US 12,132,225 B2
Non-aqueous electrolyte secondary battery
Masanori Sugimori, Osaka (JP); Yasunori Baba, Hyogo (JP); Katsunori Yanagida, Hyogo (JP); and Nobuhiro Hirano, Osaka (JP)
Assigned to PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD., Osaka (JP)
Appl. No. 17/414,172
Filed by Panasonic Intellectual Property Management Co., Ltd., Osaka (JP)
PCT Filed Dec. 11, 2019, PCT No. PCT/JP2019/048585
§ 371(c)(1), (2) Date Jun. 15, 2021,
PCT Pub. No. WO2020/137561, PCT Pub. Date Jul. 2, 2020.
Claims priority of application No. 2018-243774 (JP), filed on Dec. 26, 2018.
Prior Publication US 2022/0037740 A1, Feb. 3, 2022
Int. Cl. H01M 50/446 (2021.01); H01M 4/02 (2006.01); H01M 10/0525 (2010.01); H01M 50/443 (2021.01); H01M 50/449 (2021.01)
CPC H01M 50/446 (2021.01) [H01M 50/443 (2021.01); H01M 50/449 (2021.01); H01M 2004/028 (2013.01); H01M 10/0525 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A non-aqueous electrolyte secondary battery comprising:
a positive electrode;
a negative electrode; and
a separator interposed between the positive electrode and the negative electrode, wherein
the separator comprises:
a porous base member that comprises polyolefin as a primary component;
a first filler layer which contains phosphate particles as a primary component, and which is placed over one surface of the porous base member; and
a second filler layer which contains one or more compounds selected from the group consisting of an aromatic polyamide, an aromatic polyimide, and an aromatic polyamideimide, and which is placed over the other surface of the porous base member,
a BET specific surface area of the phosphate particles is greater than or equal to 5 m2/g and less than or equal to 100 m2/g,
a content of the compound in the second filler layer is greater than or equal to 15 mass %,
a portion of the phosphate particles penetrates into pores of the porous base member, and
an average value of a penetration depth of the phosphate particles is greater than or equal to 0.1 μm and less than or equal to 2 μm.