Preparation method of lithium ion battery positive pole material LiFePO4/C
A technology for lithium ion batteries and cathode materials, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as crystallinity, morphology and particle size that cannot be balanced, and achieve excellent electrochemical performance, low reaction temperature, and reaction. short time effect
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[0043] Example 1
[0044] Weigh FeSO in a molar ratio of 1:1:1 4 ·5H 2 O, H 3 PO 4 and LiOH·H 2 O. FeSO 4 ·5H 2 O and H 3 PO 4 Dissolved in ionized water, under the condition that argon gas was continuously introduced into the above solution, LiOH was added to the above solution to obtain a reaction precursor (the concentration of lithium ions was 2 mol L -1 ), at this time, the pH of the reaction system was 5.0. Under the condition that argon gas is continuously passed into the reaction precursor, it is transferred into the hydrothermal reaction kettle, and argon gas is passed into the kettle to remove the air in the kettle. The reaction kettle was placed in a blast drying oven, reacted at 190° C. for 6 h and taken out from the blast drying oven, and cooled to 40° C. After the kettle was cooled, the reaction product was taken out and washed three times with deionized water. Finally, the LiFePO was obtained by drying under vacuum at 50 °C for 12 h. 4 powder. A ce...
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[0046] Example 2
[0047] Weigh FeCl in a molar ratio of 1:1:4 2 , NH 4 H 2 PO 4 and Li 2 SO 4 . FeCl 2 and NH 4 H 2 PO 4 Dissolved in deionized water, Li was added to the above solution under the condition that argon gas was continuously passed into the above solution 2 SO 4 Obtain the reaction precursor (the concentration of lithium ions is 9 mol L -1 ), at this time, the pH of the reaction system was 8.0. Under the condition that argon gas is continuously passed into the reaction precursor, it is transferred into the hydrothermal reaction kettle, and argon gas is passed into the kettle to remove the air in the kettle. The reaction kettle was placed in a blast drying oven, reacted at 190° C. for 6 h, taken out from the blast drying oven, and cooled to room temperature. After the kettle was cooled, the reaction product was taken out and washed three times with deionized water. Finally, vacuum drying at 120 °C for 1 h to obtain LiFePO 4 powder. A certain amoun...
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[0049] Example 3
[0050] Weigh Fe(NO) in a molar ratio of 1:1:3 3 ) 3 ·9H 2 O, H 3 PO 4 and CH 3 COOLi. First, Fe(NO 3 ) 3 ·9H 2 O and H 3 PO 4 Dissolve in deionized water, add CH to the above solution under the condition that nitrogen gas is continuously introduced into the above solution 3 COOLi obtains the reaction precursor (the concentration of lithium ions is 8 mol L -1 ), at this time, the pH of the reaction system was 7.0. Under the condition that nitrogen gas is continuously introduced into the reaction precursor, it is transferred into a hydrothermal reaction kettle, and argon gas is introduced into the kettle to remove the air in the kettle. The reaction kettle was placed in a blast drying oven, and after 10 hours of reaction at 100 °C, it was taken out from the blast drying oven and cooled to room temperature. After the kettle was cooled, the reaction product was taken out and washed three times with deionized water. Finally, vacuum drying at 60 °C ...
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