A separator for a secondary battery, including a porous polymer substrate; a porous coating layer on at least one surface of the porous polymer substrate. The porous coating layer includes a plurality of inorganic particles and a first binder polymer that interconnects and fixes the inorganic particles; and an adhesive layer on a surface of the porous coating layer opposite to the porous polymer substrate. The adhesive layer includes a second binder polymer, and the adhesive layer includes a first layer in contact with the surface of the porous coating layer opposite to the porous polymer substrate, and a second layer integrated with the first layer and the second layer faces an electrode. The second layer has an average pore size larger than the average pore size of the first layer. The separator for a secondary battery can improve the problem related with resistance, while ensuring adhesion to an electrode.

A separator for a secondary battery, including a porous polymer substrate; a porous coating layer on at least one surface of the porous polymer substrate. The porous coating layer includes a plurality of inorganic particles and a first binder polymer that interconnects and fixes the inorganic particles; and an adhesive layer on a surface of the porous coating layer opposite to the porous polymer substrate. The adhesive layer includes a second binder polymer, and the adhesive layer includes a first layer in contact with the surface of the porous coating layer opposite to the porous polymer substrate, and a second layer integrated with the first layer and the second layer faces an electrode. The second layer has an average pore size larger than the average pore size of the first layer. The separator for a secondary battery can improve the problem related with resistance, while ensuring adhesion to an electrode.

A lithium-ion battery, including a battery cell, an electrolytic solution, and a packaging film. The battery cell is formed by winding a positive electrode plate and a negative electrode plate that are separated by a separator. The lithium-ion battery is half-charged to obtain a half-charged full battery. The half-charged full battery is stripped of the packaging film to obtain a half-charged cell. When a width of the half-charged full battery is w.sub.1, a width of the half-charged cell is w.sub.2, and g=w.sub.2/w.sub.1, the following conditional expression (1) is satisfied: 0.4<g<0.997. A negative active material of the negative electrode plate includes a silicon-based material. When a capacity per unit volume of the negative electrode plate is a, a and g satisfy the following conditional expression (2): 420 mAh/cm.sup.3<g×a<2300 mAh/cm.sup.3, where 619 mAh/cm.sup.3<a<3620 mAh/cm.sup.3. The present invention further provides an electronic device.

A lithium-ion battery, including a battery cell, an electrolytic solution, and a packaging film. The battery cell is formed by winding a positive electrode plate and a negative electrode plate that are separated by a separator. The lithium-ion battery is half-charged to obtain a half-charged full battery. The half-charged full battery is stripped of the packaging film to obtain a half-charged cell. When a width of the half-charged full battery is w.sub.1, a width of the half-charged cell is w.sub.2, and g=w.sub.2/w.sub.1, the following conditional expression (1) is satisfied: 0.4<g<0.997. A negative active material of the negative electrode plate includes a silicon-based material. When a capacity per unit volume of the negative electrode plate is a, a and g satisfy the following conditional expression (2): 420 mAh/cm.sup.3<g×a<2300 mAh/cm.sup.3, where 619 mAh/cm.sup.3<a<3620 mAh/cm.sup.3. The present invention further provides an electronic device.

A separator including a porous base and a coating layer on at least one surface of the porous base, the coating layer including (a) a carbon nanotube including an oxygen functional group and (b) a lithium ion conducting polymer, and a lithium-sulfur battery including the same. Such a separator may be capable of resolving problems caused by lithium polysulfide occurring in a lithium-sulfur battery.

The present disclosure pertains to vinylidene fluoride copolymers comprising recurring units derived from hydrophilic (meth)acrylic monomers and fluoro monomers compositions, and to their use in the manufacturing of battery components, such as membrane separators and electrode binders, to said battery components and to electrochemical devices comprising said components. Processes of making said copolymers and electrodes and separators including the copolymers are also described.

The present disclosure pertains to vinylidene fluoride copolymers comprising recurring units derived from hydrophilic (meth)acrylic monomers and fluoro monomers compositions, and to their use in the manufacturing of battery components, such as membrane separators and electrode binders, to said battery components and to electrochemical devices comprising said components. Processes of making said copolymers and electrodes and separators including the copolymers are also described.

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; the first organic particles and the second organic particles are embedded in the inorganic particles and form protrusions on the surface of the coating; the first organic particles have a number-average particle size of >10 μm, and the second organic particles have a number-average particle size of 2 μm-10 μm. 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.

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; the first organic particles and the second organic particles are embedded in the inorganic particles and form protrusions on the surface of the coating; the first organic particles have a number-average particle size of >10 μm, and the second organic particles have a number-average particle size of 2 μm-10 μm. 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.

The present invention pertains to a membrane for an electrochemical device, to a process for manufacturing said membrane and to use of said membrane in a process for manufacturing an electrochemical device.