Method for recycling valuable metals from waste lithium ion batteries

A lithium-ion battery and valuable metal technology, which is applied in the field of waste battery recycling, can solve the problems of large consumption of chemical reagents, complex process, low metal recovery rate, etc., and achieves the effects of low cost, simple process, and reduction of the addition of chemical reagents

Inactive Publication Date: 2021-01-22
SINOSTEEL NANJING NEW MATERIALS RES INST CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the existing problems of complex process, high consumption of chemical reagents and low metal recovery rate when extracting lithium from waste lithium ion batteries, the present invention provides a method for recovering valuable metals from waste lithium ion batteries

Method used

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  • Method for recycling valuable metals from waste lithium ion batteries

Examples

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Effect test

Embodiment 1

[0048] The waste lithium cobalt oxide battery was charged at a constant current of 0.2C to a battery voltage of 4.2V, and then crushed and sorted in a closed environment filled with nitrogen to obtain a mixture of positive and negative electrodes. Calcinate the mixture at 800°C for 5h, then take out the calcined slag, add deionized water according to the solid-to-liquid ratio of 1:5, stir in a water bath at 20°C for 2h, separate the leachate from solid to liquid, add sodium carbonate to the filtrate to obtain lithium carbonate Precipitation, the filter residue is metallic cobalt and its oxides. The recovery rate of lithium and other metals obtained is above 95%, and the purity is high.

Embodiment 2

[0050] Charge the waste lithium manganese oxide battery with a constant current at a rate of 0.1C until the battery voltage is 3.5V, and then place it in a closed environment filled with nitrogen for crushing and sorting to obtain a mixture of positive and negative electrodes. Calcinate the mixture at 700°C for 10 hours, then take out the calcined slag, add deionized water according to the solid-to-liquid ratio of 1:8, stir in a water bath at 60°C for 3 hours, separate the leachate from solid to liquid, and add sodium carbonate to the filtrate to obtain lithium carbonate Precipitation, the filter residue is metal manganese and its oxides. The recovery rate of lithium and other metals obtained is above 95%, and the purity is high.

Embodiment 3

[0052] The waste nickel-cobalt lithium manganese oxide battery is charged at a constant current of 0.5C to a battery voltage of 4.5V, and then crushed and sorted in a closed environment filled with nitrogen to obtain a mixture of positive and negative electrodes. Calcinate the mixture at 900°C for 2 hours, then take out the calcined slag, add deionized water according to the solid-to-liquid ratio of 1:10, stir in a water bath at 80°C for 1 hour, separate the leachate from solid to liquid, add sodium carbonate to the filtrate to obtain lithium carbonate Precipitation, the filter residue is metal nickel, cobalt, manganese and its oxides. The recovery rate of lithium and other metals obtained is above 95%, and the purity is high.

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Abstract

The invention discloses a method for recycling valuable metals from waste lithium ion batteries, and belongs to the technical field of waste battery recycling. The method comprises the following steps: (1) charging a waste lithium ion battery; (2) crushing the charged battery, and sorting the materials to obtain a mixture of a positive electrode material and a negative electrode material; (3) calcining the mixture of the positive electrode material and the negative electrode material at high temperature; (4) putting the calcined material into water, performing stirring, performing filtering, adding sodium carbonate into the filtrate to obtain lithium carbonate, and taking the filter residue as a metal simple substance and an oxide thereof. Part of lithium ions are transferred to the negative electrode material through charging, and then the lithium and other metals can be recycled through simple processes such as calcination and water leaching of the positive electrode and negative electrode mixture. The method is simple, effective and suitable for large-scale production.

Description

technical field [0001] The invention belongs to the technical field of waste battery recovery, and more specifically relates to a method for recovering valuable metals from waste lithium ion batteries. Background technique [0002] Lithium-ion batteries have the advantages of high energy density, long cycle life and good safety, and are widely used in 3C digital, electric tools and electric vehicles. In recent years, with the upgrading of technology, the replacement rate of digital products has accelerated, and the usage of lithium-ion batteries has gradually increased. Ion batteries are heavily used. According to statistics, the amount of scrapped power lithium-ion batteries alone will reach 280,000 tons in 2020. Such a large amount of scrapped urgently needs to be recycled. This is not only in line with the concept of an environmentally friendly society, but also maximizes the use of resources. [0003] Most of the treatment of waste lithium-ion batteries is to recover t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/54C22B7/00C22B26/12C22B23/00C22B1/02
CPCH01M10/54C22B7/006C22B26/12C22B23/04C22B1/02Y02W30/84Y02P10/20
Inventor 李涛骆艳华刘晨鲍维东
Owner SINOSTEEL NANJING NEW MATERIALS RES INST CO LTD
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