High-expansibility lithium battery pole piece and preparation method thereof

The invention provides a high-expansibility lithium battery pole piece and a preparation method thereof, and relates to the technical field of lithium battery pole pieces, the surface of the pole piece is provided with a coating material capable of causing expansion of the pole piece; the coating material is a liquid material without conductivity or a slurry material or a mixture of the liquid material and the slurry material; the coating material is one layer or multiple layers, the coating material uniformly covers the surface of the active layer, the active layer is a carbon-based active layer or a silicon-based active layer, and the coating material is deionized water or ceramic slurry or silicon dioxide or aluminum oxide or zirconium oxide or other materials without conductivity. The coating material is selected from any one or a mixture of more of the above materials, the coating mode of the coating material is one or more process combinations, and by using the high-expansibility pole piece disclosed by