COPPER FOIL SHOWING SLACK RESISTANCE

• Main Authors: LIU YUEH-MIN, LAI YAO-SHENG, SHU ZUISHO, CHENG KUEI-SEN
• Format: Patent
• Language: English; Japanese
• Published: 25.01.2018
• Subjects: APPARATUS THEREFOR; BASIC ELECTRIC ELEMENTS; CHEMISTRY; ELECTRICITY; ELECTROFORMING; ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; METALLURGY; PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTIONOF COATINGS; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

PROBLEM TO BE SOLVED: To provide copper foil showing marvelous deformation resistance (e.g. slack resistance, sagging resistance, and wrinkle resistance).SOLUTION: Copper foil has a glossy surface of which the surface roughness (Rz) falls in a range of 0.6-1.9 μm, and a rough surface of which the surface roughness (Rz) falls in a range of 0.6-1.9 μm. In addition, the copper foil has a color value Lvalue of the rough surface which is within a range of 12-35 according to Labcolor system, and a tensile strength of 34.1 kg/mmor less. A negative electrode comprises a negative electrode current collector having a negative electrode active material, in which the negative electrode current collector includes the copper foil. The negative electrode is applied to a lithium ion secondary battery.SELECTED DRAWING: Figure 7 【課題】驚異的な耐変形性（たとえば、耐たるみ性、耐垂れ性、および耐しわ性）を表す銅箔の提供。【解決手段】表面粗度（Ｒｚ）が０．６〜１．９μｍの範囲にある光沢面、表面粗度（Ｒｚ）が０．６〜１．９μｍの範囲にある粗面、Ｌ*ａ*ｂ*表色系に準じて、１２〜３５の範囲にある粗面の明度Ｌ*値、および引張強度が３４．１ｋｇ／ｍｍ2以下である銅箔。更に、負極集電体に負極活物質を有する負極であって、前記負極集電体が前記銅箔を含む、負極。前記負極を適用するリチウムイオン二次電池。【選択図】図７