Spherical graphene/FePO4 composite and preparing method thereof
A spherical graphite and composite material technology, applied in the field of lithium ion batteries, can solve the problems of limited improvement of material properties, inability to guarantee the integrity of graphene coating, etc., and achieves simple preparation process, improved high rate performance, and convenient preparation process operation. Effect
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Embodiment 1
[0025] Get 3g graphene and ultrasonically disperse evenly in the reactor, weigh the Fe(NO 3 ) 3 9H 2 O and H 3 PO 4 Prepare a 0.2mol / L mixed acid solution and continuously input it into the above reaction kettle, control the reaction temperature at 60°C, adjust the pH of the solution to 2 with 0.5mol / L dilute ammonia water, control the stirring intensity at 200r / s, and obtain a yellow color after 5 hours of reaction Emulsion i.e. primary grown graphene / FePO 4 2H 2 O, the concentrated primary grown graphene / FePO 4 2H 2 O is uniformly dispersed in the reaction kettle, and the above-mentioned mixed acid solution and lye containing iron salt and phosphorus compound are flowed into the above-mentioned reaction kettle and adjusted to pH = 2, and the precipitate is filtered and washed after stirring for 5 hours. and dried to obtain secondary grown spherical graphene / FePO 4 2H 2 O. The precursor powder was heat-treated at 500 °C for 10 h under an inert atmosphere to obtain s...
Embodiment 2
[0028] Take 3g of graphene and ultrasonically disperse it uniformly in the reactor, and weigh the equimolar FeSO 4 with H 3 PO 4 Prepare a 0.4mol / L mixed acid solution and continuously input it into the above reaction kettle, control the reaction temperature at 60°C, adjust the pH of the solution to 3 with 1.0mol / L dilute ammonia water, control the stirring intensity at 200r / s, and obtain a yellow color after 5 hours of reaction Emulsion i.e. primary grown graphene / FePO 4 2H 2 O, the concentrated primary grown graphene / FePO 4 2H 2 O is uniformly dispersed in the reaction kettle, and the above-mentioned mixed acid solution and lye containing iron salt and phosphorus-containing compound are flowed into the above-mentioned reaction kettle and adjusted to pH=3, and after stirring and reacting for 5 hours, the precipitate is suction filtered, Secondarily grown spherical graphene / FePO after washing and drying 4 2H 2 O. The precursor powder was heat-treated at 500 °C for 10 h...
Embodiment 3
[0031] Get 5g of graphene ultrasonic vibration and evenly disperse in the reactor, weigh the Fe(NO 3 ) 3 9H 2 O and H 3 PO 4 Prepare a 0.4mol / L mixed acid solution and continuously input it into the above reaction kettle, control the reaction temperature at 60°C, adjust the pH of the solution to 2 with 1.0mol / L dilute ammonia water, control the stirring intensity at 200r / s, and obtain a yellow color after 5 hours of reaction Emulsion i.e. primary grown graphene / FePO 4 2H 2 O, the concentrated primary grown graphene / FePO 4 2H 2 O is uniformly dispersed in the reaction kettle, and the above-mentioned mixed acid solution and lye containing iron salt and phosphorus compound are flowed into the above-mentioned reaction kettle and adjusted to pH=2, and the precipitate is filtered by suction after stirring for 5 hours. Secondarily grown spherical graphene / FePO after washing and drying 4 2H 2 O. The precursor powder was heat-treated at 600 °C for 10 h under an inert atmosphe...
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