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Method for recovering positive electrode material precursor and lithium carbonate from positive electrode waste material of lithium ion battery

A technology for lithium-ion batteries and positive electrode materials, which is applied in the field of efficient recovery of positive electrode material precursors and lithium carbonate, can solve the problems of comprehensive recovery of difficult and valuable metals, non-recyclable leaching agents, complex recovery processes, etc., to avoid secondary pollution , avoid impurity removal steps and extraction process, the effect of a wide range of sources

Active Publication Date: 2017-06-13
BOTREE CYCLING SCI &TECH CO LTD
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Problems solved by technology

[0005] In view of the deficiencies in the existing waste lithium-ion battery recycling technology, such as complex recycling process, low recycling efficiency, high cost, difficulty in comprehensive recovery of valuable metals, no recycling of leaching agents, etc., the present invention aims to provide a simple and efficient A method for recovering and preparing Co, Ni, Mn precursors and lithium carbonate, the leaching agent used in the method has strong selective leaching ability and high leaching rate (greater than 90%), and the leaching agent is recycled and utilized through concentrated rectification

Method used

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  • Method for recovering positive electrode material precursor and lithium carbonate from positive electrode waste material of lithium ion battery

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Embodiment 1

[0054] Lithium-ion battery positive electrode waste is leached with a mixed acid of nitric acid and citric acid containing a hydrogen peroxide reducing agent (the acid concentration is 2mol / L, and the mass percent content of the reducing agent is 3%). The leaching S / L is 50g / L, the leaching temperature is 40°C, the leaching time is 200min, and the stirring speed is 150rpm. The leaching solution and leaching residue containing Li, Ni, Co and Mn are obtained. The leaching rates of Li, Ni, Co and Mn were 92.21%, 90.60%, 91.20% and 92.5%, respectively, while the leaching rates of Al and Fe were only 1.32% and 2.76%. The leaching solution is subjected to high-temperature concentration / rectification treatment to recover the volatile leaching agent, and obtain a residual solution containing Co, Ni, Mn, and Li. The rectification / concentration temperature is 200° C., the time is 30 minutes, and the stirring speed is 150 rpm. The molar ratio of nickel, cobalt and manganese in the solu...

Embodiment 2

[0058] Lithium-ion battery positive electrode waste is leached with trichloroacetic acid and sulfuric acid mixed acid containing sodium sulfite reducing agent (acid concentration is 3mol / L, reducing agent mass percentage content is 4%). The leaching S / L is 50g / L, the leaching temperature is 40°C, the leaching time is 50min, and the stirring speed is 150rpm. The leaching solution and leaching residue containing Li, Ni, Co and Mn are obtained. The leaching rates of Li, Ni, Co and Mn were 94.60%, 92.80%, 93.20% and 93.80%, respectively, while the leaching rates of Al and Fe were only 2.12% and 3.46%. The leaching solution is subjected to high-temperature concentration / rectification treatment to recover the leaching agent, and obtain a residual solution containing Co, Ni, Mn, and Li. The molar ratio of nickel, cobalt and manganese in the solution conforms to the molecular formula LiNi x co y mn 1-x-y o 2 The molar ratio of Ni, Co and Mn in, where x>0, y>0, and x+y<1. Sodium ...

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Abstract

The invention provides a method for recovering a positive electrode material precursor and lithium carbonate from a positive electrode waste material of a lithium ion battery. The method comprises carrying out mechanical crushing on the waste produced by battery production or waste or old batteries, carrying out sorting to obtain impurity-containing positive electrode powder, carrying out immersion through a reducing agent-containing volatile leaching agent to obtain extract, carrying out concentration rectification, regenerating the volatile leaching agent, adjusting ingredients of the raffinate containing Co, Ni, Mn and Li, carrying out coprecipitation on Co, Ni and Mn, carrying out solid-liquid separation, further treating the Li-rich solution to obtain high-purity lithium carbonate, and carrying out a high temperature solid-phase reaction process on the mixed materials of Co, Ni and Mn precursors to obtain a positive electrode active material. The method is simple and is free of a complicated impurity removal process and an extraction enrichment technology. The extraction agent has a wide source, high extraction selectivity and high extraction efficiency. After the extraction reaction, the extraction agent can be recovered and recycled through concentration rectification. The method reduces a cost, can produce high-quality Co, Ni and Mn precursors and high-quality lithium carbonate and has a good application prospect.

Description

technical field [0001] The invention belongs to the technical field of recycling of secondary resources and circular economy, and in particular relates to a method for efficiently recovering positive electrode material precursors and lithium carbonate from lithium ion battery positive electrode waste. Background technique [0002] Lithium-ion batteries have many advantages such as high energy density, small self-discharge, excellent cycle performance, high charging efficiency, and no memory effect. They are widely used in various consumer electronics, military, pure electric vehicles, and aerospace applications. With the development of electric vehicles, the power lithium-ion battery will usher in a huge market in the future, and a large number of power lithium-ion battery decommissioning recycling problems will arise. With the upcoming peak of power battery scrapping, the recycling scale of used lithium-ion batteries will grow rapidly, and the market value of used battery r...

Claims

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Application Information

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IPC IPC(8): H01M10/54C22B7/00
CPCC22B7/006H01M10/54Y02W30/84Y02P10/20
Inventor 王雪
Owner BOTREE CYCLING SCI &TECH CO LTD
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