BINDER AQUEOUS SOLUTION FOR LITHIUM ION BATTERY ELECTRODE, SLURRY FOR LITHIUM ION BATTERY NEGATIVE ELECTRODE, NEGATIVE ELECTRODE FOR LITHIUM ION BATTERY, AND LITHIUM ION BATTERY

To provide a binder aqueous solution for a lithium ion battery electrode, a slurry for a lithium ion battery negative electrode, a negative electrode for a lithium ion battery, and a lithium ion battery.SOLUTION: A binder aqueous solution for a lithium ion battery is provided according to a disclosure hereof. The binder aqueous solution comprises: an acidic group-containing water-soluble polymer (A), which is a polymer of a group of monomers including 30 to 90 mol% of a (meth)acryl amide group-containing compound (a), 3 to 20 mol% of an unsaturated organic acid (b), and 5 to 40 mol% of alkali metal or alkali earth metal salt (c) of unsaturated organic acid to 100 mol% of a group of monomers; and an amino group-containing water-soluble polymer (B) of which the 1-mass% aqueous solution is pH9 or higher.SELECTED DRAWING: None 【課題】リチウムイオン電池電極用バインダー水溶液、リチウムイオン電池負極用スラリー、リチウムイオン電池用負極及びリチウムイオン電池を提供すること。【解決手段】本開示は、単量体群１００モル％に対して、（メタ）アクリルアミド基含有化合物（ａ）を３０〜９０モル％、不飽和有機酸（ｂ）を３〜２０モル％、及び不飽和有機酸のアルカリ金属又はアルカリ土類金属塩（ｃ）を５〜４０モル％含む単量体群の重合物である酸性基含有水溶性ポリマー（Ａ）、並びに１質量％水溶液のｐＨが９以上であるアミノ基含有水溶性ポリマー（Ｂ）を含む、リチウムイオン電池用バインダー水溶液を提供する。【選択図】なし