DE-102025129039-A1 - Active cathode material for chloride-ion battery and method for its production, cathode compound material for chloride-ion battery and chloride-ion battery

Abstract

An active cathode material for a chloride-ion battery according to the present invention is a strontium ruthenium oxide with a layered perovskite structure. A process for producing an active cathode material according to the present invention comprises (a) preparing a raw material mixture by mixing strontium carbonate and ruthenium oxide, (b) pelletizing the raw material mixture into pellets, and (c) firing the pellets. A cathode composite material for a chloride-ion battery according to the present invention comprises the active cathode material according to the present invention. The chloride-ion battery according to the present invention comprises a layer of active cathode material, and the layer of active cathode material contains the cathode composite material according to the present invention.

Inventors

• Hidenori Miki

Assignees

• TOYOTA JIDOSHA KABUSHIKI KAISHA

Dates

Publication Date

20260513

Application Date

20250723

Priority Date

20241111

Claims (5)

1. Active cathode material for a chloride-ion battery, wherein the active cathode material is a strontium ruthenium oxide with a layered perovskite structure.
2. Active cathode material according to Claim 1 , where the strontium ruthenium oxide is Sr 3 Ru 2 O x (5 ≤ x ≤ 7).
3. Cathode composite material for a chloride-ion battery, wherein the cathode composite material is the active cathode material according to Claim 1 or 2 includes.
4. Chloride-ion battery comprising a layer of active cathode material, wherein the layer of active cathode material comprises the cathode composite material according to Claim 3 contains.
5. Method for producing the active cathode material according to Claim 1 or 2 , wherein the process comprises: (a) producing a raw material mixture by mixing strontium carbonate and ruthenium oxide; (b) pelletizing the raw material mixture into pellets; and (c) burning the pellets.

Description

BACKGROUND OF THE INVENTION 1. Field of the invention The present invention relates to an active cathode material for a chloride-ion battery and a method for its production, a cathode composite material for the chloride-ion battery and the chloride-ion battery. 2. Description of the state of the art Metal chlorides are known as active cathode materials for chloride-ion batteries, as for example in Xiangyu Zhao et al., “Chloride-ion battery: a new member in the family of rechargeable batteries”, Journal of Power Sources 245 (2014) 706-711 , Ryo Sakamoto et al., “Room-temperature operation of all-solid-state chloride-ion battery with perovskite-type CsSn0.95Mn0.05Cl3 as a solid electrolyte, Electrochemistry, 91(7)” 077003 (2023 ) and Japanese unexamined patent application no. 2022-126132 ( JP 2022-126132 A ). SUMMARY OF THE INVENTION The object of the present invention is to provide a novel active cathode material for a chloride-ion battery and a method for its production, a cathode composite material for a chloride-ion battery comprising such an active cathode material, and a chloride-ion battery containing such a cathode composite material. The inventors have discovered that the aforementioned problems can be solved by the following measures. <Aspect 1> An active cathode material for a chloride-ion battery, wherein the active cathode material is a strontium ruthenium oxide with a layered perovskite structure. <Aspect 2> The active cathode material according to aspect 1, where the strontium ruthenium oxide is Sr 3 Ru 2 O x (5 ≤ x ≤ 7). <Aspect 3> A cathode composite material for a chloride-ion battery, wherein the cathode composite material comprises the active cathode material according to aspect 1 or 2. <Aspect 4> A chloride-ion battery with a layer of active cathode material, wherein the layer of active cathode material comprises the cathode composite material according to aspect 3. <Aspect 5> Method for producing the active cathode material according to aspect 1 or 2, wherein the manufacturing process comprises (a) Producing a mixture of raw materials by mixing strontium carbonate and ruthenium oxide, (b) Pelletizing the raw material mixture into pellets and (c) Burning the pellets. According to the present invention, a novel active cathode material for a chloride-ion battery and a method for its production, a cathode composite material for a chloride- An ion battery comprising such an active cathode material and a chloride ion battery comprising such a cathode composite material will be provided. BRIEF DESCRIPTION OF THE DRAWINGS Features, advantages and technical and industrial significance of exemplary embodiments of the invention are described below with reference to the accompanying drawings, in which the same reference numerals denote the same elements, and wherein: 1 a schematic cross-sectional view of an example of a chloride-ion battery according to the present invention; 2A an X-ray diffraction pattern (XRD pattern) of a battery according to an example; 2B an enlarged view of a range from 8° to 38° in the XRD pattern in 2A is; 3 The battery charging/discharging curves shown in the example are: 4 Charging/discharging curves of a battery according to a comparative example are; and 5 A diagram that shows the cycle characteristics of the battery according to the comparison example, i.e., a relationship between the number of charge/discharge cycles and the capacity. DETAILED DESCRIPTION OF THE EXECUTION FORMS One embodiment of the present invention is described in detail below. It should be noted that the present invention is not limited to the following embodiment and can be modified in various ways within the scope of the present invention. Active cathode material for chloride-ion battery An active cathode material for a chloride-ion battery according to the present invention is a strontium ruthenium oxide with a layered perovskite structure. The inventors in this case unexpectedly discovered that strontium ruthenium oxide with a layered perovskite structure functions as an active cathode material for a chloride-ion battery. The inventors also discovered that such an active cathode material can improve the cycle characteristics of a chloride-ion battery. The inventors concluded that the cycle characteristics of a battery incorporating a conventional active cathode material for a chloride-ion battery, which is a metal chloride, are poor for reasons such as the following. • The active cathode material, which is a metal chloride, dissolves easily in electrolyte solutions. • The charging/discharging of batteries containing active cathode material in the form of metal chlorides is carried out by a conversion reaction that results in strong expansion and contraction during charging and discharging, which tends to reduce the contact between the active cathode material and the electrolyte during the charge/discharge cycles. In contrast, it is assumed that an active cathode material for a chloride-ion batt