Negative electrode for secondary batteries and method for producing same
AssigneeZeon Corporation
InventorTakuya Kaneda
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Abstract
A secondary battery negative electrode including a current collector, a negative electrode active material layer, and a porous membrane, wherein the negative electrode active material layer contains a negative electrode active material and a particulate negative electrode polymer, the porous membrane contains non-conductive particles and a porous membrane polymer that is a non-particulate cross-linked polymer, and the non-conductive particles are particles of a polymer that contains 50% by weight or more of a structural unit formed by polymerization of a (meth)acrylate, the polymer having a softening starting point or decomposition point of 175° C. or higher.
Claims10
A secondary battery negative electrode comprising a current collector, a negative electrode active material layer, and a porous membrane, wherein
- the negative electrode active material layer contains a negative electrode active material and a particulate negative electrode polymer,
- the porous membrane contains non-conductive particles and a porous membrane polymer that is a non-particulate cross-linked polymer, and
- the non-conductive particles are particles of a polymer that contains 98.8% by weight or more and 100% by weight or less of a structural unit formed by polymerization of a (meth)acrylate, the polymer having a softening starting point or decomposition point of 175° C. or higher.
A method for producing a secondary battery negative electrode including a current collector, a negative electrode active material layer, and a porous membrane, the method comprising:
- applying a negative electrode slurry containing a negative electrode active material, a particulate negative electrode polymer, and water onto the current collector and then drying the negative electrode slurry to thereby obtain the negative electrode active material layer;
- applying a porous membrane slurry onto the negative electrode active material layer and drying the applied porous membrane slurry, the porous membrane slurry containing:
- non-conductive particles that are particles of a polymer that includes 98.8% by weight or more and 100% by weight or less of a structural unit formed by polymerization of a (meth)acrylate and has a softening starting point or decomposition point of 175° C. or higher;
- a porous membrane polymer that is a non-particulate cross-linkable polymer;
- and a solvent;
- and
- cross-linking the porous membrane polymer by heating.
Dependencies are inferred from the claim text.