Method for preparing lithium iron phosphate positive electrode material by molten salt method
A technology of lithium ferrous phosphate and positive electrode material is applied in the field of preparation of lithium ferrous phosphate positive electrode material and the preparation of lithium ferrous phosphate positive electrode material by molten salt method, which can solve the problems of high reaction time and reaction temperature, uneven heating, etc. The effect of low production cost, good consistency and product consistency guarantee
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Embodiment 1
[0070] This embodiment provides a method for preparing a lithium iron phosphate cathode material by a molten salt method, the method comprising the following steps:
[0071] (1) 96g of lithium hydroxide, 320g of ferric oxide and 544g of potassium dihydrogen phosphate (the molar ratio of Li, Fe and P is 1:1:1) were mixed to obtain mixture A;
[0072] (2) Mix 80g glucose, 100g lithium fluoride and 1000g potassium chloride to obtain mixture B;
[0073] (3) Mix the mixture A obtained in step (1) with the mixture B obtained in step (2), put it into a ball mill tank for grinding for 5 hours, press it into a cake shape with a cake press machine, and under the protection of nitrogen, the cake-shaped grinding material Place it in a vertical sintering furnace and calcinate for 7 hours at a temperature of 850 ° C. After the reaction is completed, cool to room temperature with the furnace temperature to obtain a block;
[0074] (4) The blocky object described in step (3) is ground into p...
Embodiment 2
[0076] (1) Mix 139g lithium acetate, 300g ferrous oxalate and 240g ammonium dihydrogen phosphate (the molar ratio of Li, Fe and P is 1.01:1:1) to obtain mixture A;
[0077] (2) 111g of sucrose, 400g of lithium chloride and 600g of potassium chloride were mixed to obtain mixture B;
[0078] (3) Mix the mixture A obtained in step (1) with the mixture B obtained in step (2), put it into a ball mill tank for grinding for 8 hours, press it into a cake shape with a cake press machine, and under the protection of nitrogen, the cake-shaped grinding material Place it in a vertical sintering furnace and calcinate for 8 hours at a temperature of 650 ° C. After the reaction is completed, cool to room temperature with the furnace temperature to obtain a block;
[0079] (4) The blocky object described in step (3) is ground into a powder in a ball mill, washed with water three times, filtered and dried at 200° C. for 2 hours with a blower to obtain a lithium iron phosphate cathode material. ...
Embodiment 3
[0081] This embodiment provides a method for preparing a lithium iron phosphate cathode material by a molten salt method, the method comprising the following steps:
[0082] (1) 113g lithium carbonate and 453g anhydrous ferric phosphate (the molar ratio of Li, Fe and P are 1.02:1:1) are mixed, obtain mixture A;
[0083] (2) Mix the composition of 100g polyethylene glycol, 800g equimolar sodium chloride and potassium chloride, obtain mixture B;
[0084] (3) Mix the mixture A obtained in step (1) with the mixture B obtained in step (2), put it into a ball mill tank for grinding for 7 hours, press it into a cake shape with a cake press machine, and under the protection of nitrogen, the cake-shaped grinding material Place it in a vertical sintering furnace and calcinate for 6 hours at a temperature of 750°C. After the reaction is completed, cool to room temperature with the furnace temperature to obtain a block;
[0085] (4) The blocky object described in step (3) is ground into ...
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Abstract
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