Method for microwave synthesis of lithium iron phosphate material

A lithium iron phosphate, microwave synthesis technology, applied in the field of electrochemistry, can solve the problems of long reaction time, serious environmental pollution, staying in the laboratory stage, etc., and achieve the effect of improving electrochemical performance, considerable economic benefits, and good environmental benefits

Inactive Publication Date: 2020-06-23
SHENZHEN INST OF ADVANCED TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The waste lithium battery recycling technology adopted by individual enterprises is relatively backward, with low efficiency and easy to produce secondary pollution. The recycling object is single, and the comprehensive utilization rate of battery residual value is low.
In the research on the recycling of waste lithium batteries, recycling technologies are still mostly in the laboratory stage, and there are problems of lagging behind in industrialization or poor practicability
[0004] At present, the recovery and regeneration p

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0023] Example 1: Microwave synthesis of lithium iron phosphate material using waste batteries

[0024] (1) Select the waste lithium iron phosphate battery, and disassemble it to obtain a positive electrode sheet after discharging treatment;

[0025] (2) putting the positive electrode sheet obtained in step (1) into a muffle furnace, calcining at 450° C. for 1 hour, taking out when the temperature drops to room temperature, mechanically vibrating the positive electrode sheet, so that the lithium iron phosphate falls off from the current collector aluminum foil to obtain black lithium iron phosphate powder;

[0026] (3) 30g of lithium iron phosphate powder, 3.3g of lithium carbonate, 3.3g of iron chloride, 3.3g of diammonium hydrogen phosphate, and 3.5g of sucrose are mixed, and the first ball milling is performed for 0.5 hours, and the rotating speed is 400 r / min. Then pass through a 200-mesh sieve; then put it into a microwave device, control the microwave power to be 750W, ...

Example Embodiment

[0027] Example 2 Microwave synthesis of lithium iron phosphate material using waste batteries

[0028] (1) Select the waste lithium iron phosphate battery, and disassemble it to obtain a positive electrode sheet after discharging treatment;

[0029] (2) putting the positive electrode sheet obtained in step (1) into a muffle furnace, calcining at 450° C. for 1 hour, taking out when the temperature drops to room temperature, mechanically vibrating the positive electrode sheet, so that the lithium iron phosphate falls off from the current collector aluminum foil to obtain black lithium iron phosphate powder;

[0030] (3) Mix 30g of lithium iron phosphate powder, 3.3g of lithium acetate, 3.3g of iron powder, 3.3g of lithium phosphate and 3.8g of sucrose, and perform the first ball milling for 0.5 hours at a rotational speed of 400 r / min, and then pass the ball milling for 200 Then put it into the microwave device, control the microwave power to be 750W, the continuous heating tim...

Example Embodiment

[0031] Example 3 Microwave synthesis of lithium iron phosphate material using waste batteries

[0032] (1) Select the waste lithium iron phosphate battery, and disassemble it to obtain a positive electrode sheet after discharging treatment;

[0033] (2) putting the positive electrode sheet obtained in step (1) into a muffle furnace, calcining at 450° C. for 1 hour, taking out when the temperature drops to room temperature, mechanically vibrating the positive electrode sheet, so that the lithium iron phosphate falls off from the current collector aluminum foil to obtain black lithium iron phosphate powder;

[0034] (3) Mix 30g of lithium iron phosphate powder, 1g of lithium acetate, 3.3g of iron powder, 3.3g of lithium phosphate and 3.8g of glucose, and then perform the first ball milling for 0.5 hours at a speed of 400 r / min, and then pass 200 meshes after ball milling. Then put it into the microwave device, control the microwave power to be 750W, the continuous heating time ...

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Abstract

The invention relates to a method for microwave synthesis of a lithium iron phosphate material, and particularly discloses a method for microwave synthesis of a lithium iron phosphate material by using a waste battery. The method specifically comprises the steps of (1) selecting a waste lithium iron phosphate battery, carrying out discharge treatment on the waste lithium iron phosphate battery, and disassembling to obtain a positive plate; (2) calcining the positive plate obtained in the step (1) at the temperature of 300-500 DEG C for 1-10 hours, taking out the positive plate after the temperature is reduced to room temperature, and mechanically vibrating the positive plate to enable lithium iron phosphate to fall off from a current collector aluminum foil to obtain lithium iron phosphatepowder; and (3) mixing the lithium iron phosphate powder, a lithium source, an iron source, a phosphorus source and a carbon source, performing ball milling, performing microwave treatment for 10-100seconds, and repeating the steps of ball milling and microwave treatment until lithium iron phosphate particles are obtained. The process is simple to operate, the process is easy to control, the energy consumption is low, the method is environmentally friendly, secondary pollutants are not generated, and meanwhile, the repaired lithium iron phosphate material can be reused for producing lithiumion batteries.

Description

technical field [0001] The invention relates to the field of electrochemistry, in particular to a method for synthesizing lithium iron phosphate by treating waste batteries by a microwave method. Background technique [0002] Since the commercialization of lithium-ion batteries, due to their high operating voltage, high energy density, long cycle life, easy portability, and good safety performance, they have been widely used in portable electronic devices such as mobile phones, notebook computers, cameras, and electric vehicles. Therefore, a large number of lithium-ion batteries will be produced every year, and a large number of scrapped batteries will be produced every year accordingly. [0003] Although some companies have begun to pay attention to the resource utilization of waste lithium batteries, my country has not yet established a national waste battery recycling and treatment system. The waste lithium battery recycling technology adopted by individual enterprises i...

Claims

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Application Information

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IPC IPC(8): H01M10/54H01M4/58C01B25/26C01B25/45C01B25/37
CPCC01B25/26C01B25/375C01B25/45H01M4/5825H01M10/54Y02E60/10Y02W30/84
Inventor 张哲鸣吴正斌
Owner SHENZHEN INST OF ADVANCED TECH CHINESE ACAD OF SCI
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