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Method for preparing lithium ion battery anode material LiFePO4

A technology for lithium ion batteries and cathode materials, which is applied in battery electrodes, chemical instruments and methods, circuits, etc., can solve the problems of complex multi-precipitation conditions and difficult to stabilize product ratios, and achieve shortened process flow, good control, and improved electrical conductivity. performance effect

Active Publication Date: 2009-01-28
CHANGSHA RES INST OF MINING & METALLURGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such as LiOH into (NH 4 ) 2 Fe(SO 4 ) 2 .6H 2 O and H 3 PO 4 In the mixed solution, a coprecipitate was obtained, and after filtration and washing, heat treatment was carried out under an inert atmosphere to obtain LiFePO 4 [See Park K S, Son J T, Chung H T, et al.Synthesis ofLiFePO 4 by coprecipitation and microwave heating[J].Electrochemistry Communications, 2003, 5(10):839-842. and Arnold G, Garche J, Hemmer R, et al.Fine-particle lithium iron phosphate LiFePO 4 synthesize.d by a new low-cost aqueous precipitation technique[J].J PowerSources, 2003, 119-121: 247-251.], but the multivariate precipitation conditions are complicated, and the product ratio is difficult to stabilize

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Example 1 Take 10mol of iron powder, fully react with 1176g of 85% phosphoric acid and oxalic acid whose molar mass is 60% of the total amount of phosphoric acid, and the obtained slurry is directly equipped with 436.84g of lithium hydroxide, and the powder is obtained after drying, and is roasted for the first time The system is: increase the temperature at a rate of 8°C / min to 300°C for 6hrs, and then cool with the furnace. The roasted material is ground and then roasted for the second time. The second roasting system is as follows: the heating rate is raised to 650° C. for 15 hours at a heating rate of 5° C. / min, and the furnace is naturally cooled. The X-ray diffraction analysis of the obtained product shows that its phase is olivine structure; the tap density is 1.4g / cm 3 ;The product was made into a 2016 button battery test, 1C charge and discharge, and its initial discharge capacity was 140.1mAh / g; after 10 cycles, the capacity decayed by 0.0%.

Embodiment 2

[0027] Embodiment 2 Get 10mol iron powder, fully react with 1176g85% phosphoric acid and citric acid whose molar mass is 70% of the total amount of phosphoric acid, the obtained slurry is directly equipped with 397.7g lithium carbonate, after drying, powder material is obtained, and the first roasting The system is: raise the temperature to 350°C at a constant temperature of 5hrs at a rate of 8°C / min, and then cool down with the furnace. After roasting, the material is ground and then roasted for the second time. The second roasting system is: the temperature is raised to 650 °C at a constant temperature of 15 hrs at a rate of 5 °C / min, and then naturally cooled with the furnace. The X-ray diffraction analysis of the obtained product shows that its phase is olivine structure; the tap density is 1.41g / cm 3 ;The product was tested in 2016 as a button battery, charged and discharged at 1C, and its initial discharge capacity was 135mAh / g; after 10 cycles, the capacity decayed by 0...

Embodiment 3

[0028] Example 3 Take 4mol of iron powder and iron oxide powder containing 1mol of iron, and fully react with 588g of 85% phosphoric acid and oxalic acid whose molar mass is 40% of the total amount of phosphoric acid, and the obtained slurry is directly mixed with 390.2g of lithium carbonate, and dried to obtain For the powder material, the first roasting system is as follows: the temperature is raised to 400°C at a constant temperature of 4hrs at a rate of 6°C / min, and then cooled with the furnace. The roasted material is ground and then roasted for the second time. The second roasting system is as follows: the heating rate is raised to 750° C. for 10 hrs at a heating rate of 3° C. / min, and the furnace is naturally cooled. The X-ray diffraction analysis of the obtained product shows that its phase is olivine structure; the tap density is 139g / cm 3 ; The product was made into a 2016 button battery test, 1C charge and discharge, its initial discharge capacity is 137.2mAh / g: af...

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PUM

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Abstract

The invention relates to a method for preparing a LiFePO4 anode material for a lithium ion battery. The method comprises the following steps that iron powder or mixed iron powder and iron oxide powder are taken as an iron source which is reacted with phosphoric acid, organic acid and the like to obtain bivalent iron salt; and then, Li salt is added to obtain LiFePO4 with regular appearance, uniform grain size and excellent electrical property after twice baking. The method has the advantages of simple and easily controlled technological process, low production cost of prepared product, stable and controllable product performance, no release of the three wastes and environmental protection, and can be used in industrial production.

Description

technical field [0001] The invention relates to a preparation method of a positive electrode material of a lithium ion battery, in particular to preparing LiFePO, a positive electrode material of a lithium ion battery, by using iron powder acid dissolution 4 Methods. Background technique [0002] In 1997, A.K.Padi et al first reported the phosphate compound LiFePO with olivine structure 4 . Due to LiFePO 4 With the advantages of low price, environmental friendliness, and good cycle performance, it has attracted widespread attention, making it promising to replace LiCoO 2 , as the cathode material for the next generation of lithium-ion batteries. At present, lithium iron phosphate and its lithium-ion batteries have entered the stage of industrialization, and companies such as Valence and Phodrech in the United States and Sanyo and Sony in Japan are still vigorously developing LiFePO 4 The series of safe high-capacity lithium-ion batteries with positive poles have been ra...

Claims

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Application Information

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IPC IPC(8): H01M4/58C01B25/45
CPCY02E60/10
Inventor 湛中魁习小明周春仙李普良徐舜张瑾瑾
Owner CHANGSHA RES INST OF MINING & METALLURGY
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