US 12,224,452 B2
Nonaqueous electrolyte secondary battery including separator with filler layers on opposite sides of substrate
Yuki Morikawa, Hyogo (JP); Masanori Sugimori, Hyogo (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. 16/637,034
Filed by Panasonic Intellectual Property Management Co., Ltd., Osaka (JP)
PCT Filed Nov. 2, 2018, PCT No. PCT/JP2018/040793
§ 371(c)(1), (2) Date Feb. 6, 2020,
PCT Pub. No. WO2019/107067, PCT Pub. Date Jun. 6, 2019.
Claims priority of application No. 2017-229192 (JP), filed on Nov. 29, 2017.
Prior Publication US 2020/0243827 A1, Jul. 30, 2020
This patent is subject to a terminal disclaimer.
Int. Cl. H01M 2/16 (2006.01); H01M 4/131 (2010.01); H01M 4/36 (2006.01); H01M 4/58 (2010.01); H01M 4/66 (2006.01); H01M 10/0525 (2010.01); H01M 50/417 (2021.01); H01M 50/423 (2021.01); H01M 50/451 (2021.01); H01M 50/457 (2021.01); H01M 50/46 (2021.01); H01M 4/02 (2006.01)
CPC H01M 50/46 (2021.01) [H01M 4/131 (2013.01); H01M 4/366 (2013.01); H01M 4/58 (2013.01); H01M 4/668 (2013.01); H01M 10/0525 (2013.01); H01M 50/417 (2021.01); H01M 50/423 (2021.01); H01M 50/451 (2021.01); H01M 50/457 (2021.01); H01M 2004/021 (2013.01); H01M 2004/028 (2013.01)] 3 Claims
OG exemplary drawing
 
1. A nonaqueous electrolyte secondary battery comprising a positive electrode, a negative electrode and a separator, wherein
the separator comprises a substrate, a first filler layer disposed on one side of the substrate and containing phosphate salt particles, and a second filler layer disposed on the other side of the substrate and containing inorganic particles with a higher melting point than the phosphate salt particles, the separator being disposed between the positive electrode and the negative electrode in such a manner that the first filler layer is directed to the positive electrode side, and
the BET specific surface area of the phosphate salt particles is not less than 5 m2/g and not more than 100 m2/g,
wherein the average particle size of the phosphate salt particles is 0.05 μm to 1 μm and is smaller than the average pore size of the substrate,
wherein the separator further comprises a resin layer containing a polyolefin, said resin layer being disposed on the surface of the first filler layer and in contact with the positive electrode,
wherein the first filler layer comprises a continuous layer configured to cover an entirety of a surface of the substrate on which the first filler layer is disposed,
wherein the phosphate salt particles contained in the first filler layer are configured to undergo melting and polycondensation by heat and a potential of the positive electrode, so as to fill pores in the substrate upon generation of a heat, and
wherein a porosity of the first filler layer is 30% or more and 70% or less.