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Method for preparing iron lithium phosphate by recovering water-system waste lithium-ion power battery

A lithium-ion battery and power battery technology, applied in battery recycling, waste collector recycling, recycling technology and other directions, can solve the problem of not mentioning the lithium iron phosphate power battery recycling method, etc., to solve the recycling problem, the process is simple and feasible , the effect is obvious

Active Publication Date: 2010-12-15
长春劲能科技集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the recovery of lithium-ion power batteries of different systems has its own characteristics, and the above-mentioned published patents are not applicable to the recovery of power batteries of all systems
Moreover, these patents are only for the recycling and reuse of waste materials and waste chips generated in production, and do not mention the overall recycling method of lithium iron phosphate power batteries

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] After the waste water-based lithium iron phosphate power battery is discharged, the battery is shelled, the battery core is taken out, and the battery is mechanically crushed. The waste lithium-ion battery is discharged, shelled, and the battery core is taken out. After the battery core is cut and broken, Weigh 200g of cell fragments, add 6L of deionized water, and sieve after stirring for 1 hour at 20°C. The part above the sieve is the current collector, and the part below the sieve is the mixture of electrode material and conductive agent. After drying the electrode material and conductive agent mixture, add 0.1M hydrochloric acid, and the solid-to-liquid ratio of the mixed solution is 50g / L. Stir at 20°C to make it fully react, and filter to obtain Li + , Fe 2+ 、PO 4 3- acidic solution. Contain Li to 1L + , Fe 2+ 、PO 4 3- Add 50ml of LiOH with a concentration of 1mol / L to the acidic solution to make n Li+ : n Fe2+ : n PO43- =0.8:1:1, add 10 g of ascorbic a...

Embodiment 2

[0025] After the waste water-based lithium iron phosphate power battery is discharged, the battery is shelled, the battery core is taken out, and the battery is mechanically crushed. The waste lithium-ion battery is discharged, shelled, and the battery core is taken out. After the battery core is cut and broken, Weigh 100g of cell fragments, add 10L of deionized water, stir at 100°C for 3 hours, sieve and recover the electrode material and conductive agent mixture. After drying the mixture of the electrode material and the conductive agent, add 5M sulfuric acid, and the solid-to-liquid ratio of the mixed solution is 5g / L. Stir at 100°C to make it fully react, and filter to obtain Li + , Fe 2+ 、PO 4 3- acidic solution. Contain Li to 1L + , Fe 2+ 、PO 4 3- Add 950ml of LiOH with a concentration of 1mol / L to the acidic solution to make n Li+ : n Fe2+ : n PO43- =1.2:1:1, add 200 g of ascorbic acid, stir for 1 hour at 100° C., adjust the pH value of the mixed solution wit...

Embodiment 3

[0027]After the waste water-based lithium iron phosphate power battery is discharged, the battery is shelled, the battery core is taken out, and the battery is mechanically crushed. The waste lithium-ion battery is discharged, shelled, and the battery core is taken out. After the battery core is cut and broken, Weigh 1Kg of cell fragments, add 50L of deionized water, stir at 50°C for 2 hours, then sieve and recover the electrode material and conductive agent mixture. After drying the mixture of the electrode material and the conductive agent, 3M sulfuric acid was added, and the solid-to-liquid ratio of the mixed solution was 20 g / L. Stir at 60°C to make it fully react, and filter to obtain Li + , Fe 2+ 、PO 4 3- acidic solution. Contain Li to 1L + , Fe 2+ 、PO 4 3- Add 500ml of ferrous sulfate with a concentration of 2mol / L to the acidic solution to make n Li+ : n Fe2+ : n PO43- =1.2:1:1, add 150 g of ascorbic acid, stir for 2 hours at 80° C., adjust the pH value of t...

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Abstract

The invention discloses a method for preparing iron lithium phosphate by recovering water-system waste lithium-ion power batteries, comprising the following steps: 1) cutting and brushing a water-system waste lithium-ion power battery, processing by deionized water, sieving and drying to recover the mixture of an electrode material and a conductive agent; 2) adding inorganic acid to the dried mixture of the electrode material and the conductive agent to process, filtering to obtain acid solution containing Li+, Fe2+ and PO43-; 3) adding lithium salt or iron salt to the acid solution containing Li+, Fe2+ and PO43-, adding ascorbic acid and stirring, controlling the pH value to equal to 3-7, and filtering to obtain precipitation; and 4) adding the crude product LiFePO4 obtained in step 3) to a water solution of cane sugar for ball milling, drying and calcining to obtain a regenerative LiFePO4 material. The method has low cost, simple operation and no secondary pollution.

Description

technical field [0001] The invention relates to a method for preparing lithium iron phosphate by recycling waste lithium-ion power batteries in a water system, and belongs to the technical field of recycling and recycling of waste lithium-ion batteries. Background technique [0002] Lithium-ion power batteries with lithium iron phosphate as the cathode material have been widely used in the electric vehicle industry due to their low cost, good cycle performance, and good safety performance. The consumption of huge lithium-ion power batteries has brought a surprising number of waste batteries, and many of these waste lithium-ion power batteries are directly treated as garbage, which is not only a waste of resources, but also pollutes the environment. Therefore, the recovery of lithium-ion power batteries is of great significance. [0003] Traditional lithium iron phosphate power batteries usually use PVDF as a binder. This oily binder not only increases the cost, but also pol...

Claims

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Application Information

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IPC IPC(8): H01M10/54
CPCY02W30/84
Inventor 谢海明王钊王荣顺康书文
Owner 长春劲能科技集团有限公司
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