Preparation method of potassium ion battery negative electrode composite material and obtained material

• Main Authors: HU RONGXIANG, WEI YICHENG, ZHANG YUAN, PAN LONG, SHA DAWEI
• Format: Patent
• Language: Chinese; English
• Published: 30.05.2023
• Subjects: BASIC ELECTRIC ELEMENTS; CHEMISTRY; COMPOUNDS THEREOF; ELECTRICITY; INORGANIC CHEMISTRY; METALLURGY; NON-METALLIC ELEMENTS; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

The invention discloses a potassium ion battery negative electrode composite material preparation method, which comprises: adding indium nitrate hydrate and terephthalic acid into an N, N-dimethylformamide solution to dissolve, adding a sodium acetate solution, carrying out a heating reaction, collecting the mixed liquid, carrying out centrifugal washing, taking the washed precipitate, and drying to obtain In-MOF; in-MOF is vulcanized into an In2S3/C material by using thioacetamide at the temperature of 400-450 DEG C in an argon atmosphere, and the mass ratio of thioacetamide to In-MOF is (4-5): 1; the method comprises the following steps: performing nitrogen doping on an In2S3/C material by using urea, and reacting at 300-600 DEG C in an argon atmosphere; according to the N-In2S3/C potassium ion battery negative electrode composite material disclosed by the invention, N replaces S and is doped on In2S3, so that defects and active sites are increased, the polarity and conductivity of chemical bonds are enhanc