Abstract: A separator and a preparation method of separator, a battery cell including the separator, a battery including the battery cell, and an electric device including the battery, where the separator includes at least two base films and a functional layer interposed between two adjacent base films, and the base film includes at least two components.

Abstract: A separator and a preparation method therefor, an electrode assembly, a secondary battery, a battery module, a battery pack and an electrical apparatus are disclosed. The separator comprises: a first microporous base membrane, a second microporous base membrane, and a coating disposed between the first microporous base membrane and the second microporous base membrane, wherein the coating comprises lithium-rich particles, and the ratio of the average particle size Dv50 of the lithium-rich particles to the thickness of the coating is 1:(1-15).

Abstract: Disclosed in the present application are a diaphragm and a manufacturing method therefor, and an electrode assembly, a battery cell, a battery and an electric device. The diaphragm comprises at least two layers of base membranes and at least one functional layer, wherein the functional layer is arranged between two adjacent base membranes, and the functional layer comprises a piezoelectric material. In the technical solution of the present application, the conductivity is increased, and the strength of the diaphragm is also improved by fixing the position of a piezoelectric material by means of two base layers of membranes and by means of the adhesion of a functional layer, which is sandwiched between the base membranes.

Abstract: Disclosed are a battery separator and a preparation method therefor, as well as a secondary battery and an electric device, relating to the field of batteries. The battery separator includes a base film and a coating, wherein the coating is disposed on a surface of the base film that faces the cathode of a battery. The coating comprises both a conductive material and an insulating material. When applied in a lithium battery, the separator functions such that, if lithium dendrites grow through the uncoated side of the base film, the coating intercepts the dendrites before they make direct contact with the cathode. This structure prevents a direct short circuit between the anode and cathode. Instead, a low-current micro-short circuit is formed through the coating, which effectively delays the onset of serious failure or thermal events. As a result, the separator improves the safety and operational reliability of the lithium battery.

Abstract: A separator film comprises a plurality of layers of microporous films, wherein an intermediate layer is provided between at least two layers of microporous films arranged to be adjacent to each other, and the intermediate layer includes a ferroelectric. In the solution of the present application, the separator film is configured to comprise a plurality of layers of microporous films, and an intermediate layer including a ferroelectric is provided between at least two layers of microporous films arranged to be adjacent to each other. Since the ferroelectric has a spontaneously polarized built-in electric field, which is equivalent to establishing an ion accelerator on an intermediate layer of the separator film, ions are accelerated under the action of the electric field when passing through the intermediate layer of the separator film.

Abstract: A composite separator comprises a plurality of laminated base film layers and at least one modified layer arranged between two adjacent base film layers, wherein the raw material components of the modified layer include a fullerene material. In the present application, using the fullerene material as the modified layer between two adjacent base film layers not only can improve the ion and electron conductivity of fullerene, but also can improve the porosity of fullerene, and improve the characteristics, such as liquid absorption capacity, wettability, air permeability and adhesion performance, of fullerene.