Abstract: A polyimide binder from which a high-capacity power storage device, which has a small irreversible capacity and a high initial charge/discharge efficiency and is lightweight, can be obtained. The polyimide binder precursor composition is a polyimide binder precursor composition for a power storage device electrode, and includes a reaction product of a tetracarboxylic acid component and a diamine component, and a solvent. The polyimide binder obtained from the polyimide binder precursor composition has an irreversible capacity of 1200 mAh/g or less.

Abstract: A polyimide precursor for producing a flexible electronic device substrate that provides a polyimide with reduced charge-up, particularly a polyimide in the form of a film. When a polyimide film having a thickness of 10 ?m is formed using the polyimide precursor, and a pair of electrodes is formed with a distance d on the polyimide film, and when the polyimide film is irradiated with a laser beam while applying a DC voltage with an electric field strength of 0.1 to 10 V/?m between the pair of electrodes; two SHG lights are observed between the pair of electrodes and satisfy a symmetry ratio of 0.5 or more. The symmetry ratio (LR ratio)=Ismall/Ilarge, wherein, Ilarge represents the peak intensity of the SHG light with the larger intensity, and Ismall represents the peak intensity of the SHG light with the smaller intensity.

Abstract: A polyimide precursor for a display substrate capable of forming a polyimide film for a display substrate having a charge half-life of 48 seconds or more and/or a charge decay ratio after 120 seconds of 63% or less in measurement of the charge half-life in accordance with JIS L 1094A.

Abstract: A polyimide precursor for a display substrate capable of forming a polyimide film for a display substrate having a charge half-life of 48 seconds or more and/or a charge decay ratio after 120 seconds of 63% or less in measurement of the charge half-life in accordance with JIS L 1094A.

Abstract: A polyimide binder from which a high-capacity power storage device, which has a small irreversible capacity and a high initial charge/discharge efficiency and is lightweight, can be obtained. The polyimide binder precursor composition is a polyimide binder precursor composition for a power storage device electrode, and includes a reaction product of a tetracarboxylic acid component and a diamine component, and a solvent. The polyimide binder obtained from the polyimide binder precursor composition has an irreversible capacity of 1200 mAh/g or less.