resistance between the inorganic solid electrolyte and the current collector, and, C, Cand Care capacitance components, and Cdenotes an intragrain capacity of the inorganic solid electrolyte, Cdenotes a grain-boundary capacity of the inorganic solid electrolyte and Cdenotes an interfacial capacity between the inorganic solid electrolyte and the current collector.

Growing community of inventors

Kirishima, Japan

Seiichirou Hirahara