A polyimide-coated active material particle (21) of the present invention includes an active material particle (23) and a polyimide layer (24) derived from a monomeric polyimide precursor and coated on the active material particle (23). A negative electrode (200) of the present invention includes a current collector (30) and an active material layer (20) including the negative electrode active material particle (21) coated with the polyimide layer (24) derived from a monomeric polyimide precursor, and an aqueous binder (22). With the polyimide-coated active material particle of the present invention, it is possible to suppress the amount of organic solvent used and improve the charge-discharge cycle of the electrode.
本发明的聚
酰亚胺涂层活性材料颗粒(21)包括活性材料颗粒(23)和由单体聚
酰亚胺前体衍生并涂覆在活性材料颗粒(23)上的聚
酰亚胺层(24)。本发明的负极(200)包括集流器(30)和活性材料层(20),活性材料层(20)包括涂有由单体聚
酰亚胺前体衍生的聚
酰亚胺层(24)的负极活性材料颗粒(21)和
水性粘合剂(22)。使用本发明的聚
酰亚胺涂层活性材料颗粒,可以减少有机溶剂的用量,改善电极的充放电循环。