Porous pole piece and forming method and application thereof

• Main Authors: WANG LEI, WANG YIFEI, SHIN YOUNG KWAN, ZHUANG HUAJIE
• Format: Patent
• Language: Chinese; English
• Published: 19.12.2023
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

The invention discloses a porous pole piece and a forming method and application thereof. The porous pole piece provided by the invention comprises a first coating, a metal foil and a second coating from top to bottom, the upper surface of the porous pole piece is provided with a row of indentations, and the indentations are dots or circles; the cross section of the indentation is in a V shape. The first coating and the second coating are provided with cracks at the V-shaped bottom; and the metal foil is broken at the V-shaped bottom to form a hole. According to the invention, the protruding part and the concave part of the stamping die or the meshing mechanism are utilized, so that the pole piece or the pole roll with the continuous surface is subjected to V-shaped deformation due to shear stress and then is cracked to form a pore structure, the rate capability of a battery cell is greatly improved by the obtained porous pole piece, and the cycle performance of a lithium battery can be obviously improved; an