Disclosed in at least one embodiment herein is a battery separator comprising a substrate that may be polymeric and porous. The substrate may have ribs, protrusions, or ribs and protrusions on one or both faces or surfaces thereof. On at least one surface or face of the substrate, a material layer may be formed. The material layer may contain a material with an oil absorption value equal to or greater than 15 g oil/100 g of material. The battery separator disclosed herein is useful in a lead acid battery, particularly in a flooded lead acid battery or a valve-regulated lead acid (VRLA) battery. The battery separator described herein has many benefits including helping mitigate or prevent issues such as acid stratification and others that may deteriorate battery performance or battery life.

A lithium battery includes a wound core and tabs, in which the wound core is formed by stacking and winding an inner separator, a first electrode sheet, an outer separator, and a second electrode sheet; the inner separator is located at the innermost layer of the wound core, and each of the inner separator and the outer separator has a clamping section, a first straight section, and a tail laminating section, where the first straight section is located in front of the first electrode sheet, and the clamping section, the first straight section and the tail laminating section of the inner separator are respectively laminated with the clamping section, the first straight section and the tail laminating section of the outer separator; and a dry peeling force of each of the first straight sections of the inner separator and the outer separator is less than 8 N/m.

A lithium battery includes a wound core and tabs, in which the wound core is formed by stacking and winding an inner separator, a first electrode sheet, an outer separator, and a second electrode sheet; the inner separator is located at the innermost layer of the wound core, and each of the inner separator and the outer separator has a clamping section, a first straight section, and a tail laminating section, where the first straight section is located in front of the first electrode sheet, and the clamping section, the first straight section and the tail laminating section of the inner separator are respectively laminated with the clamping section, the first straight section and the tail laminating section of the outer separator; and a dry peeling force of each of the first straight sections of the inner separator and the outer separator is less than 8 N/m.

A lithium-ion cell includes a ribbon-shaped electrode-separator assembly having an anode, a cathode, and a separator. The electrode-separator assembly is in the form of a winding with two terminal end faces. The anode has a ribbon-shaped anode current collector with a free edge strip extending along a first longitudinal edge that is not loaded with negative electrode material. The cathode has a ribbon-shaped cathode current collector with a free edge strip extending along a first longitudinal edge that is not loaded with positive electrode material. The separator has at least one inorganic material that improves its resistance to thermal stress. The lithium-ion cell further includes a housing enclosing the electrode-separator assembly and a metallic contact element. The metallic contact element is connected to a respective first longitudinal edge of one of the current collectors by a weld.

A lithium-ion cell includes a ribbon-shaped electrode-separator assembly having an anode, a cathode, and a separator. The electrode-separator assembly is in the form of a winding with two terminal end faces. The anode has a ribbon-shaped anode current collector with a free edge strip extending along a first longitudinal edge that is not loaded with negative electrode material. The cathode has a ribbon-shaped cathode current collector with a free edge strip extending along a first longitudinal edge that is not loaded with positive electrode material. The separator has at least one inorganic material that improves its resistance to thermal stress. The lithium-ion cell further includes a housing enclosing the electrode-separator assembly and a metallic contact element. The metallic contact element is connected to a respective first longitudinal edge of one of the current collectors by a weld.

The present application relates to a separator, comprising a substrate and a coating formed on at least one surface of the substrate; wherein the coating comprises inorganic particles and organic particles, the organic particles comprise first organic particles and second organic particles both embedded in the inorganic particles and forming protrusions on the surface of the coating, the first organic particles have a number-average particle size of ≥8 μm; the second organic particles have a number-average particle size of ≥2 μm, and at least part of the second organic particles comprise a core structure and a shell structure. The present application also relates to a secondary battery comprising the separator, a device comprising the secondary battery and a method for preparing the separator.

Provided is a separator for a power storage device that combines high permeability and battery safety at high temperature. The separator for a power storage device has an inorganic content layer that contains inorganic particles and polyolefin resin. In a cross section of the inorganic content layer, a ratio b of the area occupied by the inorganic particles is 9-35% [inclusive], the ratio of the area occupied by vacancies is 20-60% [inclusive], and a TD direction heat shrinkage a at 150° C. of the separator for a power storage device is 4% or less.

There is provided a negative electrode (100) for a lithium ion secondary battery, in which a negative electrode active material layer (120) containing at least a negative electrode active material and a binder is formed on a current collector (110). An insulating layer (300) containing at least an insulating material and a binder is further provided on a surface of the negative electrode active material layer (120), the binder contained in the insulating layer (300) includes at least styrene-butadiene rubber and at least one selected from carboxymethyl cellulose and salts thereof, and the binder contained in the negative electrode active material layer (120) is at least one selected from polyacrylic acid and salts thereof.

There is provided a negative electrode (100) for a lithium ion secondary battery, in which a negative electrode active material layer (120) containing at least a negative electrode active material and a binder is formed on a current collector (110). An insulating layer (300) containing at least an insulating material and a binder is further provided on a surface of the negative electrode active material layer (120), the binder contained in the insulating layer (300) includes at least styrene-butadiene rubber and at least one selected from carboxymethyl cellulose and salts thereof, and the binder contained in the negative electrode active material layer (120) is at least one selected from polyacrylic acid and salts thereof.

A separator for a lithium secondary battery and a method for manufacturing the same. Particularly, the separator is obtained through immersed phase separation, the content of inorganic particles is controlled to a predetermined level, and a fluorine-based binder polymer is used in combination with a polyvinyl acetate polymer, and thus shows improved heat shrinkage and enhanced adhesion to an electrode.