▎ 摘　　要

NOVELTY - The method involves coating a layer of suspension containing magnesite on a polyimide fiber paper. The layer of the suspension containing magnesite is dried to obtain a composite precursor. A current collector function is performed by a laser induced graphene (LIG) electrode according to a laser induction processing technology. An electrolyte is coated on a surface of the electrode to form a micro ultra capacitor. USE - Method for preparing flexible miniature ultra capacitor for use in lithium-ion battery, potassium ion battery and zinc ion battery. ADVANTAGE - The method enables simplifying the steps for preparing the capacitor with convenient operation, ensuring the usage of the laser induction processing technology environment-friendly, and reducing raw material utilization level. DESCRIPTION OF DRAWING(S) - The drawing shows a photographic view of a miniature ultra capacitor.