Preparation method of LiFePO4/graphene composite material

• Main Authors: ZHU HUALI, ZHANG ZENG, CHEN ZHAOYONG
• Format: Patent
• Language: Chinese; English
• Published: 15.02.2017
• Subjects: BASIC ELECTRIC ELEMENTS; CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATERTREATMENT OR WASTE MANAGEMENT; ELECTRICITY; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE

The invention discloses a preparation method of a LiFePO4/graphene composite material. The method mainly comprises the following steps: mixing a LiFePO4 material with graphene; and taking N-methyl-2-pyrrolidone as a dispersing agent, and ball-milling to obtain the final product. Waste LiFePO4 battery cathode plates are soaked in an organic solvent, is ultrasonically treated, ball-milled, roasted and quenched, and is mixed with conductive carbon black and roasted to obtain the LiFePO4 material; and carrying out reduction reaction on magnesium powder and carbon tetrachloride to obtain the graphene. The method is simple, the cost is low, and the conductivity of the obtained composite material is excellent. 本发明公开了种LiFePO/石墨烯复合材料的制备方法。该方法主要包括将LiFePO材料和石墨烯混合，以N-甲基-2-吡咯烷酮为分散剂，球磨得到。其中，将废旧LiFePO电池正极片通过有机溶剂浸泡、超声波处理、球磨、焙烧、淬火、与导电炭黑混合焙烧得到LiFePO材料；将镁粉与四氯化碳发生还原反应得到石墨烯。采用本发明的方法，方法简单，成本低，得到的复合材料导电性能优良。