Method for producing electrochemical device
AssigneeMaxell Holdings, Ltd.
InventorsHideaki Katayama, Toshihiro Abe, Nobuaki Matsumoto
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Abstract
An electrochemical device of the present invention includes a positive electrode, a negative electrode, a non-aqueous electrolyte, and a separator. The separator includes a first porous layer composed mainly of a thermoplastic resin and a second porous layer composed mainly of insulating particles with a heat-resistant temperature of 150° C. or higher. The first porous layer is disposed to face the negative electrode.
Claims17
A method for manufacturing an electrochemical device comprising a spiral electrode body that comprises a positive electrode, a negative electrode, and a pair of separators, each of which includes a first porous layer having a shutdown function and a second porous layer integrated with the first porous layer,
- the method comprising:
- lapping the pair of separators one over the other so that the second porous layers of the respective separators are arranged inside, and wrapping the lapped separators around a winding shaft with the first porous layer facing the winding shaft;
- winding the positive electrode and the negative electrode with the pair of separators to form the spiral electrode body;
- and
- removing the wound electrode body from the winding shaft,
- wherein
- the first porous layer of each of the separators contains 50 vol % or more of a thermoplastic resin and the second porous layer of each of the separators contains an insulating filler with a heat-resistant temperature of 150° C. or higher and an organic binder for binding insulating filler particles, a content of the insulating filler in the second porous layer being 50 vol % or more.
A method for manufacturing an electrochemical device comprising a spiral electrode body that comprises a positive electrode and a negative electrode, each having an active material containing layer, and a pair of separators, each of which includes a first porous layer having a shutdown function and a second porous layer integrated with the first porous layer, and has different friction coefficients on both sides,
- the method comprising:
- lapping the pair of separators one over the other so that higher friction coefficient sides of the respective separators are arranged inside, and wrapping the lapped separators around a winding shaft with a lower friction coefficient side facing the winding shaft;
- forming the spiral electrode body by winding the positive electrode and the negative electrode with the pair of separators;
- and
- removing the wound electrode body from the winding shaft,
- wherein the first porous layer of each of the separators contains 50 vol % or more of a thermoplastic resin and the second porous layer of each of the separators contains an insulating filler with a heat-resistant temperature of 150° C. or higher and an organic binder for binding insulating filler particles, a content of the insulating filler in the second porous layer being 50 vol % or more.
Dependencies are inferred from the claim text.