US 11,870,076 B2
Binder for nonaqueous electrolyte secondary battery electrode
Naohiko Saito, Nagoya (JP); Takashi Hasegawa, Nagoya (JP); Atsushi Nishiwaki, Nagoya (JP); Hideo Matsuzaki, Nagoya (JP); Nobuhiro Sakitani, Osaka (JP); Sho Urata, Hyogo (JP); and Takaharu Morikawa, Osaka (JP)
Assigned to TOAGOSEI CO., LTD., Tokyo (JP); and PANASONIC ENERGY CO., LTD., Osaka (JP)
Appl. No. 16/499,593
Filed by TOAGOSEI CO., LTD., Tokyo (JP); and PANASONIC ENERGY CO., LTD., Moriguchi (JP)
PCT Filed Mar. 5, 2018, PCT No. PCT/JP2018/008258
§ 371(c)(1), (2) Date Sep. 30, 2019,
PCT Pub. No. WO2018/180231, PCT Pub. Date Oct. 4, 2018.
Claims priority of application No. 2017-063809 (JP), filed on Mar. 28, 2017.
Prior Publication US 2020/0044254 A1, Feb. 6, 2020
Int. Cl. H01M 4/62 (2006.01); H01M 10/0525 (2010.01); C08F 220/14 (2006.01); C08F 290/12 (2006.01); C08F 220/18 (2006.01); C08F 8/14 (2006.01)
CPC H01M 4/622 (2013.01) [C08F 8/14 (2013.01); C08F 220/14 (2013.01); C08F 220/1804 (2020.02); C08F 290/126 (2013.01); H01M 10/0525 (2013.01); Y02E 60/10 (2013.01)] 10 Claims
 
1. A binder for a non-aqueous electrolyte secondary battery electrode, comprising:
a crosslinked polymer having a carboxyl group or a salt thereof, wherein
the crosslinked polymer includes
a structural unit derived from an ethylenically unsaturated carboxylic acid monomer; and
a structural unit derived from a macromonomer having a linear structure of a straight chain and including at least one monomer selected from compounds represented by following formula (1):
[C1]
H2C═CR1−X  formula (1)
wherein in formula (1), R1 represents a methyl group; X represents C(═O)OR2; and R2 represents a straight chain or branched C1-C8 alkyl group or a C3-C8 alkyl group having an alicyclic structure,
wherein the macromonomer has 70 mass % or more of the monomer selected from compounds represented by the formula (1) and an ethylenically unsaturated group in the end or the intermediate segment of the molecular chain of the macromonomer and
wherein, the crosslinked polymer comprises 50% by mass or more and 99.5% by mass or less of the structural unit derived from the ethylenically unsaturated carboxylic acid monomer relative to the all structural units in the crosslinked polymer and 0.1% by mass or more and 50% by mass or less of the structural unit derived from the macromonomer relative to the all structural units in the crosslinked polymer.