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Battery cathode, composition for battery cathode catalytic layer, and battery

專(zhuān)利號(hào)
US11177484B2
公開(kāi)日期
2021-11-16
申請(qǐng)人
NISSHINBO HOLDINGS INC.（JP Tokyo）
發(fā)明人
Takeaki Kishimoto; Dustin William H Banham; Siyu Ye; Katie Ling Pei; Kyoung Bai
IPC分類(lèi)
H01M4/96; H01M4/90; H01M4/86; B01J23/80; B01J23/835; H01M8/10
技術(shù)領(lǐng)域
catalyst,cathode,platinum,layer,carbon,was,battery,in,carbonized,cm2
地域： Tokyo

摘要

A battery cathode, a composition for a catalyst layer of a battery cathode, and a battery, each achieves excellent performance while using a non-platinum catalyst. The battery cathode includes a catalyst layer, wherein the catalyst layer contains a non-platinum catalyst, has a thickness of 15 μm or more, and has a conductance per 1 cm2 of an electrode area of more than 100 S and less than 350 S.

說(shuō)明書(shū)

TECHNICAL FIELD

The present invention relates to a battery cathode, a composition fora catalyst layer of a battery cathode, and a battery.

BACKGROUND ART

Currently, a platinum catalyst is used for an electrode of a fuel cell. However, there are many problems to be solved. For example, the reserves of platinum are limited. In a polymer electrolyte fuel cell (PEFC), the use of platinum increases cost. In an air cell, the use of platinum increases cost, and in addition, platinum causes a chemical reaction, such as decomposition of an electrolyte solution.

Therefore, an alternative technology which does not use platinum has been developed. Specifically, for example, Patent Literature 1 discloses an electrode catalyst for a fuel cell formed of a carbonized material having a shell-like structure.

CITATION LIST

Patent Literature

[Patent Literature 1] JP 2007-207662 A

SUMMARY OF INVENTION

Technical Problem

However, when a non-platinum catalyst having low catalytic activity compared to platinum is used in a catalyst layer of a cathode of the fuel cell, there has hitherto been a problem in that the thickness of the catalyst layer is increased compared to that in a case of using platinum, resulting in a degradation of performance of the fuel cell.

The present invention has been made in view of the above-mentioned problem, and one of the objects of the present invention is to provide a battery cathode, a composition fora catalyst layer of a battery cathode, and a battery each achieving excellent performance while using a non-platinum catalyst.

權(quán)利要求

1
The invention claimed is:1. A battery cathode, comprising a catalyst layer,wherein the catalyst layer contains a mixture of a non-platinum catalyst having a particulate form with a median diameter of particles of the non-platinum catalyst being 600 nm or more and 1,000 nm or less, and an electrolyte material having an EW value of 300 or more and 900 or less,the non-platinum catalyst is dispersed in the electrolyte material,the catalyst layer has a thickness of 15 μm or more, a ratio of a weight of an electrolyte material to a total weight of the non-platinum catalyst and the electrolyte material contained in the catalyst layer of 32% or more and 48% or less, and a porosity of 43.0% or more and 66.0% or less, andthe catalyst layer has a conductance per 1 cm2 of an electrode area of more than 100 S and less than 350 S.2. The battery cathode according to claim 1, wherein the non-platinum catalyst is a carbon catalyst.3. The battery cathode according to claim 2, wherein the carbon catalyst contains a metal other than platinum.4. The battery cathode according to claim 1, wherein the battery cathode is a cathode of a fuel cell.5. A battery, comprising the battery cathode of claim 1.6. The battery according to claim 5, wherein the battery is a fuel cell.7. A composition for a catalyst layer of a battery cathode, which is used for forming a catalyst layer of a battery cathode and comprises a mixture of a non-platinum catalyst having a particulate form with a median diameter of particles of the non-platinum catalyst being 600 nm or more and 1,000 nm or less, and an electrolyte material having an EW value of 300 or more and 900 or less, the non-platinum catalyst being dispersed in the electrolyte material,wherein the composition is used for forming the catalyst layer having a thickness of 15 μm or more, a ratio of a weight of an electrolyte material to a total weight of the non-platinum catalyst and the electrolyte material contained in the catalyst layer of 32% or more and 48% or less, and a porosity of 43.0% or more and 66.0% or less, and having a conductance per 1 cm2 of an electrode area of more than 100 S and less than 350 S.
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