Nonaqueous electrolyte secondary battery
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United States of America Patent
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Aug 6, 2019
Grant Date -
Feb 1, 2018
app pub date -
Mar 8, 2016
filing date -
Mar 31, 2015
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Abstract
It is an object of the present invention to improve the low-temperature output characteristics of a nonaqueous electrolyte secondary battery. A nonaqueous electrolyte secondary battery according to an embodiment includes an electrode assembly having a structure in which a positive electrode and a negative electrode are stacked with a porous separator provided therebetween. The positive electrode contains tungsten and a phosphate compound. The separator contains a material having higher oxidation resistance than a polyethylene and has a pore distribution peak sharpness index of 40 or more in the range of 0.01 μm to 10 μm as calculated using formula 1: formula 1: pore distribution peak sharpness index=(peak value of Log differential pore volume)/(difference between maximum pore size and minimum pore size at position corresponding to ½ peak value of Log differential pore volume).
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