POLYIMIDE BINDER FOR POWER STORAGE DEVICE, ELECTRODE SHEET USING SAME, AND POWER STORAGE DEVICE
申请人:UBE Industries, Ltd.
公开号:EP3051613A1
公开(公告)日:2016-08-03
Provided are a polyimide binder for energy storage device capable of improving properties of an energy storage device in a broad temperature range, and an electrode sheet and an energy storage device using the same. The polyimide binder for energy storage device, which is a polyimide obtained by subjecting an aqueous solution of a polyamic acid composed of a repeating unit represented by the following general formula (I) to an imidization reaction, the polyimide having a tensile elastic modulus of 1.5 GPa or more and 2.7 GPa or less.
In the formula, A is a tetravalent group resulting from eliminating a carboxyl group from a specified tetracarboxylic acid, and B is a divalent group resulting from eliminating an amino group from a specified diamine, provided that 55 mol% or more of B in a total amount of the repeating unit is the divalent group resulting from eliminating an amino group from an aliphatic diamine having a molecular weight of 500 or less.
本发明提供了一种用于储能装置的聚酰亚胺粘结剂,该粘结剂能够改善储能装置在宽温度范围内的性能,还提供了使用该粘结剂的电极片和储能装置。这种用于储能装置的聚酰亚胺粘结剂,是通过将由以下通式(I)所代表的重复单元组成的聚酰胺的水溶液进行亚胺化反应而得到的聚酰亚胺,该聚酰亚胺的拉伸弹性模量为 1.5 GPa 或以上、2.7 GPa 或以下。
式中,A 是通过消除特定四羧酸中的一个羧基而产生的四价基团,B 是通过消除特定二胺中的一个氨基而产生的二价基团,条件是 B 在重复单元总量中所占的 55 摩尔%或以上是通过消除分子量为 500 或以下的脂肪族二胺中的一个氨基而产生的二价基团。