Pole piece, preparation method thereof and lithium ion battery

The invention belongs to the technical field of lithium ion batteries, and particularly relates to a pole piece, a preparation method thereof and a lithium ion battery, the pole piece is subjected to blank position setting through a label, and the label can limit the shape of a blank position which is reserved on a current collector and is used for welding a tab. By means of the shape of the label, enough space for tab welding can be reserved, capacity loss is reduced, the label is made of a metal base material, the edge shape is limited, the edge of a blank space can be clearer, and energy loss is reduced. When the prepared pole piece is applied to the lithium ion battery, the energy loss of the prepared lithium ion battery can be reduced, so that the capacity of the lithium ion battery is improved. 本发明属于锂离子电池技术领域，尤其涉及一种极片及其制备方法、锂离子电池，该极片通过标贴进行留白位设置，标贴可以对用于覆盖于集流体上预留用于焊接极耳的留白位的形状进行限定，通过标贴的形状可以预留出足够极耳焊接的空间，减少对容量的损失，且标签采用金属材质的基材对边缘形状进行限定，可使留白位边缘更加清晰，减少能量损失。将本发明制备得到的极片应用于锂离子电池中，制得的锂离子电池能减少能量损失，从而提升锂离子电池的容量。