Separator for non-aqueous secondary battery

Abstract

The invention relates to the field of a lithium-ion battery and specifically relates to a separator for a non-aqueous secondary battery. The separator for the non-aqueous secondary battery provided by the invention comprises a separator base material and a coating attached on the surface of the base material. The surface layer of the coating comprises an adhering area and an electrolyte diffusion area. According to the separator for the non-aqueous secondary battery provided by the invention, the adhering strength of the separator and an electrode can be improved, moreover, after a battery technology production process is carried out, and a pore structure can stilled be kept, thereby facilitating diffusion and conduction of electrolyte and reducing polarization impedance.

Description

technical field

[0001] The present application relates to the field of lithium ion batteries, in particular, to a diaphragm for a non-aqueous secondary battery. Background technique

[0002] Non-aqueous secondary batteries, especially lithium-ion secondary batteries, are widely used to power portable electronic devices such as notebook computers, digital cameras, video cameras and mobile phones due to their high energy density and good rate performance. In recent years, lithium-ion secondary batteries have been widely developed as power supplies for new energy vehicles. In recent years, in order to further increase the energy density, aluminum composite pouch batteries have been used. However, during the cycle, as the charge and discharge progress, a gap will be formed between the electrode and the separator, resulting in a decrease in cycle capacity and affecting life. Therefore, how to solve the problem of the gap between the separator and the electrode is one of the key...

Images