| abstract |
The invention relates to a preparation method of a fluoride modified lithium cobaltate positive electrode material, which comprises the following steps: (1) mixing cobalt oxyhydroxide and lithium in a certain ratio by a jar mill, roasting at 1000 ℃, and carrying out post-treatment on the roasted material to obtain small-particle single crystal lithium cobaltate; (2) mixing AlCl 3 ·6H 2 O, LiCl and NH 4 And F is completely dissolved in deionized water, then 15g of lithium cobaltate is slowly added into the solution, the solution is heated and stirred, the mixed solution is poured into a PTFE high-pressure hydrothermal reaction kettle, and drying treatment is carried out in a forced air drying oven to obtain the matrix material. (3) And sintering the base material, and treating the sintered material to obtain the fluoride modified lithium cobaltate cathode material. The preparation method has the advantages that firstly, the lithium fluoride and the aluminum fluoride obtain double-coating effect; second, lithium cobaltate surface coatingThe Co-cladding modification can effectively promote the formation of Co-Al-O-F substances, and the substances can effectively inhibit the side reaction of electrolyte and reduce the surface impedance accumulation of materials under high voltage. |