Dongguan Poweramp Technology Limited

Silin Huang

Sheng Cheng

Hongming Yu

Huixin Wang

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 CBis a ratio of a unit area capacity Csof the first anode region to a unit area capacity Cscof the first cathode region, a value Cis a ratio of a unit area capacity Csof the second anode region to a unit area capacity Cscof the second cathode region, wherein the surface coating of the cathode and/or anode is a partitioned coating including different active materials, and wherein CB&#x2265;CB.

Electrode and electrochemical device including the same

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 Cis a ratio of a direct current resistance value Rof the first anode region to a direct current resistance value Rof the first cathode region; wherein a value Cis a ratio of a direct current resistance value Rof the second anode region to a direct current resistance value Rof the second cathode region; and wherein C&#x3c;C.

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.

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Fujian, China

Silin Huang