▎ 摘　　要

NOVELTY - Electrochemical device comprises anode sheet, the anode sheet includes anode active material layer, the anode active material layer includes anode active material, the anode active material includes manganese-containing material, and ratio Y of the mass of the manganese-containing material to the mass of the anode active material is 0.4-1. USE - The electrochemical device is useful for electronic device. ADVANTAGE - The electrochemical device: can actively controls the dissolution of manganese in the anode of active material. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for electronic device.