LITHIUM-ION SECONDARY CELL
First Claim
1. A lithium-ion secondary cell, comprising:
- winding electrode assembly that comprises;
positive-electrode plate in which a positive-electrode active material mix layer is disposed on both sides of a positive-electrode metal current collector body and an exposed area of the positive-electrode metal current collector body is provided along one of long sides of the positive-electrode plate;
negative-electrode plate in which a negative-electrode active material mix layer is disposed on both sides of a negative-electrode metal current collector body and an exposed area of the negative-electrode metal current collector body is provided along one of long sides of the negative-electrode plate; and
separator arranged between the positive-electrode plate and the negative-electrode plate, wherein;
the exposed area of the positive-electrode metal current collector body is formed at one end in a winding axis direction of the winding electrode assembly, and the exposed area of the negative-electrode metal current collector body is formed at another end in the winding axis direction of the winding electrode assembly; and
the negative-electrode metal current collector body is a copper foil rolled to a thickness between 6 μ
m and 15 μ
m in which one or more of additive elements of Zr, Ag, Au, Pt, Cr, Cd, Sn, Sb, and Bi are added to Cu having a purity of equal to or greater than 99.9%, and the negative-electrode active material mix layer has a cavity volume ratio of between 30% and 60%.
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Accused Products
Abstract
A lithium-ion secondary cell includes a winding electrode assembly. The exposed area of the positive-electrode metal current collector body is formed at one end in a winding axis direction of the winding electrode assembly, and the exposed area of the negative-electrode metal current collector body is formed at another end in the winding axis direction of the winding electrode assembly; and the negative-electrode metal current collector body is a copper foil rolled to a thickness between 6 μm and 15 μm in which one or more of additive elements of Zr, Ag, Au, Pt, Cr, Cd, Sn, Sb, and Bi are added to Cu having a purity of equal to or greater than 99.9%, and the negative-electrode active material mix layer has a cavity volume ratio of between 30% and 60%.
21 Citations
5 Claims
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1. A lithium-ion secondary cell, comprising:
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winding electrode assembly that comprises; positive-electrode plate in which a positive-electrode active material mix layer is disposed on both sides of a positive-electrode metal current collector body and an exposed area of the positive-electrode metal current collector body is provided along one of long sides of the positive-electrode plate; negative-electrode plate in which a negative-electrode active material mix layer is disposed on both sides of a negative-electrode metal current collector body and an exposed area of the negative-electrode metal current collector body is provided along one of long sides of the negative-electrode plate; and separator arranged between the positive-electrode plate and the negative-electrode plate, wherein; the exposed area of the positive-electrode metal current collector body is formed at one end in a winding axis direction of the winding electrode assembly, and the exposed area of the negative-electrode metal current collector body is formed at another end in the winding axis direction of the winding electrode assembly; and the negative-electrode metal current collector body is a copper foil rolled to a thickness between 6 μ
m and 15 μ
m in which one or more of additive elements of Zr, Ag, Au, Pt, Cr, Cd, Sn, Sb, and Bi are added to Cu having a purity of equal to or greater than 99.9%, and the negative-electrode active material mix layer has a cavity volume ratio of between 30% and 60%. - View Dependent Claims (2, 3, 4, 5)
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Specification