Lithium ion secondary battery positive pole piece and production method thereof

• Main Authors: LIU ENXIN, PENG ZHUO
• Format: Patent
• Language: English
• Published: 08.07.2015
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

The invention relates to the technical field of a lithium ion battery, and particularly relates to a lithium ion secondary battery positive pole piece and a production method thereof. The lithium ion secondary battery positive pole piece comprises active material lithium cobalt oxide or a mixture of lithium cobalt oxide and lithium manganate, a carbon nano-tube, acetylene black, a polyvinylidene fluoride adhesive and an NMP solvent, wherein the mass ratio of the active material lithium cobalt oxide or the mixture of the lithium cobalt oxide to the lithium manganate to the carbon nano-tube to the acetylene black to the polyvinylidene fluoride adhesive to the NMP solvent is 94.5: 1.5: 2: 2: 65. According to a positive pole formula, two conducting agents (carbon nano-tube and acetylene black) are added, and the extraction and insertion speed of lithium ions in a positive pole material can be increased by utilizing the synergistic effect of the tubular structure of the carbon nano-tube and the spotted conducting structure of the acetylene black, so that the gram volume of a battery main material and the rate discharge of the battery can be improved.