Method for manufacturing electrode bodies and method for manufacturing non-aqueous electrolyte secondary batteries

Abstract

The present invention provides a method for manufacturing an electrode body that achieves both improved overcharge resistance and improved Li deposition resistance. [Solution] A method for manufacturing an electrode, comprising: a lamination step of forming a laminate by laminating a positive electrode and a negative electrode with a separator in between; a winding step of winding the laminate to form a wound body; and a pressing step of pressing the wound body to form a flat wound electrode body, wherein the pressing load in the pressing step is less than 140kN, the thickness of the separator in the wound electrode body is 16μm or more and 20μm or less, and when the pressing load is A (kN), the thickness of the separator in the wound electrode body is B (μm), and the thickness of the negative electrode in the wound electrode body is C (μm), [A ÷ (B / C)] is 190kN or more and 473kN or less.

Claims

1. A method for manufacturing an electrode body, A lamination process in which a positive electrode and a negative electrode are stacked with a separator in between to form a laminate, A winding step in which the laminate is wound to form a winding body, The process includes a pressing step of pressing the wound body to form a flattened wound electrode body, The pressing load in the aforementioned pressing process is less than 140 kN. The thickness of the separator in the wound electrode body is 16 μm or more and 20 μm or less. A method for manufacturing an electrode body, wherein, when the pressing load is A (kN), the thickness of the separator in the wound electrode body is B (μm), and the thickness of the negative electrode in the wound electrode body is C (μm), [A ÷ (B / C)] is 190 kN or more and 473 kN or less.

2. The method for manufacturing an electrode body according to claim 1, wherein the pressing load is greater than 50 kN.

3. The aforementioned press load is 60 kN or more and less than 130 kN. The method for manufacturing an electrode body according to claim 2, wherein the [A ÷ (B / C)] is 342 kN or more and 473 kN or less.

4. The method for manufacturing an electrode body according to claim 3, wherein the thickness of the negative electrode in the wound electrode body is 76 μm or more and 84 μm or less.

5. A method for manufacturing a non-aqueous electrolyte secondary battery, comprising the steps of: manufacturing an electrode body using the method for manufacturing an electrode body described in any one of claims 1 to 4; and manufacturing a non-aqueous electrolyte secondary battery comprising the electrode body and an electrolyte.

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