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Regeneration process of waste lithium iron phosphate battery cathode material

A technology for lithium iron phosphate batteries and positive electrode materials, applied in battery electrodes, lithium batteries, battery recycling, etc., can solve the problems of inability to obtain economic benefits, high equipment and operation requirements, high recycling costs, etc., and achieve fine grain size , low recycling cost, good market prospects and application prospects

Active Publication Date: 2021-04-02
台州市宸明新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the recovery of lithium iron phosphate cathode materials in China is mainly heat treatment and wet recovery. These synthesis methods have the advantages of high purity of synthetic materials, uniform distribution, and low sintering temperature, but the synthesis process is relatively complicated, equipment and operation The requirements are high, the recycling cost remains high, and good economic benefits cannot be obtained, so it has little significance for industrial applications and is difficult to industrialize large-scale production

Method used

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  • Regeneration process of waste lithium iron phosphate battery cathode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] According to the actual situation, operate as follows:

[0034] (1) Add 200 positive pole pieces to the crusher, start the machine and tear the strip-shaped pole pieces into flakes, and collect them for later use;

[0035] (2) Put the broken positive electrode sheet into the metal tray, then push it into the ultra-high temperature oven, close the oven door and then vacuumize, stop vacuuming when the vacuum degree reaches 3Pa, and inject nitrogen until the pressure is a slight positive pressure of 2.5 kPa, turn on the oven, heat up to 410°C, and keep it warm for 1h;

[0036] (3) Add the baked positive electrode sheet into the ultrasonic vibrating sieve, and turn on the ultrasonic vibrating sieve. After ultrasonic vibration, the aluminum foil is sieved from the upper discharge port, and the aluminum foil is recycled; the positive electrode material is screened out from the lower discharge port through the screen, and the positive electrode material is collected for later...

Embodiment 2

[0042] According to the actual situation, operate as follows:

[0043] (1) Add 200 positive pole pieces to the crusher, start the machine and tear the strip-shaped pole pieces into flakes, and collect them for later use;

[0044] (2) Put the broken positive electrode sheet into the metal tray, and then push it into the ultra-high temperature oven, close the oven door and vacuumize, stop vacuuming when the vacuum degree reaches 3Pa, and feed ammonia decomposition gas until the pressure is slightly positive Pressure 3kPa, turn on the oven, heat up to 470°C, keep warm for 0.5h;

[0045] (3) Add the baked positive electrode sheet into the ultrasonic vibrating sieve, and turn on the ultrasonic vibrating sieve. After ultrasonic vibration, the aluminum foil is sieved from the upper discharge port, and the aluminum foil is recycled; the positive electrode material is screened out from the lower discharge port through the screen, and the positive electrode material is collected for la...

Embodiment 3

[0051] According to the actual situation, operate as follows:

[0052] (1) Add 200 positive pole pieces to the crusher, start the machine and tear the strip-shaped pole pieces into flakes, and collect them for later use;

[0053] (2) Put the broken positive electrode sheet into the metal tray, and then push it into the ultra-high temperature oven, close the oven door and vacuumize, stop vacuuming when the vacuum degree reaches 3Pa, and introduce argon gas until the pressure is a slight positive pressure 1kPa, turn on the oven, heat up to 410°C, and keep warm for 0.5h;

[0054] (3) Add the baked positive electrode sheet into the ultrasonic vibrating sieve, and turn on the ultrasonic vibrating sieve. After ultrasonic vibration, the aluminum foil is sieved from the upper discharge port, and the aluminum foil is recycled; the positive electrode material is screened out from the lower discharge port through the screen, and the positive electrode material is collected for later use...

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Abstract

The invention provides a regeneration process of a waste lithium iron phosphate battery cathode material, and belongs to the technical field of battery recovery. The regeneration process comprises thefollowing steps: putting a positive plate obtained by splitting into a crusher, and crushing the positive plate into irregular fragments; putting the crushed positive plate into a high-temperature oven, and performing roasting in a protective atmosphere to obtain positive plate powder; screening the roasted positive plate powder to strip the positive electrode material from an aluminum foil, andthen collecting the positive electrode material and the aluminum foil for standby application; preparing supplementing liquid, and then putting the supplementing liquid and the positive electrode material into a mixer for mixing to obtain wet powder; and putting the wet powder into an atmosphere furnace, and carrying out high-temperature calcination in a protective atmosphere to obtain the regenerated positive electrode material. The regeneration process is high in recovery rate, low in cost and simple in process route.

Description

technical field [0001] The invention belongs to the technical field of battery recycling, and in particular relates to a recycling process for positive electrode materials of waste lithium iron phosphate batteries. Background technique [0002] Since the 1990s, lithium batteries have been regarded as the most promising mobile power supply, and have been widely used in fields such as computers / mobile phones / car household appliances. With the popularization of domestic vehicles in our country, the environmental problems and energy problems caused by fuel vehicles are becoming more and more serious. Electric vehicles have become an alternative product to solve this problem, and lithium iron phosphate batteries have become power batteries due to their safety and fast charging. first choice. [0003] However, lithium iron phosphate batteries, like other batteries, also contain some harmful substances. Improper recycling of waste batteries will cause serious pollution to soil / wat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M10/54H01M10/052C01B25/45
CPCH01M4/5825H01M10/54H01M10/052C01B25/45C01P2006/80C01P2002/72Y02W30/84Y02E60/10
Inventor 郭文飞张红兵黄官根孙钰
Owner 台州市宸明新能源科技有限公司
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