▎ 摘　　要

NOVELTY - Low-temperature and fast preparation of oligomeric graphene with large interlayer distance, comprises (i) preparing the graphene oxide (GO) dispersion by Hummers method as precursor, drying until the moisture content is 20-45% to obtain GO powder, and (ii) placing the GO powder in a tubular furnace, and heating to a certain temperature under the protection atmosphere to generate micro-explosion peeling. USE - The oligomeric graphene is useful in cathode material for potassium ion battery (claimed). ADVANTAGE - The method has excellent potassium storage performance, high structural stability, and buffering of volume expansion during electrochemical reactions. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: Preparing highly reduced oligomeric graphene with large interlayer distance; and Cathode electrode material for a potassium ion battery.