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Method for recycling lithium iron phosphate anode material from lithium ionic cell waste

A technology of lithium ion battery and lithium iron phosphate is applied in the field of recycling lithium iron phosphate cathode material, which can solve the problems of low capacity of lithium ion secondary battery, and achieve the effect of cost saving and high capacity

Active Publication Date: 2009-02-04
贵州中伟资源循环产业发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the capacity of lithium-ion secondary batteries made of positive electrode materials recovered by this method is still low.

Method used

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  • Method for recycling lithium iron phosphate anode material from lithium ionic cell waste
  • Method for recycling lithium iron phosphate anode material from lithium ionic cell waste

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Take 10kg of lithium iron phosphate positive electrode waste slurry, put it into a material tray, put it into a high-temperature resistance furnace under a nitrogen atmosphere, bake it at a furnace temperature of 450°C for 5 hours, and then cool it with the furnace. Add the cooled material to the ferric nitrate ethanol solution whose concentration of ferric nitrate is 0.15mol / L and stir. Baking at 350° C. for 5 hours, and then cooling in the furnace to obtain the lithium iron phosphate cathode material.

[0024] The product is tested with a Japanese Rigaku D / MAX2200PC X-ray diffractometer, and the obtained diffraction pattern is as follows figure 1 As shown, as can be seen from this figure, the diffraction peak tested in the upper part is basically the same as the diffraction peak of the standard lithium iron phosphate in the lower part, and the main peak peak intensity is higher, and the half-peak width (B value is 0.178) is narrower, indicating that Its crystals are ...

Embodiment 2

[0026] Take 10kg of lithium iron phosphate waste slurry, put it into a material tray, put it into a high-temperature resistance furnace under a nitrogen atmosphere, bake it at a furnace temperature of 450°C for 5 hours, and then cool it with the furnace. Add the cooled material to the ferric nitrate ethanol solution whose concentration of ferric nitrate is 0.2mol / L and stir. After the ethanol volatilizes, put it into a tray and put it into a high-temperature resistance furnace under a nitrogen atmosphere. Bake at 350°C for 5h, then cool with the furnace.

[0027] Then 5kg of the obtained material is added to the ball milling tank, and 70.6g of lithium carbonate and 109.4g of ammonium dihydrogen phosphate are weighed respectively according to 3% of the molar number of 5kg lithium iron phosphate, and all are added to the ball milling tank, and then alcohol and pickaxe are added. Balls, after ball milling for 2 hours, take out the evenly mixed material and dry it at 60°C. Finall...

Embodiment 3

[0030] Take 10 kg of lithium iron phosphate cathode sheets scrapped in production, put them into a material tray, put them into a high-temperature resistance furnace under a nitrogen atmosphere, bake them at a furnace temperature of 550°C for 4 hours, and then cool with the furnace. Put the baked pole piece on a sieve with a mesh of 5mm, knead the pole piece, and shake the sieve from time to time to completely separate the material and the current collector. Add the obtained powder into the ferric nitrate ethanol solution whose concentration of ferric nitrate is 0.1mol / L and stir. Bake at 400°C for 4 hours, then cool with the furnace.

[0031]Then 5kg of the obtained material is added to the ball milling tank, and 26g of lithium hydroxide monohydrate, 84.3g of diammonium hydrogen phosphate and 7.6g of acetylene black are weighed respectively according to 2% of the molar number of 5kg lithium iron phosphate, and all are added to the ball milling tank Then add alcohol and pick ...

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Abstract

The invention relates to a method for recovering a lithium iron phosphate anode material in lithium ion battery scraps, comprising: roasting the scraps in the atmosphere of inert gases at a temperature of between 450 and 600 DEG C for 2 to 5 hours, wherein, the method also includes: adding the powdered products into an ethanol solution of soluble ferric salt for mixing, drying the mixture, then roasting the mixture in the atmosphere of inert gases at a temperature of between 300 and 500 DEG C for 2 to 5 hours, and obtaining the lithium iron phosphate anode material through recovery. The recovery method can be used to obtain the lithium iron phosphate anode material with rather high tap density, so the lithium ion secondary battery made by adopting the anode material has rather high capacity.

Description

technical field [0001] The invention relates to a recovery method of lithium iron phosphate cathode material in lithium ion battery waste. Background technique [0002] At present, lithium-ion secondary batteries with lithium iron phosphate as the positive electrode material have gradually entered the market due to their low cost and good safety performance, and have begun to be widely used in power batteries for notebook computers, power tools and electric vehicles. With the application of lithium-ion secondary batteries using lithium iron phosphate as the positive electrode material, the output of batteries is increasing rapidly, and a large amount of waste slurry and waste pole pieces will be produced in the process of preparing batteries. Therefore, in order to recycle and reuse materials, save costs and protect the environment, it is very necessary to recycle lithium iron phosphate in waste. [0003] CN1585180A discloses a method for recovering positive electrode resid...

Claims

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Application Information

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IPC IPC(8): H01M10/54
CPCY02W30/84
Inventor 龚振刚程堂利姜占锋
Owner 贵州中伟资源循环产业发展有限公司
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