Pole piece composite current collector for lithium ion battery and preparation method of pole piece composite current collector

• Main Authors: TAO QIONGCHENG, TANG JIAOJUN, WEN JIAXIN, ZHANG JIAN, GE ZHIMIN, LIU XINGYU, ZHANG QING
• Format: Patent
• Language: Chinese; English
• Published: 19.09.2023
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

The invention provides a pole piece composite current collector for a lithium ion battery and a preparation method of the pole piece composite current collector, and relates to the field of lithium ion batteries, the composite current collector comprises two layers of foils arranged up and down and a composite layer arranged between the foils, the composite layer is an interlayer between the two layers of foils, the surface of the composite foil is provided with a plurality of through holes, and the through holes are formed in the surface of the composite foil. The foil and the composite layer are pressed into a whole through external pressure, the thickness of a single layer of foil is 0.2-1 micrometer, a connecting part is arranged on the inner wall of the through hole, the outer contour of the extending part is in contact with the composite layer, and the composite layer is further fixed between the two pieces of foil after the two pieces of foil are welded through the connecting part. And the tensile stre