BINDER FOR SECONDARY BATTERY, ELECTRODE MIXTURE FOR SECONDARY BATTERY, ELECTRODE FOR SECONDARY BATTERY AND SECONDARY BATTERY
申请人:Daikin Industries, Ltd.
公开号:EP3680969A1
公开(公告)日:2020-07-15
The invention provides a binder for a secondary battery leading to an excellently high density of an electrode, excellent adhesiveness to a current collector, excellent flexibility of an electrode, and excellent viscosity retention of slurry. The binder for a secondary battery contains a fluorine-containing polymer (A) and polyvinylidene fluoride (B). The fluorine-containing polymer (A) contains a polymerized unit based on vinylidene fluoride, a polymerized unit based on tetrafluoroethylene, and a polymerized unit based on a monomer (2-2) represented by the following formula (2-2):
wherein R5, R6, and R7 are each independently a hydrogen atom or a C1-C8 hydrocarbon group; R8 is a C1-C8 hydrocarbon group; and Y1 is an inorganic cation or an organic cation.
本发明提供了一种用于二次电池的粘合剂,可使电极具有极高的密度、与集流体具有极佳的粘合性、电极具有极佳的柔韧性以及浆料具有极佳的粘度保持性。二次电池粘合剂包含含氟聚合物(A)和聚偏氟乙烯(B)。含氟聚合物 (A) 包含以偏氟乙烯为基础的聚合单元、以四氟乙烯为基础的聚合单元和以下式 (2-2) 所代表的单体 (2-2) 为基础的聚合单元:
其中 R5、R6 和 R7 各自独立地为氢原子或 C1-C8 烃基;R8 为 C1-C8 烃基;Y1 为无机阳离子或有机阳离子。