Non-aqueous electrolyte secondary battery
AssigneeSanyo Electric Co., Ltd.
InventorsAkihiro Tabushi, Yuu Takanashi
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Abstract
This non-aqueous electrolyte secondary battery has: an electrode body formed by winding, in a flat shape, a positive electrode and a negative electrode with a separator interposed therebetween; and a non-aqueous electrolyte. The positive electrode has a positive electrode mixture layer containing a positive electrode active material. In the positive electrode mixture layer, 0.10-0.30 mass % of ceramic particles are added, the volume-based median size (D50) of the ceramic particles is 0.5 μm or less, the air permeability of the separator is 165-310 sec/100 ml, and the air permeability of a flat portion of the separator with respect to the air permeability of a curved portion of the separator is 120-140%.
Claims4
A non-aqueous electrolyte secondary battery, comprising:
- an electrode assembly in which a positive electrode and a negative electrode are flatly wound with a separator interposed therebetween, the positive electrode having a positive electrode mixture layer including a positive electrode active material;
- and
- a non-aqueous electrolyte, wherein
- ceramic particles are added into the positive electrode mixture layer in an amount of 0.10 to 0.30 mass %,
- the ceramic particles have a median diameter on a volumetric basis (D50) of 0.05 μm to 0.5 μm,
- the separator has an air permeance of 165 to 310 sec/100-ml,
- an air permeance of a flat portion of the separator to an air permeance of a curved surface portion of the separator is 120 to 140%,
- the ceramic particles are insulative and are present on a surface of the positive electrode active material, and
- the ceramic particles are physically embedded in both surfaces of the positive electrode active material and the separator by press-forming the flatly wound electrode assembly.
Dependencies are inferred from the claim text.