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Method for preparing lithium ion battery anode material lithium iron phosphate

A lithium-ion battery and lithium iron phosphate technology, applied in battery electrodes, chemical instruments and methods, circuits, etc., can solve problems such as difficult product ratio stability, complex multi-component precipitation conditions, etc., achieve good electrochemical performance and improve electrical conductivity Performance and energy reduction effect

Inactive Publication Date: 2009-01-28
KINGRAY NEW MATERIALS SCI & TECH
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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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Effect test

Embodiment 1

[0024] Embodiment 1 Get 10mol ferrous sulfate, react with 1285g sodium carbonate, obtain ferrous carbonate intermediate, after washing and filtering for many times, directly beat into pulp, be equipped with the phosphoric acid of 428.43g lithium hydroxide, 1176g85% and 487g glucose, process The solid content of the final slurry is about 300g / L, and the powder material is obtained after drying. The first roasting system is: the temperature is raised to 400°C at a constant temperature of 5hrs at a rate of 8°C / min, and then cooled with the furnace; the material is processed once. Carry out second roasting again again. 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 1.35g / cm 3 ; The product was made into a 2016 button battery test, 0.1C charge and disch...

Embodiment 2

[0025] Embodiment 2 gets 8mol ferrous sulfate, reacts with 1200g sodium carbonate, obtains ferrous carbonate intermediate, directly beats into pulp after repeated washing and filtration, is equipped with 312.12g lithium carbonate, 1164.5g85% phosphoric acid and 389.6g glucose, process The solid content of the final slurry is about 350g / L, and the powder material is obtained after drying. The first roasting system is: the temperature is raised to 450°C at a constant temperature of 3hrs at a rate of 6°C / min, and then cooled with the furnace; the material is processed once. Carry out second roasting again again. The second roasting system is as follows: the temperature is raised to 600°C at a constant temperature of 20hrs at a heating 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 1.39g / cm 3 ; The product was made into a 2016 button battery test, 0.1...

Embodiment 3

[0026] Embodiment 3 gets 10mol ferrous chloride, reacts with 1499g sodium carbonate, obtains ferrous carbonate intermediate, after repeatedly washing and filtering, directly beats into a slurry, is equipped with phosphoric acid of 436.83g lithium hydroxide, 1176g85% and 158g sucrose, The solid content of the final slurry in the process is about 380g / L, and the powder material is obtained after drying. The first roasting system is: the temperature is raised to 600°C at a constant temperature of 2hrs at a rate of 3°C / min, and then cooled with the furnace; the material is treated once After the process, the second roasting is carried out. The second roasting system is as follows: the heating rate is raised to 750° C. for 10 hrs at a heating rate of 2° 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 1.45g / cm 3 ; The product was made into a 2016 button battery test, 0....

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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 a wet chemical method is adopted to synthesize ferrous carbonate by cheap and soluble bivalent iron salt and sodium carbonate; after cleaning, Li salt, a P source and a soluble C source are added and dried; and finally, after baked twice and ground once, dried powder is made into LiFePO4 with regular appearance, uniform grain size and excellent electrical property. The method has the advantages of simple technological process, low production cost of prepared product and stable and controllable product performance, and can be used in industrial production.

Description

technical field [0001] The present invention relates to a kind of preparation method of lithium-ion battery cathode material, especially the preparation method of lithium-ion battery cathode material LiFePO 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 rapidly promoted in shower power supplies for automo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
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 KINGRAY NEW MATERIALS SCI & TECH
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