ROLLED COPPER FOIL AND ANODE FOR LITHIUM ION SECONDARY BATTERY USING THE SAME

• Main Authors: SAWAI YOSHIKI, IWASAKI TOMIO
• Format: Patent
• Language: English; Korean
• Published: 07.02.2013
• Subjects: ALLOYS; BASIC ELECTRIC ELEMENTS; CHEMISTRY; ELECTRICITY; FERROUS OR NON-FERROUS ALLOYS; MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVINGMATERIAL; METALLURGY; PERFORMING OPERATIONS; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY; PUNCHING METAL; ROLLING OF METAL; TRANSPORTING; TREATMENT OF ALLOYS OR NON-FERROUS METALS

PURPOSE: A rolled copper foil is provided to have high strength, high heat resistance, high conductivity, and good processability, and to have high adhesion to a resin in a negative electrode active material. CONSTITUTION: A rolled copper foil with a current collector comprises Cu as a main component, and contains an additive element-A which consists of one or more kinds of atoms smaller than Cu, and inevitable impurities. If the sum of (atomic diameter difference between each component for the additive element-A and Cu)X(atomic% of the each additive component) is defined as a variation of atomic distance due to the additive element-A, the variation of atomic distance is -0.002 pm or less. If the total amount of the copper alloy composition is 100.0 parts by weight, the total amount of the additive element-A is 1.0 weight% or less. [Reference numerals] (AA) Ingot(step 1); (BB) Hot rolling step(step 2); (CC) Cold rolling step(step 3); (DD) Intermediate annealing step(step4); (EE) Raw material annealing(step 4'); (FF) Final cold rolling step(finishing rolling step(step 5); (GG) Copper foil(finishing copper foil)(step 6); (HH) Negative electrode manufacturing step(step 7); (II) Adequately repeating cold rolling and intermediate annealing steps