POSITIVE ELECTRODE PRECURSOR

PROBLEM TO BE SOLVED: To provide a positive electrode precursor which is high in peel strength of a positive electrode active material layer, which allows a negative electrode to be pre-doped in a short time, and which enables the production of a nonaqueous hybrid capacitor having a high energy density and a high input/output.SOLUTION: A positive electrode precursor comprises: an alkali metal compound other than a positive electrode active material; a positive electrode current collector; and a positive electrode active material layer on one or each of opposing faces of the positive electrode current collector. The positive electrode active material layer comprises the positive electrode active material including a carbon material, and a binding agent. When a weight percentage of the alkali metal compound to a mass of the positive electrode precursor, excluding the positive electrode current collector is X mass%, 5≤X≤50. The binding agent contains a fluorine-containing substance. The binding agent has a weight-average molecular weight of 500,000 to 1800,000.SELECTED DRAWING: None 【課題】正極活物質層の剥離強度が高く、負極へのプレドープを短時間で行うことができ、高エネルギー密度かつ高入出力な非水系ハイブリッドキャパシタを製造することができる正極前駆体を提供することである。【解決手段】正極活物質以外のアルカリ金属化合物と、正極集電体と、上記正極集電体の片面又は両面に正極活物質層とを有し、上記正極活物質層は、炭素材料を含む正極活物質と、結着剤とを含有する、正極前駆体であって、上記正極集電体を除く上記正極前駆体の質量を基準として、上記アルカリ金属化合物の重量比をＸ質量％とするとき、５≦Ｘ≦５０であり、上記結着剤はフッ素含有物を含み、上記結着剤の重量平均分子量が５０万以上１８０万以下である、正極前駆体。【選択図】なし