LITHIUM SECONDARY BATTERY
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United States of America Patent
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Issued Date -
Apr 3, 2014
app pub date -
Nov 1, 2012
filing date -
Nov 1, 2011
priority date (Note) -
Abandoned
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Abstract
There is provided a lithium secondary battery. The positive electrode includes a positive electrode mixture layer provided on one side or both sides of the current collector. The positive electrode active material includes a lithium-containing composite oxide including lithium and a transition metal. At least a part of the lithium-containing composite oxide includes nickel as transition metal. The non-aqueous electrolyte includes a halogen-substituted cyclic carbonate at a content of 0.5 to 5 mass %, when manufacturing the lithium secondary battery. The side part of the battery case includes two wide surfaces opposed to each other. The two wide surfaces are wider than the other surfaces in a side view. The side part has such a cleavable groove that is cleaved when an internal pressure of the battery exceeds a threshold. The cleavable groove is provided at a portion to intersect with a diagonal of the wide surfaces in the side view.
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