Abstract: An electrolyte and an electrochemical apparatus containing the electrolyte. The electrolyte includes a fluorine-containing sulfonimide lithium salt and a trinitrile compound, where based on a weight of the electrolyte, a percentage of the fluorine-containing sulfonimide lithium salt is X %, and a percentage of the trinitrile compound is Y %, where 1?X+Y?6. The electrolyte in this application can significantly improve safety performance of lithium-ion batteries.

Abstract: A negative electrode includes a current collector and a negative active material layer disposed on the current collector. The negative active material layer includes negative active material particles. The negative active material particles include secondary particles. The negative active material layer includes a pore A. A diameter of the pore A is 59 nm to 73 nm when tested by a mercury intrusion porosimetry. A ratio C004/C110 of the negative active material layer is 6 to 20. The electrochemical device using the negative electrode according to this application possesses a relatively high capacity and improved performance of resistance to cycle expansion.

Abstract: A binder is a polymer including structural units represented by a formula I, a formula II, and a formula III. R1 is selected from any one of a substituted or unsubstituted C1-C10 alkyl group, a substituted or unsubstituted C2-C10 alkenyl group, a substituted or unsubstituted C2-C10 alkynyl group, or a substituted or unsubstituted C6-C20 aryl group; R2 is selected from a phenolic hydroxyl group and the number of phenolic hydroxyl groups is 2 to 5; R3 is one of C, S, N, or P; X is selected from any one of Li, Na, or K; R4 and R5 each are independently selected from one of a hydrogen atom, a substituted or unsubstituted C1-C10 alkyl group, a substituted or unsubstituted C2-C10 alkenyl group, a substituted or unsubstituted C2-C10 alkynyl group, or a substituted or unsubstituted C6-C20 aryl group; and n1, n2, and n3 each are independently an integer greater than zero.

Abstract: An electrode assembly, where an outer surface of the electrode assembly includes a first surface, a first end face, a second surface, and a second end face that are connected in sequence, the first surface is provided opposite to the second surface, and the first end face is provided opposite to the second end face; a first adhesive layer, where the first adhesive layer is adhered to the first end face and extends from the first end face to the first surface and the second surface separately, and a side of the first surface provided with the first adhesive layer is defined as a top side; and a second adhesive layer, where the second adhesive layer is adhered to the second end face and extends from the second end face to the first surface and the second surface separately.

Abstract: A positive electrode includes a current collector and a positive electrode mixture layer provided on at least one surface of the current collector, the current collector includes a first region and a second region, the first region is coated with the positive electrode mixture layer, the second region is a foil-free region of the positive electrode, the positive electrode mixture layer includes a positive electrode active material and a binder, and a roughness Sa1 of a surface of a current collector of the first region and a roughness Sa2 of a surface of a current collector of the second region satisfy: 1?Sa1/Sa2?20. The positive electrode of the present application has a high compacted density and toughness, thereby improving the problem of brittle fracture of the positive electrode and improving the rate capability of a lithium-ion battery.

Abstract: A battery including a first conductive part, an electrode assembly, a second conductive part, and a first layer. The first conductive part includes a cover part and a concave part connected to the cover part. The concave part includes a first wall and a first side wall connected to the first wall. The electrode assembly is electrically connected to the first conductive part and the second conductive part, and is configured inside the concave part. Viewed in a first direction, the second conductive part and the electrode assembly partly overlap, the second conductive part is located in the first conductive part, the second conductive part includes a first surface and a second surface, and the second surface faces away from the first conductive part. The first layer includes a part located between the first conductive part and the second conductive part; and an insulating material.

Abstract: An electrochemical apparatus includes an electrode plate, where the electrode plate includes a current collector, a first layer, and a second layer. The first layer includes a conductive agent, where the conductive agent has a specific surface area (BET) of 60 m2/g to 1500 m2/g. The second layer includes an active material. The first layer is provided between the current collector and the second layer. The conductive agent having a large specific surface area increases the quantity of conductive network paths constructed per unit area, thereby achieving a better conductive connectivity, reducing electronic resistance of the electrode plate, and improving rate performance and cycling performance of the electrochemical apparatus.

Abstract: A positive electrode active material, where a surface region of the positive electrode active material includes a specific content of element aluminum. The positive electrode material of this application helps to improve the impedance, cycling performance, and high-temperature storage performance of electrochemical apparatuses under high-voltage operating conditions.

Abstract: A battery includes a housing, a cover, a sealing member, a connecting member, a cell, and a pole. The pole includes a substrate and a lead-out portion disposed on the substrate, where the lead-out portion includes a first portion, a second portion, and a mounting hole. The second portion is connected to an end of the first portion away from the substrate. The mounting hole is connected to the first portion and the second portion, where an opening of the mounting hole is located in the second portion. In a direction parallel to the substrate, minimum cross-sectional area of the first portion is greater than maximum cross-sectional area of the second portion. The pole has the first portion and the second portion of different cross-sectional areas disposed on the lead-out portion so that the second portion can be more easily riveted and bent against the first portion during riveting.

Abstract: A binding piece includes an insulation layer, a substrate layer, and at least one binding layer stacked together; where one of the at least one binding layer forms on an outer surface of the binding piece; where 10%?L2?100%, 1.2?L1/L2?20, L1 is an elongation rate of the insulation layer, and L2 is an elongation rate of the substrate layer.

Abstract: An electrochemical apparatus includes a positive electrode plate, a negative electrode plate, and a separator disposed between the positive electrode plate and the negative electrode plate, where the negative electrode plate includes a negative electrode current collector and a negative electrode active substance layer disposed on the negative electrode current collector, where the electrochemical apparatus has a first capacity a in the unit of mAh, the first capacity a is greater than 0, and the first capacity a represents a capacity when a battery that is prepared using the negative electrode plate and a lithium plate as a counter electrode of the negative electrode plate is charged to 2.0 V after the electrochemical apparatus has been discharged from a 100% state of charge (SOC) to 2.5 V.

Abstract: A current collector includes: an organic support layer; a conductive layer; an intermediate coating disposed between the organic support layer and the conductive layer, wherein the intermediate coating includes a resin composition at least including a first resin and a second resin; the adhesion of the first resin to the organic support layer is less than the adhesion of the second resin to the organic support layer; the adhesion of the first resin to the conductive layer is less than the adhesion of the second resin to the conductive layer.

Abstract: A separator includes: a first porous substrate; and a second porous substrate arranged on at least one surface of the first porous substrate; wherein the elongation at break of the second porous substrate is greater than the elongation at break of the first porous substrate in at least one of the machine and transverse directions of the separator. The separator has a high tensile strength and an elongation at break and good heat resistance, and may improve the safety performance of the energy storage device when the separator is applied to the energy storage device.

Abstract: An electrode plate includes a current collector and membranes disposed on a surface of the current collector, where at least one of the membranes is provided with a tab slot, the tab slot is apart from an edge of the electrode plate along a width direction, and the tab slot exposes the surface of the current collector; the membrane provided with the tab slot is provided with a notch connecting to the tab slot on a side, where the notch runs through the current collector along a direction perpendicular to the membrane, and the notch has an arc-shaped surface. The risk of a short circuit in the electrode assembly having the electrode plate can be decreased and safety performance of the battery can be improved.

Abstract: An electrochemical device includes an electrode plate, the electrode plate includes: a first current collector; a first tab protruding from the first current collector; a first active material layer disposed on at least one surface of the first current collector; and an insulation layer disposed along a side edge of the first current collector towards the first tab and abutted against the first active material layer. The insulation layer includes a first region and a second region, the first region is disposed towards the first tab, the second region is disposed away from the first tab and abutted against the first active material layer, and a thickness of the first region of the insulation layer is less than a thickness of the second region of the insulation layer.

Abstract: A battery pack, including a housing, a circuit board, and a plurality of electrode assemblies. The housing includes a first surface and a second surface opposite to each other. The first surface is provided with a plurality of first slots. The battery pack further includes a plurality of first caps, and the plurality of first caps respectively cover the plurality of first slots to form a plurality of mutually separated accommodation spaces. The electrode assemblies each includes an electrode plate assembly, a first electrode tab, and a second electrode tab. The electrode plate assembly is accommodated in the accommodating space. The first tab and the second tab extend out of the accommodating space. At least one first electrode tab and at least one second electrode tab are electrically connected to the circuit board. The structure and the manufacturing process of the battery pack can be simplified.

Abstract: The present application relates to a composite separator, and an electrochemical device and an electronic device comprising the same. Some embodiments of the present application provide a composite separator, comprising: a first porous substrate and a cation exchange layer, wherein the cation exchange layer comprises a second porous substrate grafted with a functional group, wherein the functional group is selected from the group consisting of an alkali-metal-sulfonic functional group, an alkali-metal-phosphoric functional group and a combination thereof. The composite separator of the present application can effectively capture the transition metal ions eluted from a cathode through the cation exchange layer, thereby reducing the deposition of the transition metal ions on an anode and the self-discharge rate of the electrochemical device.

Abstract: A cathode includes a current collector, a first material layer and a second material layer. The first material layer includes a first material. The second material layer includes a second material. The second material includes at least one of the followings compounds: phosphate represented by a general formula M1PO4 and lithium titanium phosphate represented by a general formula Li3Ti2-x M2x(PO4)3, and the second material layer is disposed between the current collector and the first material layer. The cathode of the present application is provided with a double-layer structure including at least one of phosphate and lithium titanium phosphate to avoid direct contact between the current collector in the cathode and an anode material layer and optimize the stability of the first material layer, so that the cycle performance, electrochemical stability and safety performance of the electrochemical device are significantly improved.

Abstract: A battery includes a packaging shell and a battery cell. The battery cell is disposed in the packaging shell, the battery cell includes a first electrode plate, the first electrode plate includes a first empty foil area and a second empty foil area where no active material is disposed on either side of the first electrode plate. The first empty foil area is arranged on a first surface, the second empty foil area is arranged on a second surface. At least one of the first surface and the second surface is adhered to the packaging shell by a bonding member. In a width direction of the battery cell, a width of the battery cell is W, a width of the first empty foil area is W1, a width of the second empty foil area is W2, and 0?(W1+W2)/W?40%.

Abstract: An electrochemical device includes a positive electrode, the positive electrode includes a positive electrode active material layer, the positive electrode active material layer includes a positive electrode active material and a composite carbon material. A is a volume of the positive electrode active material layer, B is a volume of pores having a pore diameter of less than 2 ?m in the positive electrode active material layer, and 14%?B/A?20%. The positive electrode active material layer includes the positive electrode active material and the composite carbon material, and 14%?B/A?20%, and indicates that the formed positive electrode has abundant pores for lithium ion transport.