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A kind of lithium-ion battery cathode material recovery method

A lithium-ion battery and positive electrode material technology, applied in the field of battery materials, can solve the problems of incomplete impurity treatment, long process, harsh operating environment, etc., to improve energy utilization, eliminate environmental damage, and solve the effects of high magazine content

Active Publication Date: 2016-01-20
DONGGUAN AMPEREX TECH +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional technology, long and complex process, high requirements for equipment anti-corrosion, harsh operating environment, high operating cost
In addition, Jin Yongxun, Matsuda Guangming and others studied the recovery of lithium cobalt oxides from waste lithium-ion batteries by flotation, but the recovered lithium cobalt oxides also contain impurities such as graphite, which cannot be used to make lithium-ion batteries
[0006] CN101707269 discloses a method for recovering cathode materials by high-temperature treatment, but the pole pieces after high-temperature treatment in the recovery process need powder removal treatment, and the gas-solid two-phase contact is not sufficient during the treatment process, and the impurity treatment is not complete
The tail gas recovered at high temperature is not properly treated, the heat utilization rate is not high, and it does not meet the requirements of continuous production

Method used

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  • A kind of lithium-ion battery cathode material recovery method
  • A kind of lithium-ion battery cathode material recovery method
  • A kind of lithium-ion battery cathode material recovery method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Take 30kg of dry slurry to be recovered and put it into a pulverizer, put it into the pulverizer in batches, and after pulverizing for 10-60 minutes, pulverize into particles smaller than 5mm. Then use a 10-mesh to 200-mesh vibrating sieve to sieve the powder. The materials that do not pass through the 200-mesh sieve are further crushed and screened out, and finally a small part of the debris that cannot be filtered can be discarded. Weigh 28.5kg, add the powder from the feeding port, the gas is heated to 600°C by the heater, and enter the reactor from the bottom of the fluidized bed, and adjust the gas inlet flow rate to 8.5m 3 / h~40m 3 / h, the average residence time of the powder is 60min. After the gas passes through the cyclone separator to separate the entrained powder, it enters the fixed bed with CaO particles, and then the gas is heated and recycled. 4) After the bottom powder is cooled, use a 100-mesh to 300-mesh sieving machine to obtain qualified positive ...

Embodiment 2

[0037] Take 30kg of positive electrode pieces to be recovered and load them into a pulverizer, put them into a mixer in batches, and add an appropriate amount of zirconium glass beads for powder removal. Then sieve the processed pole piece powder with a 10-mesh to 200-mesh vibrating sieve. The materials that do not pass through the 200-mesh sieve are further crushed and screened out, and finally a small part of the debris that cannot be filtered can be discarded. Weigh 22.7kg, add the powder from the feeding port, add the powder from the feeding port, heat the gas to 600°C through the heater, and adjust the gas inlet flow rate to 8.5m 3 / h~40m 3 / h, the average residence time of the powder is 60min. After the gas passes through the cyclone separator to separate the powder, it enters the fixed bed with CaO particles, and then the gas is heated and recycled. 4) After the bottom powder is cooled, use a 100-mesh to 300-mesh sieving machine to obtain qualified positive electrode...

Embodiment 3

[0039] The difference from Example 1 is that the gas heating temperature is 750°C. Others are the same as in Embodiment 1, and will not be repeated here.

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Abstract

The invention belongs to the field of battery materials, and specifically relates to a method for recovering positive active materials from battery material offcuts and slurry. The method comprises the following steps of: filling positive plate or dry positive slurry to be recovered into a pulverizer, screening into a powder, putting the powder into a fluidized bed and removing impurities of conductive carbon and a binder; letting a gas pass through a cyclone separator on the top of the fluidized bed to remove entrained powder, passing through a fixed bed to remove harmful gases, heating and blowing into the fluidized bed for cyclic utilization, cooling the powder at the bottom, and sieving to obtain a qualified positive powder. According to the invention, the process flow is short; the powder is in a fluidization state in the fluidized bed during the process of heat treatment; and the gas and the powder fully contact with each other and the reaction is complete. Therefore, the problems of high impurity content in the product and low recovery rate in a traditional technology are fundamentally resolved; in addition, cobalt and lithium elements are simultaneously recovered, the recovery rate of an active substance reaches up to 94%, and simultaneously side-effect will not be exerted on the active substance and it selectrochemical properties.

Description

technical field [0001] The invention belongs to the field of battery materials, and more specifically relates to a method for recovering positive electrode active materials from leftover materials and slurry of battery materials. Background technique [0002] Lithium-ion batteries have been widely used as power sources for various mobile devices since their commercialization due to their high energy density, high operating voltage, no memory effect, and long cycle life. [0003] The structure of a lithium-ion battery is composed of a positive electrode and a negative electrode. The positive electrode is generally a positive electrode active material, acetylene black, and a binder that are evenly mixed and coated on an aluminum foil current collector. The usual positive electrode active materials mainly include lithium cobaltate, lithium Nickel cobalt aluminum (NCA), lithium nickel manganese cobalt (NCM), lithium manganese spinel (LMO) and lithium iron phosphate (LFP). In a ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/54B09B3/00
CPCY02W30/84
Inventor 邓耀明梅铭赖旭伦赵丰刚许瑞柳娜潘俊达
Owner DONGGUAN AMPEREX TECH
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