Lithium Ion Battery
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United States of America Patent
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Issued Date -
Dec 11, 2014
app pub date -
Aug 13, 2012
filing date -
Feb 29, 2012
priority date (Note) -
Abandoned
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Abstract
In a lithium ion battery provided with a cleavage valve that discharges gas in accordance with an internal pressure rise, and a discharge capacity X of the battery being 30 Ah or more and less than 100 Ah, a positive electrode composite contains a mixed active material of layered lithium nickel manganese cobalt composite oxide (NMC) and spinel lithium manganese oxide (sp-Mn). A density of the positive electrode composite is 2.4 to 2.7 g/cm3, an application quantity of the positive electrode composite is 175 to 250 g/cm2, and when a weight ratio (NMC/sp-Mn) is defined as Y, a relation of Y<−0.0062X+1.05 is satisfied. Also, a working pressure of the cleavage valve is 1.0 to 5.0 MPa when the discharge capacity X is 30 Ah or more and 40 Ah or less, and 1.0 to 4.0 MPa when X is more than 40 Ah and 80 Ah or less.
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