Method for preparing cathode material-lithium iron phosphate of lithium ion battery by utilizing steel slag
A technology for lithium-ion batteries and cathode materials, which is applied to battery electrodes, circuits, electrical components, etc., to achieve the effects of quality assurance, uniform mixing, and obvious advantages
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Embodiment 1
[0037] Embodiment one : Using steel slag to prepare lithium-ion battery cathode material LiFePO 4 method, including the following steps:
[0038] (1) Weigh 80 Kg of steel slag, crush it into a powder with a particle size of less than 100 mesh; weigh 4 Kg of glucose, add 10 Kg of water, stir and dissolve to obtain an aqueous glucose solution; add the aqueous glucose solution to the steel slag powder, put it into a mixer and stir evenly , to obtain the mixture; wherein the chemical composition of steel slag is shown in Table 1, the same below;
[0039] Table 1: Chemical composition of steel slag (mass fraction%)
[0040] Element CaO FeO Al 2 o 3 SiO 2 MgO MnO P 2 o 5 content 30-60 15-26 3-8 8-23 4-9 5-10 0.5-2
[0041] (2) Put the prepared mixture into a silicon carbide crucible, then put it into an industrial microwave oven, use microwaves to raise the temperature to 550°C at a rate of 10°C per minute, and keep it at this tempera...
Embodiment 2
[0046] Embodiment two : Using steel slag to prepare lithium-ion battery cathode material LiFePO 4 method, including the following steps:
[0047] (1) Weigh 80 Kg of steel slag, crush it into a powder with a particle size of less than 100 mesh; weigh 3 Kg of citric acid, add 8 Kg of water, stir and dissolve to obtain a citric acid aqueous solution; add the citric acid aqueous solution to the steel slag powder, and stir evenly to obtain Mixture;
[0048] (2) Put the prepared mixture into an alumina crucible, put it into an industrial microwave oven, and use microwaves to raise the temperature to 600°C at a rate of 8°C per minute, and keep it at this temperature for 12 minutes; Magnetic separation in a magnetic separation tube of / m to select 30Kg of steel slag extract;
[0049] (3) Add 100Kg of 30wt% dilute sulfuric acid solution to the steel slag extract, stir and react at 80°C for 4h; let it stand for 1h, then suction filter and wash to obtain the filtrate, add 6Kg hydrog...
Embodiment 3
[0053] Embodiment three : Using steel slag to prepare lithium-ion battery cathode material LiFePO 4 method, including the following steps:
[0054] (1) Weigh 90 Kg of steel slag, crush it into a powder with a particle size of less than 100 mesh; weigh 4 Kg of oxalic acid, add 10 Kg of water, stir and dissolve to obtain an aqueous oxalic acid solution; add the aqueous oxalic acid solution to the steel slag powder, and stir evenly to obtain a mixture;
[0055] (2) Put the prepared mixture into an alumina crucible, put it into an industrial microwave oven, use microwaves to raise the temperature to 600°C at a rate of 10°C per minute, and keep it at this temperature for 15 minutes; Magnetic separation in a magnetic separation tube with a strength of 55KA / m to select 40Kg of steel slag extract;
[0056] (3) Add 120Kg of 30wt% dilute sulfuric acid solution to the steel slag extract, stir and react at 80°C for 4h; let it stand for 1h, then suction filter and wash to obtain the fi...
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