POSITIVE ELECTRODE, NONAQUEOUS ELECTROLYTE SECONDARY BATTERY, AND METHOD FOR MANUFACTURING POSITIVE ELECTRODE

• Main Authors: OCHIAI AKIHIRO, FUKUMOTO YUSUKE, ASARI TAKUYA, HETA KOJI, SHIMAMURA HARUNARI
• Format: Patent
• Language: English; Japanese
• Published: 12.09.2019
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

To suppress heat generation when a short circuit is caused by an impact from outside a battery or the like.SOLUTION: A positive electrode comprises at least a positive electrode current collector 110, a conductive material 12 and a positive electrode active material 10. The positive electrode active material 10 is disposed on a surface of the positive electrode current collector 110. The positive electrode current collector 110 includes a piece of aluminum foil 111 and an aluminum hydrous oxide film 112. The aluminum hydrous oxide film 112 covers a surface of the piece of aluminum foil. The aluminum hydrous oxide film 112 has a thickness of 10 nm or more and 500 nm or less. The aluminum hydrous oxide film 112 has a porosity of 10% or more and 50% or less. The conductive material 12 is at least partially disposed in cavities in the aluminum hydrous oxide film 112.SELECTED DRAWING: Figure 2 【課題】電池外部からの衝撃等により短絡が生じた場合に発熱を抑制すること。【解決手段】正極は正極集電体１１０、導電材１２および正極活物質１０を少なくとも含む。正極活物質１０は正極集電体１１０の表面に配置されている。正極集電体１１０はアルミニウム箔１１１およびアルミニウム水和酸化物膜１１２を含む。アルミニウム水和酸化物膜１１２はアルミニウム箔の表面を被覆している。アルミニウム水和酸化物膜１１２は１０ｎｍ以上５００ｎｍ以下の厚さを有する。アルミニウム水和酸化物膜１１２は１０％以上５０％以下の空隙率を有する。かつ導電材１２の少なくとも一部はアルミニウム水和酸化物膜１１２内の空隙に配置されている。【選択図】図２