Electrode plate for battery, polar plate group for battery, lithium secondary battery, method for manufacturing electrode plate for battery, and apparatus for manufacturing electrode plate for battery

Abstract

A battery electrode plate is provided with a double-side coated section (14) whereupon active material layers (13) are formed on the both surfaces of a power collection core material (12); a core material exposing section (18), which is an end section of the power collection core material (12) and does not have the active material layer (13) formed thereon; and a single-side coated section (17), which is arranged between the double-side coated section (14) and a core material exposing section (18), and has the active material layer (13) formed only one surface of the power collection core material (12). A plurality of groove sections (10) are formed on the both surfaces of the double-side coated section (14), and the groove section (10) is not formed on the singe-side coated section (17).

Description

technical field [0001] The present invention mainly relates to an electrode plate for a lithium secondary battery, a manufacturing method and a manufacturing device thereof, a pole plate group composed of the electrode plate, and a lithium secondary battery using the pole plate group. Background technique [0002] In recent years, lithium secondary batteries, which are widely used as driving power sources for portable electronic devices and communication devices, generally use carbonaceous materials that can intercalate / deintercalate lithium in the negative plate, and use LiCoO in the positive plate. 2 A complex oxide of a transition metal such as lithium and lithium is used as an active material, thereby forming a secondary battery with high potential and high discharge capacity. Furthermore, with the multifunctionalization of electronic equipment and communication equipment, further increase in capacity is desired. [0003] In order to realize a high-capacity lithium seco...

AI Technical Summary

Problems solved by technology

[0005] However, if the filling density of the active material of the electrode plate is increased, it is difficult to make the relatively high-viscosity non-aqueous electrolyte solution injected into the battery case soak into the high-density laminated or spirally wound electrode plate between the positive and negative plates through the separator. In the narrow gaps in the wound electrode plate group, there is the following problem: it takes a long time to wait until a predetermined amount of non-aqueous electrolyte solution is impregnated.

And because the filling density of the active material of the electrode plate increases, the porosity in the electrode plate decreases, and the electrolyte solution is difficult to infiltrate, so the impregnation of the nonaqueous electrolyte solution to the electrode plate group is seriously reduced. The problem described above: the distribution of the non-aqueous electrolyte in the plate group becomes uneven

[0007] However, the grooves formed on the surface of the negative electrode active material layer become the main cause of breaking the electrode plate when the electrode group is formed by winding the electrode plate.

Images