US 2011/0212362 A1 · NON-AQUEOUS ELECTROLYTE SECONDARY CELL

Abstract

The object of the present invention is to provide a non-aqueous electrolyte secondary cell that excels in safety against overcharging and shows only a small increase in thickness during continuous charge. This object can be achieved by adopting the following configuration: a separator is used that is made of a microporous polyolefin membrane having an average pore diameter of 0.07 to 0.09 μm; a non-aqueous electrolyte contains 0.5 to 3.0 mass % of 1,3-dioxane, 0.05 to 0.3 mass % of adiponitrile, and 0.5 to 3.0 mass % of cyclohexylbenzene and/or tert-amylbenzene relative to the mass of the non-aqueous electrolyte; and preferably the non-aqueous electrolyte further contains 0.5 to 5.0 mass % of a vinylene carbonate and 0.1 to 2.0 mass % of 2-propyn-1-yl 2-(methylsulfonyloxy) propionate.

Claims8

Dependent claims

A non-aqueous electrolyte secondary cell comprising:

a positive electrode;
a negative electrode;
a separator separating the positive and negative electrodes;
and a non-aqueous electrolyte having a non-aqueous solvent and an electrolyte salt,
wherein:
the separator is made of a microporous polyolefin membrane having an average pore diameter of 0.07 μm or more;
the non-aqueous electrolyte contains 0.5 mass % or more of 1,3-dioxane, 0.05 mass % or more of adiponitrile, and 0.5 mass % or more of cycloalkylbenzene and/or a compound having a quaternary carbon adjacent to a benzene ring relative to the mass of the non-aqueous electrolyte;
and
the total mass ratio of the 1,3-dioxane, the cycloalkylbenzene and the compound having a quaternary carbon adjacent to a benzene ring is 7.0 mass % or less relative to the mass of the non-aqueous electrolyte.

6 more elements

Dependencies are inferred from the claim text.

Non-aqueous electrolyte secondary cell

Life of this patent

Non-aqueous electrolyte secondary cell

Life of this patent

Abstract

Claims8