Environmentally friendly recovery and treatment method of waste and old lithium iron phosphate power cells

A technology for lithium iron phosphate and power batteries, which is applied in the field of green recycling of waste lithium iron phosphate power batteries, which can solve the problems of serious pollution, complicated process, and high recycling cost of lithium iron phosphate power batteries, and achieve reduced recycling costs and pure powder , excellent performance

Active Publication Date: 2015-07-29
WANXIANG 123 CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problems of high recycling cost, complicated process and serious pollution of lithium iron phosphate power battery, we propose a green recycling treatment method for waste lithium iron phosphate power battery, which can simplify the process flow, control cost and pollution

Method used

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  • Environmentally friendly recovery and treatment method of waste and old lithium iron phosphate power cells
  • Environmentally friendly recovery and treatment method of waste and old lithium iron phosphate power cells
  • Environmentally friendly recovery and treatment method of waste and old lithium iron phosphate power cells

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] 3 pieces of used 60Ah electric vehicle lithium iron phosphate power batteries were fixed to capacity, discharged at 0.2C, and when the voltage dropped to 0, the batteries were moved to a vacuum glove box, and the batteries were cut and disassembled by mechanical force. Soak the core in NMP solution, dry it after soaking for 6 hours, and directly recover the aluminum-plastic film ( figure 1 B) and tabs ( figure 1 C), while recovering the NMP solution.

[0031] Continue to use mechanical force to separate the cell to obtain the positive electrode sheet, negative electrode sheet and separator, and the separator is directly recycled ( figure 1 A).

[0032] Mechanically pulverize the positive electrode sheet and the negative electrode sheet respectively, and stop when no fragments have a side length greater than 2 cm, soak and stir the fragments in a NaON solution with a pH of 11 for 5 minutes, wash and filter. Dry the obtained material under vacuum condition, collect the...

Embodiment 2

[0038] The steps of Example 2 are basically the same as those of Example 1, except that the sieved positive electrode coarse powder containing lithium iron phosphate and acetylene black is first calcined at 250°C for 5h under nitrogen protection, and then calcined at 300°C for 10h to obtain pure Regenerated lithium iron phosphate positive electrode material; the sieved negative electrode powder containing graphite and acetylene black is calcined at 300°C under air.

[0039] According to the ratio of recovered lithium iron phosphate active material: conductive agent: binder mass ratio of 90:5:5 to make positive electrode sheet, use new graphite negative electrode sheet, diaphragm and electrolyte, in a dry glove box filled with argon The battery was assembled in the medium, and the charge and discharge test was carried out, and the results are shown in Table 1.

[0040] A battery was assembled in a dry glove box filled with argon gas according to the recovered graphite negative ...

Embodiment 3

[0042] The steps of Example 3 are basically the same as in Example 1, except that the sieved positive electrode coarse powder containing lithium iron phosphate and acetylene black is calcined at 250°C for 15h under nitrogen protection to obtain a pure regenerated lithium iron phosphate positive electrode material; The divided negative electrode powder comprising graphite and acetylene black was calcined at 250° C. under air.

[0043] According to the ratio of recovered lithium iron phosphate active material: conductive agent: binder mass ratio of 90:5:5 to make positive electrode sheet, use new graphite negative electrode sheet, diaphragm and electrolyte, in a dry glove box filled with argon The battery was assembled in the medium, and the charge and discharge test was carried out, and the results are shown in Table 1.

[0044] A battery was assembled in a dry glove box filled with argon gas according to the recovered graphite negative electrode material, new lithium iron phos...

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Abstract

The invention discloses an environmentally friendly recovery and treatment method of waste and old lithium iron phosphate power cells. The method comprises the following steps of 1, after discharge, cutting and disassembling, immersing waste and old cells into a solvent and directly recovering the immersed aluminum-plastic membrane and tabs, 2, separating the immersed cells to obtain positive plates, negative plates and diaphragms and directly recovering the diaphragms, 3, respectively carrying out mechanical crushing on the positive plates and the negative plates, immersing the crushed positive plates and negative plates in a dilute alkali solution with stirring, carrying out washing and filtration and carrying out vacuum drying, 4, respectively carrying out mechanical stirring on the dried positive and negative materials, carrying out screening to obtain aluminum foil pieces, positive crude powder, copper foil pieces and negative crude powder, recovering the separated aluminum foil pieces and the copper foil pieces, and respectively carrying out ball milling and screening on the positive crude powder and the negative crude powder, and 5, carrying out heat treatment on the screened positive crude powder and the negative crude powder and carrying out recovery. The method has simple processes, can acquire clean powder, reduces energy consumption and does not pollute the environment.

Description

technical field [0001] The invention belongs to the technical field of waste battery recycling and processing, and in particular relates to a green recycling and processing method of waste lithium iron phosphate power batteries. Background technique [0002] At present, although there are many waste lithium-ion battery recycling technologies in my country, these equipment and processes are only suitable for digital lithium-ion batteries (LiCoO 2 type, ternary type), that is, the positive electrode material is acid-dissolved to form Co 2+ , Li + etc., and then recover CoSO by extraction, chemical precipitation, and electrolysis 4 , Li 2 CO 3 、CoC 2 o 4 、Co(OH) 2 , metal Co, etc. However, these methods use a large amount of organic reagents (acids, extractants), which will cause secondary pollution to the environment; the process is complex, the requirements for equipment are high; the added value is low and the cost is high. Due to low added value and high cost, thes...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/54
CPCY02W30/84H01M10/54
Inventor 石先兴王慧敏葛民民吕豪杰高新宝陈军
Owner WANXIANG 123 CO LTD
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