Method for extracting lithium in waste lithium ion phosphate anode material

A technology of waste lithium iron phosphate and cathode material, which is applied in the direction of waste collector recycling, recycling technology, electrochemical generator, etc., can solve the problems of slow leaching speed, high recovery cost, poor leaching selectivity, etc. The effect of high energy utilization and heating efficiency

Inactive Publication Date: 2018-08-28
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method can realize the simultaneous recovery of iron resources and lithium resources, it needs to consume a large amount of sulfate during the roasting process, and the cost is relatively high.
[0004] The existing technology has problems such as high recycling cost of lithium iron phosphate cathode material, long treatment process, poor leaching selectivity, and slow leaching speed. Therefore, it is necessary to find a waste lithium iron phosphate cathode material with low recycling cost, high recovery rate, and fast entry and exit speed. The recycling method is of great significance

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  • Method for extracting lithium in waste lithium ion phosphate anode material

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Embodiment 1

[0043] This embodiment provides a method for leaching lithium in waste lithium iron phosphate cathode material, the specific method is:

[0044] The raw material used in this example is waste lithium iron phosphate positive electrode production waste, which contains 3.7wt% of Li, 32.49wt% of Fe, 16.4wt% of P and 1.2wt% of Al in terms of weight percentage after mechanical crushing and pretreatment.

[0045] (1) Add the pretreated lithium iron phosphate positive electrode powder to the mixed solution of sulfuric acid and hydrogen peroxide for slurry adjustment (mix evenly) to obtain a mixed slurry, wherein the molar ratio of H / Li is 2, and the dosage of oxidant hydrogen peroxide is The molar ratio of the oxidant / Li is 3.0, and in the leaching reaction, the liquid-solid ratio of the volume of the leaching agent solution to the mass of the spent lithium iron phosphate positive electrode material is 1:1;

[0046] (2) Place the mixed slurry obtained after pulping in a microwave reac...

Embodiment 2

[0050] This embodiment provides a method for leaching lithium in waste lithium iron phosphate cathode material, the specific method is:

[0051] The raw material used in this example is waste lithium iron phosphate battery, and its main components are calculated by weight percentage after mechanical crushing and pretreatment, including Li 2.19%, Fe 26.51%, P 12.4%, Al 1.2%, Fe 2.10% and Cu 1.09%. .

[0052] (1) Add the pretreated lithium iron phosphate positive electrode powder into a mixed solution of acetic acid and sodium persulfate for slurry mixing (uniformly mixed) to obtain a mixed slurry, wherein the molar ratio of H / Li is 1.80, and the oxidizing agent is over The dosage of sodium sulfate is that the mol ratio of oxidant / Li is 1.0, and in the leaching reaction, the liquid-solid ratio of the volume of the leaching agent solution and the quality of the waste lithium iron phosphate cathode material is 10:1;

[0053] (2) Put the mixed slurry obtained after pulping in a mi...

Embodiment 3

[0056] This embodiment provides a method for leaching lithium in waste lithium iron phosphate cathode material, the specific method is:

[0057] The raw material used in this example is waste lithium iron phosphate battery, and its main components are calculated by weight percentage after mechanical crushing and pretreatment, including Li 2.19%, Fe 26.51%, P 12.4%, Al 1.2%, Fe 2.10% and Cu 1.09%. .

[0058] (1) Add the pretreated lithium iron phosphate positive electrode powder to the mixed solution of oxalic acid and hydrogen peroxide for slurry adjustment (mix evenly) to obtain a mixed slurry, wherein the molar ratio of H / Li is 1.0, and the dosage of oxidant hydrogen peroxide is The molar ratio of the oxidant / Li is 3.0, and in the leaching reaction, the liquid-solid ratio of the volume of the leaching agent solution to the mass of the spent lithium iron phosphate positive electrode material is 50:1;

[0059] (2) Put the mixed slurry obtained after pulping in a microwave rea...

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Abstract

The invention provides a method for extracting lithium in a waste lithium ion phosphate anode material. The method comprises the following steps: (1) mixing the waste lithium ion phosphate anode material with an extracting agent solution to obtain mixed slurry; (2) extracting the mixed slurry in the step (1) under the microwave condition and performing solid-liquid separation after extracting to obtain solid containing lithium leachate and FePO4. According to the method disclosed by the invention, the lithium in the waste extracting agent anode material is extracted out through microwave assistance, so that an energy utilization rate and a heating efficiency are high; by means of the method, a lithium extracting rate can reach 95% or more, selectivity and a recovery rate of lithium can respectively reach 98% and 95% or more, and iron is precipitated in a FePO4 mode; the method has the advantages of short process flow, simpleness in operation and easiness in industrial production.

Description

technical field [0001] The invention belongs to the field of secondary resource recovery, and relates to a method for leaching lithium from waste lithium iron phosphate cathode materials. Background technique [0002] Lithium-ion batteries are green batteries with a series of excellent properties, and have been widely used since their inception. LiFePO with olivine structure 4 The material has the characteristics of high energy density, low cost, and good chemical stability, and has attracted extensive attention, especially its low electrochemical potential makes LiFePO 4 It is considered as a safe cathode material. Therefore, in recent years, LiFePO 4 Lithium-ion batteries as cathode materials are widely used in the fields of electric tools, energy storage equipment, electric vehicles and hybrid vehicles. However, with LiFePO 4 With the wide application of lithium-ion batteries as positive electrode materials, the output of batteries is growing rapidly, and there will ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/54H01M10/0525
CPCH01M10/0525H01M10/54Y02E60/10Y02W30/84
Inventor 孙峙郑晓洪杨勇霞曹宏斌
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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