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Method for low-cost cleaning treatment of waste lithium ion battery cathode material

A lithium-ion battery and cathode material technology, which is applied in the field of low-cost clean treatment of waste lithium-ion battery cathode materials, can solve the problems of difficult utilization of composite cathode materials and difficult reuse of cathode materials, and achieves a significant and reliable separation and recovery effect The effect of technical support and efficient dissociation

Pending Publication Date: 2021-04-20
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The general components of the positive electrode materials of waste lithium batteries are lithium iron phosphate, lithium manganese oxide, lithium cobalt oxide, nickel-cobalt-manganese ternary materials, etc. Therefore, the proportion of metal elements such as nickel, cobalt, manganese, and lithium in the positive electrode materials are different, and even the proportion of the same ternary cathode material is very different. Therefore, it is difficult to reuse the cathode material, especially for the composite cathode material.

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  • Method for low-cost cleaning treatment of waste lithium ion battery cathode material
  • Method for low-cost cleaning treatment of waste lithium ion battery cathode material
  • Method for low-cost cleaning treatment of waste lithium ion battery cathode material

Examples

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Embodiment 1

[0037] A kind of method of the present invention's low-cost clean treatment waste lithium ion battery anode material, its process flow chart is as follows figure 1 shown, including the following steps:

[0038] (1) The waste lithium battery positive electrode material obtained after pretreatment (the mixture of nickel-cobalt lithium manganese oxide composite positive electrode material and nickel manganese oxide lithium composite positive electrode material) is dried, then put into the reduction furnace, under argon protective atmosphere The reduction was carried out by introducing hydrogen gas (the flow rate of hydrogen gas was 100ml / min), the reduction temperature was 600° C., and the reduction time was 0.5 h.

[0039] (2) Putting the reduced product obtained in step (1) into a ball mill for ball milling to obtain reduced product powder with a particle size of 1-200 μm.

[0040] (3) The reduced product powder obtained in step (2) is immersed in water at a temperature of 50°...

Embodiment 2

[0045] A kind of method of the present invention's low-cost clean treatment waste lithium ion battery anode material, its process flow chart is as follows figure 1 shown, including the following steps:

[0046] (1) Dry the waste lithium battery cathode material (a mixture of lithium manganate cathode material and nickel-cobalt lithium aluminate composite cathode material) obtained after pretreatment, and put the dried waste lithium ion battery cathode material into the reduction furnace , under the protective atmosphere of argon, the reduction was carried out by introducing hydrogen gas (the hydrogen flow rate was 100ml / min), the reduction temperature was 700° C., and the reduction time was 1 h.

[0047] (2) Putting the reduced product obtained in step (1) into a ball mill for ball milling to obtain reduced product powder with a particle size of 1-200 μm.

[0048] (3) Water immerse the reduced product powder obtained in step (2), the water immersion temperature is 60°C, the w...

Embodiment 3

[0053] A kind of method of the present invention's low-cost clean treatment waste lithium ion battery anode material, its process flow chart is as follows figure 1 As shown, the method includes the following steps:

[0054] (1) The waste lithium battery cathode material obtained after pretreatment (the mixture of lithium cobalt oxide cathode material and nickel cobalt manganate lithium cathode material) is dried, and the dried waste lithium ion battery cathode material is put into a reduction furnace, Under the protective atmosphere of argon gas, hydrogen gas was introduced for reduction (hydrogen gas flow rate was 100ml / min), the reduction temperature was 800°C, and the hydrogen gas reduction time was 2h.

[0055] (2) Putting the reduced product obtained in step (1) into a ball mill for ball milling to obtain reduced product powder with a particle size of 1-200 μm.

[0056] (3) Water immerse the reduced product powder obtained in step (2), the water immersion temperature is ...

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Abstract

The invention discloses a method for low-cost cleaning treatment of a waste lithium ion battery cathode material. The method comprises the following steps: carrying out high-temperature reduction and grinding on a pretreated waste lithium ion battery cathode material to obtain a reduction product with the particle size less than 200 [mu]m; carrying out water leaching on the reduction product, and carrying out solid-liquid separation to obtain water leaching residues and a filtrate; performing magnetic separation on the water leaching residues to obtain magnetic nickel-cobalt alloy and non-magnetic manganese oxide; and removing impurities from the filtrate, and carrying out evaporative crystallization on the impurity-removed filtrate to obtain a LiOH product. According to the method, hydrogen is adopted to perform selective reduction on the lithium ion battery cathode material, the lithium element in the reduction product is dissolved in an aqueous solution easily, and the lithium leaching rate can reach 95% or more through one-time water leaching without multi-stage leaching, so that the process flow is simplified while the high recovery rate of the lithium element is realized.

Description

technical field [0001] The invention belongs to the field of recycling waste lithium ion batteries, in particular to a low-cost method for cleaning and treating positive electrode materials of waste lithium ion batteries. Background technique [0002] Lithium batteries have excellent physical and chemical properties such as high energy density, high voltage, fast charging and discharging, and good cycle stability. They are widely used in electronic technology products such as mobile phones and notebook computers, and have formed a huge market size, especially electric The development of automobiles has greatly increased the demand for lithium batteries. However, the life of lithium batteries is generally only 2 to 3 years. Some waste lithium batteries can be used in cascades, and waste lithium batteries that cannot be used in cascades can only be scrapped. With the increase in the use of lithium batteries, the amount of scrapped batteries is also increasing. By 2020, the to...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B1/00B03C1/015H01M10/54C01D15/02C22B5/12
CPCH01M10/54B03C1/015C01D15/02C22B1/00C22B7/00C22B5/12
Inventor 于大伟黄柱田庆华郭学益
Owner CENT SOUTH UNIV
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