Abstract: Disclosed are a cathode plate and a preparation method therefor, and a lithium ion battery, which relate to the technical field of batteries. The cathode plate includes: a cathode current collector and a cathode film provided on the cathode current collector, wherein a cathode active material of the cathode film comprises a first active material, a second active material and a third active material, the first active material is a medium-nickel low-cobalt or cobalt-free transition metal oxide, the second active material is a high-nickel transition metal oxide, and the third active material is a lithium-containing phosphate having an olivine structure. A medium-nickel material and a high-nickel material are compounded, which can improve the energy density, low-temperature dynamic performance and cycle performance of the material; the phosphate material and the layered transition metal material have different discharge plateaus, which can improve the low-temperature power performance of the material.

Abstract: A battery cell is disclosed having a cathode including a cathode substrate with a surface coating of a first cathode active material in a first cathode region and a second cathode active material in a second cathode region, an anode including an anode substrate having a surface coating of a first anode active material in a first anode region and a second anode active material in a second anode region, wherein a value CB1 is a ratio of a unit area capacity CsA1 of the first anode region to a unit area capacity Csc1 of the first cathode region, a value CB2 is a ratio of a unit area capacity CsA2 of the second anode region to a unit area capacity Csc2 of the second cathode region, wherein the surface coating of the cathode and/or anode is a partitioned coating including different active materials, and wherein CB2?CB1.

Abstract: A circuit connection apparatus includes a first member and a second member sequentially stacked along a first direction. The first member is conductive. The first member includes a first section, a second section, and a third section. The first section and the second section are spaced apart in the first member. The third section is connected to the first section and the second section separately. The second member includes a boss extending toward the first member. Viewed along the first direction, the boss at least partly overlaps the third section. Along the first direction, the boss and the third section are interspaced with a clearance. The first member and the second member are able to approach each other. The boss is configured to be able to press against and be pressed by the third section to fracture the third section.

Abstract: A lithium secondary battery is disclosed which includes a cathode having a first cathode region and a second cathode region adjacent to the first cathode region, wherein the second cathode region is adjacent to an uncoated region of the cathode substrate; an anode, the anode having a first anode region and a second anode region adjacent to the first anode region, wherein the second anode region is adjacent to an uncoated region of the anode substrate, wherein a value C1 is a ratio of a direct current resistance value RA1 of the first anode region to a direct current resistance value RC1 of the first cathode region; wherein a value C2 is a ratio of a direct current resistance value RA2 of the second anode region to a direct current resistance value RC2 of the second cathode region; and wherein C2<C1.

Abstract: The present application provides an electrochemical device. The electrochemical device, comprising: a positive electrode; a negative electrode; and the separator, disposed between the positive electrode and the negative electrode, wherein the separator comprising a porous substrate, a first coating layer and a second coating layer, the first coating layer and the second coating layer are on a surface of the porous substrate, the first coating layer is disposed on at least one side of the second coating layer, the first coating layer includes a first binder, and the second coating layer includes a second binder, the adhesive force between the first coating layer and the positive electrode or the negative electrode is greater than the adhesive force between the second coating layer and the positive electrode or the negative electrode. The electrochemical device provided by the present application can further improve the cycle performance of the electrochemical device.

Abstract: The present application provides an electrochemical device. The electrochemical device, comprising: a positive electrode; a negative electrode; and the separator, disposed between the positive electrode and the negative electrode, wherein the separator comprising a porous substrate, a first coating layer and a second coating layer, the first coating layer and the second coating layer are on a surface of the porous substrate, the first coating layer is disposed on at least one side of the second coating layer, the first coating layer includes a first binder, and the second coating layer includes a second binder, the adhesive force between the first coating layer and the positive electrode or the negative electrode is greater than the adhesive force between the second coating layer and the positive electrode or the negative electrode. The electrochemical device provided by the present application can further improve the cycle performance of the electrochemical device.

Abstract: The present application relates to an electrode and an electrochemical device including the electrode. The anode of the present application includes a first anode region and a second anode region, wherein the unit area capacity CsA2 of the second anode region is greater than or equal to the unit area capacity CsA1 of the first anode region. The cathode of the present application includes a first cathode region and a second cathode region, wherein the unit area capacity CsC2 of the second cathode region is less than or equal to 98% of the unit area capacity CsC1 of the first cathode region. When the anode and/or cathode of the present application are/is applied to an electrochemical device, the formation of lithium dendrites can be effectively reduced, thereby improving the safety of the electrochemical device.

Abstract: The present application relates to an electrode and an electrochemical device including the electrode. An anode of the present application includes a first anode region and a second anode region, wherein a direct current resistance value RA2 of the second anode region is less than or equal to 98% of a direct current resistance value RA1 of the first anode region. A cathode of the present application includes a first cathode region and a second cathode region, wherein a direct current resistance value RC2 of the second cathode region is greater than a direct current resistance value RC1 of the first cathode region. When the anode and/or the cathode of the present application are/is applied to the electrochemical device, it can effectively reduce the formation of lithium dendrites, thereby improving the safety of the electrochemical device.

Abstract: The present application relates to an electrode and an electrochemical device including the electrode. The electrode includes a first region and a second region, wherein the electrode includes a substrate and an electrode active material coated on at least one surface of the substrate, and wherein the charge/discharge thickness difference of the electrode in the first region is ?D1, and the charge/discharge thickness difference of the electrode in the second region is ?D2, wherein ?D1 is less than ?D2. When the electrode of the present application is applied to the electrochemical device, the formation of lithium dendrites can be effectively reduced, and the safety of the electrochemical device can be improved.