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Method for separating, purifying and recycling positive electrode material of waste lithium ion battery and obtained positive electrode material

A lithium-ion battery and ion battery technology, applied in chemical instruments and methods, battery recovery, recycling technology, etc., can solve the problems of entrainment loss of valuable metals, high separation cost, complicated process, etc., and achieve good economic benefits, separation Good effect and low acidity in stripping

Pending Publication Date: 2022-03-29
BOTREE CYCLING SCI & TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, the above-mentioned process is complicated, and the separation cost of recovering nickel, cobalt and manganese elements is high, and the calcium and magnesium in the solution affect the extraction of nickel, cobalt and manganese, and it is difficult to separate; among them, the precipitation method will also cause entrainment loss of valuable metals

Method used

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  • Method for separating, purifying and recycling positive electrode material of waste lithium ion battery and obtained positive electrode material

Examples

Experimental program
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Effect test

Embodiment 1

[0109] A method for separating, purifying and reclaiming waste lithium-ion battery cathode materials:

[0110] (1) Positive electrode material leaching: the waste nickel-cobalt-manganese lithium-ion battery is disassembled, discharged and broken, and the broken waste batteries are leached with hydrochloric acid and reducing agent (hydrogen peroxide) to obtain a leachate, the composition of the leachate is as follows As shown in Table 1;

[0111] (2) Purify and remove impurities:

[0112] Use NaOH solution to adjust the pH value of the leachate to 4.5, add sodium persulfate as an oxidant, and first filter and remove Fe and Al ions in the leachate in the form of hydroxide precipitation to obtain a feed solution after removing iron and aluminum;

[0113] Use Mextral 984H extractant after saponification (volume fraction is 20%, diluent is sulfonated kerosene, saponification agent is 8mol / L NaOH solution) to extract Cu ions in the feed liquid after removing iron and aluminum, and ...

Embodiment 2

[0125] A method for separating, purifying and reclaiming waste lithium-ion battery cathode materials:

[0126] (1) Positive electrode material leaching: Disassemble, discharge and crush the waste nickel-cobalt-manganese lithium-ion battery, and use hydrochloric acid and reducing agent (sodium sulfite) to leach the waste battery sheet after the crushing to obtain a leachate. The composition of the leachate is shown in Table 2 shown;

[0127] (2) Purify and remove impurities:

[0128] After saponification, the CP50 extractant (volume fraction is 20%, the diluent is sulfonated kerosene, and the saponification agent is 6mol / L NaOH solution) is used to extract Cu ions in the leachate, and the extraction stage is 1, compared to 0.25: 1. The stirring speed is 150r / min, the time is 15min, the experimental temperature is 30°C, the pH of the aqueous phase is controlled to 2.5, and the copper-loaded organic phase and the copper-removed feed liquid are respectively obtained after phase s...

Embodiment 3

[0141] A method for separating, purifying and reclaiming waste lithium-ion battery cathode materials:

[0142] (1) Positive electrode material leaching: Disassemble, discharge and crush the waste nickel-cobalt-manganese lithium-ion battery, and use hydrochloric acid and reducing agent (ascorbic acid) to leach the waste battery sheet after the crushing to obtain a leachate. The composition of the leachate is shown in Table 3 shown;

[0143] (2) Purification and removal of impurities: at a temperature of 20°C, the carboxylic acid extractant BC196 (the material corresponding to m=8 and n=6 in the general formula) and the NaOH alkali solution and diluent with a concentration of 14mol / L Escaid 110 mixed saponification, the volume fraction of carboxylic acid extractant BC196 is 25%, as the organic phase system, the leachate is used as the water phase system, respectively flows in from both ends of the extractor, flows in opposite directions, and the number of stages is For 11-stage e...

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Abstract

The invention provides a method for separating, purifying and recycling a waste lithium ion battery positive electrode material and the obtained positive electrode material, the waste lithium ion battery positive electrode material is subjected to acid leaching, purification and impurity removal, co-extraction, spray pyrolysis and calcination synthesis to obtain nickel cobalt lithium manganate, and the nickel cobalt lithium manganate is directly sold as a ternary positive electrode material; wherein products of the spray pyrolysis process comprise magnesium oxide and hydrochloric acid, the magnesium oxide and the hydrochloric acid are respectively used as a saponifying agent and a stripping agent to return to the purification and impurity removal process and the co-extraction process for cyclic utilization, and the hydrochloric acid can also be used as a leaching agent to be reused in the positive electrode material leaching process. According to the method, wet purification and pyrogenic purification are organically coupled, valuable elements nickel, cobalt and manganese in the battery feed liquid are synchronously extracted and are not influenced by impurity ions such as calcium and magnesium, meanwhile, by-products and flue gas waste heat in the technological process are fully utilized, effective recycling of materials and gradient utilization of heat are achieved, no waste water and waste residues are generated, tail gas reaches the standard and is discharged, and the method is suitable for industrial production. The method belongs to a green cleaning process technology.

Description

technical field [0001] The invention belongs to the field of resource recycling, and in particular relates to a method for separating, purifying and recycling waste lithium-ion battery cathode materials and the obtained cathode materials. Background technique [0002] With the rapid development and promotion of electric vehicles, the demand for lithium-ion batteries is also expanding, and the number of waste lithium-ion batteries is also increasing day by day. Nickel-cobalt-manganese ternary cathode material has good cycle performance, stable structure, and high cost performance. It is a new type of lithium-ion battery cathode material, and the main raw materials of the precursor product of ternary cathode material are nickel salt, cobalt salt, and manganese salt. If waste lithium batteries are discarded at will, it will not only seriously pollute the environment, but also cause a lot of waste of valuable metal resources. The best way to solve this problem is to realize the ...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B23/00C22B47/00C22B3/38C22B3/32C01G53/00H01M10/54
CPCC22B7/007C22B23/00C22B47/00C22B7/001C01G53/44H01M10/54Y02P10/20Y02P20/129Y02W30/84
Inventor 王雪
Owner BOTREE CYCLING SCI & TECH CO LTD