LITHIUM ION SECONDARY BATTERY
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United States of America Patent
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Issued Date -
Jun 30, 2016
app pub date -
Dec 17, 2015
filing date -
Dec 17, 2015
priority date (Note) -
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Abstract
A lithium ion secondary battery includes: a positive electrode mixture layer provided on a main plane of a positive electrode current collector; and an insulator covering a part of a surface of a gradually-decreasing portion included in the positive electrode mixture layer. A first region is smaller than a second region on a cross-section of the lithium ion secondary battery that is orthogonal to the main plane, the first region being defined by a perpendicular line to the main plane passing a contact point between the surface of the gradually-decreasing portion and an end of the insulator, the main plane, and the surface of the gradually-decreasing portion, and the second region being defined by an orthogonal line orthogonal to the perpendicular line and in contact with an upper surface of the positive electrode mixture layer on a plane including the cross-section, the perpendicular line, and the surface of the gradually-decreasing portion.
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