Method for recovering and preparing lithium iron phosphate from waste lithium iron phosphate battery

A lithium iron phosphate battery, lithium iron phosphate technology, applied in the direction of battery recycling, waste collector recycling, recycling technology, etc., can solve the problem of low lithium recovery rate, achieve improved electrochemical performance, simple process, and easy operation Effect

Active Publication Date: 2012-10-24
ZHEJIANG UNIV
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

The publication number is CN102208706A, and the name is "a method for recovering and regenerating the positive electrode material of the waste lithium iron phosphate battery". "The Chinese invention patent applications of "separate the positive and negative plates first and then carry out follow-up treatment on the positive plate separately. The recovery rate of lithium is not high, and there is a lack of lithium in the recovered materials. The follow-up treatment must supplement lithium sources to obtain new iron phosphate. Lithium battery cathode material

Method used

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  • Method for recovering and preparing lithium iron phosphate from waste lithium iron phosphate battery
  • Method for recovering and preparing lithium iron phosphate from waste lithium iron phosphate battery
  • Method for recovering and preparing lithium iron phosphate from waste lithium iron phosphate battery

Examples

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Effect test

Embodiment 1

[0046] Take the waste lithium iron phosphate power battery of model A123, disassemble it, peel off the battery casing, and then soak it in deionized water, that is, separate the positive electrode sheet, negative electrode sheet, separator, electrolyte and conductive parts except the battery casing. Put the agent into deionized water together, perform ultrasonic 0.5h and mechanical stirring for 0.5h alternately, repeat 8 times in total, that is, ultrasonic and mechanical stirring are carried out for a total of 8h, until the positive and negative powders are separated from the pole piece, take out the aluminum foil and copper foil and Diaphragm, and the rest is a mixed solution. In the A123 lithium iron phosphate power battery, the aluminum foil is used as the positive electrode substrate, and the copper foil is used as the negative electrode substrate;

[0047] Evaporate part of the water from the mixed solution, put it into a planetary ball mill and mill it at a speed of 400r / ...

Embodiment 2

[0052] Take 1 kg of recycled material prepared in Example 1 and then add 100 g of starch and 0.0816 mol of manganese acetate to perform high-energy ball milling at a speed of 2000 r / min for 3 hours. The mass ratio is 8:1, and spray drying is adopted after high-energy ball milling. The solid-solid ratio of the feed liquid (solvent is water) in spray drying is 38%, and the recovered waste pre-burned material is obtained; among them, the particle size after high-energy ball milling is mainly Concentrated at 0.9mm±0.2mm, pH is 8.2;

[0053] The recycled waste pre-sintered material was solid-phase sintered in a nitrogen protective atmosphere at 600°C for 8 hours to obtain a lithium iron phosphate product. The X-ray diffraction (XRD) diffraction pattern of the lithium iron phosphate product is as follows Figure 4 As shown, the molar ratio of Li:Fe:P in the lithium iron phosphate product obtained through ICP analysis is 1:1:1.

[0054] Mix and grind the lithium iron phosphate produ...

Embodiment 3

[0059] Take the waste lithium iron phosphate power battery of model A123, disassemble it, peel off the battery casing, and then soak it in acetone deionized water solution containing 20% ​​by weight of acetone, that is, separate the positive plate from the part other than the battery casing , Negative plate, diaphragm, electrolyte and conductive agent are put together, ultrasonic 0.5h and mechanical stirring are carried out alternately for 0.5h, and repeated 4 times in total, that is, ultrasonic and mechanical stirring are carried out for a total of 4h until the positive and negative powders are separated from the pole piece , take out the aluminum foil, copper foil and diaphragm, and the rest is a mixed solution;

[0060] Evaporate part of the water from the mixed solution, put it into a planetary ball mill and mill it at a speed of 400r / min for 12 hours, take it out and dry it in an oven at 60°C for 12 hours, put the dried material into a tube sintering furnace under an oxyge...

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Abstract

The invention discloses a method for recovering and preparing lithium iron phosphate from waste lithium iron phosphate batteries. The method comprises: 1) dismantling the recovered waste lithium iron phosphate batteries, stripping battery cases, immersing the batteries, separating the electrode plates from the powder material of positive and negative terminals through a method of alternation of ultrasonic and mechanical stirring, taking out the electrode plates and diaphragms, and obtaining mixed liquor; 2) performing a preliminary ball milling to the mixed liquor, and drying the uniformly mixed slurry obtained by the preliminary ball milling; 3) calcining the dried material in oxidizing atmosphere to obtain a recovered material, adding iron source, phosphorous source and optionally new lithium iron phosphate, then adding carbon source, high energy ball milling the obtained material, drying the material to obtain a pre-burning material of the recovered material; 4) microwave sintering or solid state sintering the pre-burning material of the recovered material in protective atmosphere to obtain the product of lithium iron phosphate. The preparation method has the advantages of environmental protection, no pollution, simpleness and practicality, high production utilization rate, simple

Description

technical field [0001] The invention relates to the field of recycling lithium iron phosphate waste batteries, in particular to a method for recycling and preparing lithium iron phosphate from lithium iron phosphate waste batteries. Background technique [0002] The "Suggestions of the Central Committee of the Communist Party of China on Formulating the Twelfth Five-Year Plan for National Economic and Social Development" clearly stated that new energy vehicles are listed as one of the seven strategic emerging industries to accelerate cultivation and development, and will continue to be used in funds and policies. support at the level. The power battery is the core of the value chain of new energy vehicles and the brain of the power system of new energy vehicles. Ni-MH batteries or lithium-ion batteries are the main power battery products of new energy vehicles. As a kind of lithium-ion battery, lithium iron phosphate battery has the most potential and will replace nickel-me...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/54C01B25/45
CPCY02E60/12Y02W30/84
Inventor 赵新兵周斌曹高劭朱允广谢健
Owner ZHEJIANG UNIV
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