Process and device for producing lithium-ion secondary battery

Abstract

Provided is a technique that is capable of efficiently and inexpensively producing a lithium-ion secondary battery in which stable battery performance and a high degree of freedom in shape are ensured and which can be made to have an improved output density and a reduced size. While forming a first vapor-deposited polymer film layer (26), a positive active material (24) is incorporated into the first vapor-deposited polymer film layer (26), thereby forming a positive-electrode layer (12). Meanwhile, while forming a second vapor-deposited polymer film layer (30), a negative active material (28) is incorporated into the second vapor-deposited polymer film layer (30), thereby forming a negative electrode layer (14). Furthermore, while forming a third vapor-deposited polymer film layer (32), a substance that imparts lithium-ion conductivity is incorporated into the third vapor-deposited polymer film layer (32), thereby forming a solid electrolyte layer (16). The positive electrode layer (12) and the negative electrode layer (14) are thereby superposed through the solid electrolyte layer (16) to form a layered object (18), and a lithium-ion secondary battery (10) having the layered object (18) is produced.

Description

technical field [0001] The present invention relates to a manufacturing method and a manufacturing device of a lithium ion secondary battery, and in particular to an all-solid lithium ion secondary battery having a laminated body (power generating element) in which a positive electrode layer and a negative electrode layer are laminated with a solid electrolyte layer interposed therebetween. The improvement of the manufacturing method of a battery, and the new structure of the manufacturing apparatus of the said lithium ion secondary battery. Background technique [0002] In general, lithium ion secondary batteries having high energy density are widely used as power sources in portable electronic devices such as notebook personal computers and mobile phones. In this lithium ion secondary battery, there are roughly two types, namely: a lithium ion secondary battery using a liquid type electrolyte (including a liquid electrolyte and a gel type electrolyte) for the electrolyte, ...

AI Technical Summary

Problems solved by technology

[0007] But on the other hand, in the manufacturing method of the lithium ion secondary battery, since the positive electrode layer, the negative electrode layer and the solid electrolyte layer are all composed of inorganic substances, the flexibility and softness of these layers are lacking, and, as A hard material is selected for the substrate (current collector, etc.) on which the positive electrode layer composed of sputtered film layers and the solid electrolyte layer are laminated, and there is a problem that the overall lithium-ion secondary battery has a structure with low bending strength.

In addition, the film formation rate (film formation amount per unit time) of the positive electrode layer and the sputtered film layer constituting the solid electrolyte layer is remarkably low, so there is also a cycle time required for the manufacture of one lithium-ion secondary battery. long question

Images