Short-process recovery method of waste lithium iron phosphate positive electrode material

A technology for lithium iron phosphate and positive electrode materials, which is applied in the field of short-process recycling of waste lithium iron phosphate positive electrode materials, can solve the problems of high cost and long recycling process of waste lithium iron phosphate materials, and achieve low cost, good industrialization potential, good The effect of electrochemical performance

Pending Publication Date: 2022-01-28
STATE GRID HEILONGJIANG ELECTRIC POWER CO LTD ELECTRIC POWER RES INST +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a short-process recycling method for waste lithium iron phosphate cathode materials in order to solve the problems of long recovery process and high cost of existing waste lithium iron phosphate materials

Method used

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  • Short-process recovery method of waste lithium iron phosphate positive electrode material
  • Short-process recovery method of waste lithium iron phosphate positive electrode material
  • Short-process recovery method of waste lithium iron phosphate positive electrode material

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Experimental program
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specific Embodiment approach 1

[0027] Specific implementation mode 1: In this implementation mode, a short-process recovery method of waste lithium iron phosphate positive electrode material is carried out according to the following steps:

[0028] 1. Soak the positive electrode sheet material of the waste lithium iron phosphate battery in deionized water at 25°C for 0.5-1min, and then soak in deionized water at 90°C for 0.5-1min; repeat the above steps twice to obtain a sheet Waste lithium iron phosphate material; after drying the waste lithium iron phosphate material in pieces, place them in a ball mill to grind for 1-3 hours to obtain waste lithium iron phosphate material powder, the ball-to-material ratio is (10-30):1;

[0029] 2. Put the waste lithium iron phosphate material powder in N-methyl-2 pyrrolidone, stir magnetically for 10-14 hours, filter after the stirring, and obtain a black precipitate. The quality of the waste lithium iron phosphate material powder is the same as that of N- The volume ra...

specific Embodiment approach 2

[0030] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the positive electrode sheet material of the waste lithium iron phosphate battery described in step 1 is the waste lithium iron phosphate positive electrode sheet that has been cycled 500 times, 1000 times and 1500 times.

[0031] Other steps are the same as in the first embodiment.

specific Embodiment approach 3

[0032] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that the drying in step 1 is: drying the waste lithium iron phosphate material in pieces at a temperature of 60°C for 8 hours.

[0033] Other steps are the same as those in Embodiment 1 or 2.

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Abstract

The invention discloses a short-process recovery method of a waste lithium iron phosphate positive electrode material, and relates to a short-process recovery method of a waste lithium iron phosphate positive electrode material. The invention aims to solve the problems of long recovery process and high cost of existing waste lithium iron phosphate materials. The method comprises the following steps: repeatedly and alternately soaking the positive plate material of the waste lithium iron phosphate battery in deionized water at 25 DEG C and 90 DEG C for three times to obtain a sheet of waste lithium iron phosphate material; drying a sheet of waste lithium iron phosphate material, and grinding in a ball mill for 1-3 hours to obtain waste lithium iron phosphate material powder; and putting the waste lithium iron phosphate material powder into N-methyl-2-pyrrolidone, performing magnetic stirring for 10-14 hours, performing filtering after the stirring to obtain a black precipitate, performing centrifuging and cleaning by using an organic solvent, and performing drying to obtain a waste lithium iron phosphate positive electrode material. The short-process recovery method of the waste lithium iron phosphate positive electrode material can be obtained.

Description

technical field [0001] The invention relates to a short-flow recycling method for waste lithium iron phosphate cathode materials. Background technique [0002] Under the background of the rapid development of new energy vehicles, the sales of lithium iron phosphate batteries are increasing rapidly. Since lithium iron phosphate does not contain precious metal elements, the economic benefits of wet recycling are poor, and failure to recycle a large number of waste batteries will lead to environmental problems and waste of lithium resources. , so the recycling of waste lithium iron phosphate batteries has always attracted much attention. [0003] The recovery of waste lithium iron phosphate cathode materials is mainly divided into the process of separating the cathode material from the current collector and the treatment process of the cathode material. The process of separating the cathode material from the current collector can be divided into two methods: soaking separation ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/54H01M4/136
CPCH01M10/54H01M4/136H01M2004/028Y02E60/10Y02W30/84
Inventor 梁建权刘铸杨超月蔡南张健张德文张航王悦曲利民谭龙张朋戴长松贾雯博宫铭辰周洪毅魏春明陈世玉赵雷雷
Owner STATE GRID HEILONGJIANG ELECTRIC POWER CO LTD ELECTRIC POWER RES INST
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