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Waste Ni-Co-Mn lithium manganate positive electrode material recycling method

A technology of nickel-cobalt lithium manganese oxide and positive electrode materials, which is applied in the field of recycling waste nickel-cobalt lithium manganese oxide positive electrode materials, can solve the problems of long process flow, high recovery cost and low profit of the recovery process, and achieve short process flow and high-quality products. The effect of high added value and high recovery rate

Active Publication Date: 2018-09-14
中锂能新能源科技(烟台)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] For the recovery of nickel-cobalt lithium manganese oxide cathode material, because it contains precious metals such as cobalt and nickel, its recovery value is relatively high, but the conventional recovery process has high recovery cost, long process and low profit, and will generate a large amount of waste water

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0030] A kind of recovery method of waste and old nickel-cobalt lithium manganese oxide cathode material, it is the following steps:

[0031] (1) Pretreatment, disassemble the waste nickel-cobalt lithium manganese oxide battery, put the positive plate into the liquid nitrogen freezer for crushing, then sieve, pass through a 150-mesh sieve, and return the sieve to continue freezing and crushing. The sieve is ready for use;

[0032](2) Put the undersize obtained in step (1) into the reduction furnace, feed hydrogen to reduce, the residence time of the undersize in the reduction furnace is 10 hours, and the charging thickness of the undersize in the sagger 4.5cm, the flow rate of hydrogen in the reduction furnace is 4m / s, the hydrogen content in the atmosphere in the reduction furnace is greater than 99.5%, the reduction temperature is 425°C, and then it is cooled to the temperature <40°C in the cooling section of the reduction furnace before it is released from the furnace get ...

Embodiment 2

[0045] A kind of recovery method of waste and old nickel-cobalt lithium manganese oxide cathode material, it is the following steps:

[0046] (1) Pretreatment, disassemble the waste nickel-cobalt lithium manganese oxide battery, put the positive plate into the liquid nitrogen freezer for crushing, then sieve, pass through a 120-mesh sieve, and return the sieve to continue freezing and crushing. The sieve is ready for use;

[0047] (2) put the undersize obtained in step (1) into the reduction furnace, feed hydrogen to reduce, the residence time of the undersize in the reduction furnace is 11 hours, and the charging thickness of the undersize in the sagger 4.2cm, the flow rate of hydrogen in the reduction furnace is 4.5m / s, the hydrogen content in the atmosphere in the reduction furnace is greater than 99.5%, the reduction temperature is 440°C, and then cooled to the temperature <40°C in the cooling section of the reduction furnace out of the furnace to obtain the raw materials...

Embodiment 3

[0061] A kind of recovery method of waste and old nickel-cobalt lithium manganese oxide cathode material, it is the following steps:

[0062] (1) Pretreatment, disassemble the waste nickel-cobalt lithium manganese oxide battery, put the positive plate into the liquid nitrogen freezer for crushing, then sieve, pass through a 170-mesh sieve, return the sieve to continue freezing and crushing, The sieve is ready for use;

[0063] (2) put the undersize that step (1) obtains in the reduction furnace, pass into hydrogen to reduce, the residence time of the undersize in the reduction furnace is 9.5 hours, the charging thickness of the undersize in the sagger 4.5cm, the flow rate of hydrogen in the reduction furnace is 4.2m / s, the hydrogen content in the atmosphere in the reduction furnace is greater than 99.5%, the reduction temperature is 440°C, and then cooled to the temperature <40°C in the cooling section of the reduction furnace out of the furnace to obtain the raw materials; ...

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Abstract

The invention discloses a waste Ni-Co-Mn lithium manganate positive electrode material recycling method. The waste Ni-Co-Mn lithium manganate positive electrode material recycling method comprises dismantling waste Ni-Co-Mn lithium manganate batteries, crushing positive electrode sheets, sieving and reducing crushed materials through hydrogen in a reducing furnace; washing reduced materials in hotpurified water to obtain washing solution and washed residues, inletting carbon dioxide into the washing solution to obtain lithium hydrogen carbonate solution and aluminum hydroxide precipitates, calcining the aluminum hydroxide precipitates to obtain ultrafine aluminum oxide, and pyrolyzing the lithium hydrogen carbonate solution to obtain battery-level lithium carbonate; adding the washed residues into hydrazine hydrate solution, then adding and stirring in sodium hydroxide for reaction, filtering the mixture to obtain a second filter liquor and second filtered residues, vacuum-drying thesecond filtered residues inside a vacuum drying oven, screening and magnetically-separating dried materials to obtain Ni-Co-Mn ternary alloy powder, or directly dissolving the dried materials in acidto obtain Ni-Co-Mn ternary mixed solution. The waste Ni-Co-Mn lithium manganate positive electrode material recycling method is low in cost, capable of achieving separation and recycling of all components, and high in recycling rate and value added of products.

Description

technical field [0001] The invention relates to a method for recycling waste nickel-cobalt lithium manganese oxide positive electrode materials, and belongs to the technical field of lithium battery material waste treatment. Background technique [0002] With the development of new energy vehicles, a large number of waste lithium batteries will be produced, and the recycling market will be very large. The recycling value of waste lithium batteries mainly lies in the ternary materials, cobalt, lithium, nickel and other metals. It is estimated that by 2020, the relevant market space will reach tens of billions. In recent years, especially since 2017, the prices of cobalt, lithium and other related metals have increased significantly, and the processing and utilization of waste lithium batteries is becoming more and more valuable. [0003] Nickel-cobalt lithium manganese oxide battery has the highest energy density, and with the advancement of technology, its safety has also ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/54H01M4/36H01M4/505H01M4/525H01M10/0525
CPCH01M4/364H01M4/505H01M4/525H01M10/0525H01M10/54Y02E60/10Y02W30/84
Inventor 方嘉城
Owner 中锂能新能源科技(烟台)有限公司
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