A kind of preparation method of coated lithium ferrous silicate composite material
A technology of lithium ferrous silicate and composite materials, applied in the direction of structural parts, electrical components, battery electrodes, etc., can solve the problems of short cycle life, safety problems, and poor cycle life of lithium manganate batteries, and achieve high initial discharge Reversible capacity, long service life, and enhanced activity
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Embodiment 1
[0022] Weigh lithium oxalate, ferrous acetate tetrahydrate, and ammonium metanickelate and dissolve them in deionized water to form a mixed solution. Add ethyl orthosilicate dropwise to the mixed solution of the above solution. The molar ratio of lithium, iron, silicon, and nickel is 2:1:0.85:0.15, and then ultrasonicated at a power of 120W for 2h. After mixing thoroughly, the temperature was raised to 80°C, stirred and refluxed for 24h, and the resulting mixed solution was The solvent was volatilized at 50° C. to obtain a wet sol, and the obtained wet sol was vacuum-dried at 100° C. for 20 h to obtain a dry sol. The obtained dry gel precursor was heated to 400°C at a rate of 2°C / min for 8 hours in a helium atmosphere, cooled naturally to room temperature, taken out and fully ground, and then heated to a constant temperature of 700°C at a rate of 10°C / min After calcining for 18 hours, the lithium ferrous silicate composite material is obtained after naturally cooling down to r...
Embodiment 2
[0028] Weigh lithium oxalate, ferrous acetate tetrahydrate, and ammonium metanickelate and dissolve them in deionized water to form a mixed solution. Add ethyl orthosilicate dropwise to the mixed solution of the above solution. The molar ratio of lithium, iron, silicon, and nickel is 2:1:0.95:0.05, and then ultrasonically for 1-2h under the power of 120-150W, after mixing thoroughly, the temperature is raised to 80-100°C, stirred and refluxed for 12- After 24 hours, the obtained mixed solution was volatilized at 50-70° C. to obtain a wet sol, and the obtained wet sol was vacuum-dried at 100-120° C. for 12-20 hours to obtain a dry sol. Heat the obtained xerogel precursor to 400-450°C at a rate of 2-5°C / min for 5-8 hours in a helium atmosphere, cool it down to room temperature naturally, take it out and grind it thoroughly, and then heat it at 10-15°C / min Heating at a rate of 1 min to 700-800 °C for 15-18 hours at a constant temperature, and then naturally cooling down to room t...
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