Waste graphite negative electrode regeneration method

• Main Authors: XIONG JUN, FANG TING, ZHENG TIAN, LYU CHAORAN, HU WEN, LI SHOUDING, ZHAO YUZHEN
• Format: Patent
• Language: Chinese; English
• Published: 16.01.2024
• Subjects: BASIC ELECTRIC ELEMENTS; CRUSHING, PULVERISING, OR DISINTEGRATING; CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; ELECTRICITY; MILLING GRAIN; PERFORMING OPERATIONS; PREPARATORY TREATMENT OF GRAIN FOR MILLING; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY; TRANSPORTING

The invention relates to a waste graphite negative electrode regeneration method which comprises the following steps: S1, crushing a graphite negative electrode sheet to separate graphite from a copper foil to form a mixture, and sorting the mixture to obtain graphite negative electrode powder; s2, demagnetizing the graphite negative electrode powder to obtain pre-deironed graphite negative electrode powder; s3, mixing the pre-deironed graphite negative electrode powder with acid and an oxidizing agent, and performing stirring, filter pressing, water washing, drying and crushing to obtain purified graphite negative electrode powder; and S4, blending the purified graphite negative electrode powder and high-temperature asphalt by adopting a high-speed mixer, carrying out heat treatment to obtain surface modified graphite negative electrode powder, and demagnetizing to obtain the recycled graphite negative electrode. The method has the beneficial effects that metal impurities such as copper and iron in the graph