Abstract: A binder includes a polymer, the polymer is obtained by polymerizing a first monomer, a second monomer, a third monomer, and a fourth monomer, where the first monomer, the second monomer, and the third monomer are each independently selected from aromatic alkenyl compounds, ethylenically unsaturated carboxylic acids, ethylenically unsaturated carboxylic acid salts, or ethylenically unsaturated carboxylates, and the fourth monomer is selected from a substituted or unsubstituted cyclic compound having at least one double bond. The addition of the fourth monomer in this application can enhance the tensile strength and adhesive strength of the binder, suppress the volume expansion of electrode plates, and enable the formation of a networked structure in the polymer, improving the electrolyte resistance performance and consequently increasing the cycle life of batteries.

Abstract: A binder includes a polymer, the polymer is polymerized from a first monomer, a second monomer, a third monomer, and a fourth monomer. The first monomer, the second monomer, and the third monomer each are independently selected from an aromatic alkenyl compound, an olefinic unsaturated carboxylic acid, an olefinic unsaturated carboxylic acid salt, or an olefinic unsaturated carboxylic acid ester. The fourth monomer is selected from a substituted or unsubstituted compound containing an amine group and at least two alkenyl groups. By adding the fourth monomer into the binder, this application improves the electrolyte-resistant performance of the binder, improves the lithium-ion conduction performance of the binder, and in turn, improves the low-temperature discharge performance of the battery.

Abstract: A copolymer-containing binder and an electrochemical device containing the binder. The copolymer includes a polymer formed by copolymerizing a first monomer and a second monomer. The first monomer is a propylene monomer. A crystallinity of the copolymer is 10% to 40%. A molar percent of an amount of the first monomer in a total amount of all monomers in the copolymer is 30 mol % to 95 mol %. A molar percent of an amount of the second monomer in a total amount of all monomers in the copolymer is 5 mol % to 70 mol %. An electrode plate containing the binder according to this application is more resistant to powder flaking after being hot-calendered or wound, and is of higher quality. In addition, the binder is highly resistant to an electrolytic solution, thereby improving performance of the electrochemical device.

Abstract: An electrode assembly formed by winding a first electrode plate, a separator and a second electrode plate. The first electrode plate comprises a first current collector and a first active material layer arranged on a surface of the first current collector. A winding terminating end of the first electrode plate is positioned on an outer side of a winding terminating end of the second electrode plate facing away from a winding core. The first active material layer on the winding terminating end of the first electrode plate covers one surface of the first current collector facing toward the second electrode plate, The electrode assembly further comprises a first adhesive member arranged on an outer surface of the electrode assembly. The electrode assembly takes the winding terminating end of the first electrode plate as the tail end. The application further provides a battery having the same.

Abstract: An electrode assembly formed by winding a first electrode plate, a separator and a second electrode plate. A winding terminating end of the first electrode plate is positioned on an outer side of a winding terminating end of the second electrode plate facing away from a winding core. A first active material layer on the winding terminating end of the first electrode plate covers one surface of the first current collector facing toward the second electrode plate. The other surface of the first current collector on the winding terminating end of the first electrode plate facing away from the second electrode plate is not coated with the first active material layer. The electrode assembly does not have a plain aluminum foil at the outermost ring, which enhances the energy density of lithium-ion batteries and improves drop safety. The application further provides a battery having the same.

Abstract: The present application provides an electrode and an electrochemical device comprising the electrode. The electrode comprises a current collector; and an inorganic layer arranged on a surface of the current collector, wherein the inorganic layer comprises a metal oxide and does not comprise a polymer. The electrode of the lithium ion battery provided by the present application has little influence on the volume energy density of the lithium ion battery while improving the safety performance of the lithium ion battery.

Abstract: The present application provides an electrode and an electrochemical device comprising the electrode. The electrode comprises a current collector; and an inorganic layer arranged on a surface of the current collector, wherein the inorganic layer comprises a metal oxide and does not comprise a polymer. The electrode of the lithium ion battery provided by the present application has little influence on the volume energy density of the lithium ion battery while improving the safety performance of the lithium ion battery.

Abstract: An embodiment of the present application provides a negative electrode and a lithium ion battery including the negative electrode, the negative electrode includes a negative electrode current collector, and a negative electrode active material layer arranged on the negative electrode current collector, wherein the negative electrode active material layer includes a negative electrode active material and a dispersant, and the dispersant includes lithium carboxymethylcellulose, wherein the mass ratio of the negative electrode active material to the dispersant being ?18.74. The present application greatly reduces the DC resistance of the lithium ion battery and the charge transfer resistance at the interface without losing the energy density of the lithium ion battery, without affecting the cycle life of the lithium ion battery or causing cyclic expansion, which avoids the lithium precipitation phenomenon of the lithium ion battery during the cycle of charge and discharge.