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Method for recycling lithium from positive electrode material of waste lithium ion battery

A technology for lithium ion batteries and cathode materials, which is applied in the field of waste lithium ion battery recycling, can solve the problems of short comprehensive recycling process, difficult subsequent waste liquid treatment, and no closed-loop process, so as to improve recovery rate and purity, and be convenient and easy to operate. Achieving and extracting the effect of high selectivity

Pending Publication Date: 2021-08-20
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method has a short comprehensive recovery process, but the Lewis acids used are transition metal halides, transition metal sulfates and transition metal nitrates, which are not only costly, but also difficult to treat the subsequent waste liquid, and are prone to environmental pollution.
[0006] It can be seen from the above that the cost of the current lithium pre-extraction process is high, and the process does not form a closed loop, resulting in large consumption of raw materials and easy pollution to the environment
At the same time, the current lithium precipitation process often uses Na 2 CO 3 As a precipitant, subsequent crystallization generates a large amount of Na 2 SO 4 pile up beyond disposal

Method used

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  • Method for recycling lithium from positive electrode material of waste lithium ion battery

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Effect test

Embodiment 1

[0037] A method for reclaiming lithium from waste lithium-ion battery cathode materials, comprising the following steps:

[0038] (1) Combine waste nickel-cobalt lithium manganese oxide cathode material with (NH 4 ) 2 SO 4 press n (NH4)2SO4 :n Li = 1:1 After fully mixing, carry out sulfate roasting at 500°C for 60 minutes, the waste positive electrode material is decomposed, and lithium ions are extracted from the crystal structure.

[0039] (2) Disperse the calcined product in deionized water (solid-to-liquid ratio 3:1), water leaching temperature is 45°C, leaching time is 25min, after leaching is completed, filter and separate to obtain lithium-rich leachate and transition metal slag phase.

[0040] After sampling and diluting the lithium-rich leaching solution, an inductively coupled plasma emission spectrometer was used to analyze and measure the mass fraction of lithium in it to be 15g / L, and Al and Fe to be less than 0.6g / L. The leaching slag sample was taken, and t...

Embodiment 2

[0042] A method for reclaiming lithium from waste lithium-ion battery cathode materials, comprising the following steps:

[0043] (1) Combine waste nickel-cobalt lithium manganese oxide cathode material with (NH 4 ) 2 SO 4 press n (NH4)2SO4 :n Li = 2:1 After fully mixing, sulfuration roasting is carried out at 600°C for 80 minutes, the waste positive electrode material is decomposed, and lithium ions are extracted from the crystal structure.

[0044] (2) The roasted product was dissolved in deionized water (solid-to-liquid ratio 3:1), the water leaching temperature was 45°C, and the leaching time was 25 minutes. After filtration and separation, the lithium-rich leaching solution and transition metal slag phase were obtained.

[0045] After sampling and diluting the lithium-rich leaching solution, an inductively coupled plasma emission spectrometer was used to analyze and measure the mass fraction of lithium in it to be 14.5g / L, and Al and Fe to be less than 0.5g / L. The le...

Embodiment 3

[0047] A method for reclaiming lithium from waste lithium-ion battery cathode materials, comprising the following steps:

[0048] (1) Combine waste lithium cobaltate cathode material with (NH 4 ) 2 SO 4 press n (NH4)2SO4 :n Li = 2:1 After fully mixing, sulfuration roasting is carried out at 600°C for 80 minutes, the waste positive electrode material is decomposed, and lithium ions are extracted from the crystal structure.

[0049] (2) The roasted product was dissolved in deionized water (solid-to-liquid ratio 3:1), the water leaching temperature was 40°C, and the leaching time was 30 minutes. After filtration and separation, the lithium-rich leaching solution and transition metal slag phase were obtained.

[0050] After sampling and diluting the lithium-rich leaching solution, an inductively coupled plasma emission spectrometer was used to analyze and determine that the mass fraction of lithium was 15.8 g / L, and Al and Fe were less than 0.5 g / L. The leaching slag sample w...

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Abstract

The invention relates to the field of recycling of waste lithium ion batteries, and provides a method for recycling lithium from a positive electrode material of a waste lithium ion battery. The method comprises the following steps: mixing the positive electrode material of the waste lithium ion battery with (NH4)2SO4 for sulfating roasting, destroying a layered structure of the positive electrode material so as to smoothly remove lithium ions, and performing water leaching on the roasted product to obtain a lithium-rich leaching solution and a transition metal oxide slag phase. Ammonium carbonate is added into the leaching solution after impurity removal and purification, lithium is recycled in the form of Li2CO3 precipitation at a certain temperature, and the solution is evaporated and crystallized after lithium precipitation to prepare (NH4)2SO4 so that the recycling of the lithium in the positive electrode material of the waste lithium ion battery and the recycling of (NH4)2SO4 are realized, and the lithium-containing residual solution can be recycled in a water leaching stage. The method is short in recycling process, low in cost and clean in process, and the purity of the obtained lithium carbonate is as high as 99.6 wt%.

Description

technical field [0001] The invention relates to the field of recycling of waste lithium ion batteries, in particular to a method for extracting lithium elements from positive electrode materials of waste lithium ion batteries. Background technique [0002] Due to the continuous depletion of fossil energy and the massive emission of greenhouse gases on a global scale, the earth's ecological environment has continued to deteriorate, hindering the continuous advancement of human civilization, so lithium-ion batteries have emerged as the times require, and have become portable electronic products and vehicles. alternatives. Lithium-ion batteries are widely used in the consumer battery market due to their advantages such as high capacity, high specific energy density, high working voltage, low self-discharge, and good cycle performance, and occupy a major share of the power battery market in the field of electric vehicles. Statistics from the Ministry of Industry and Information...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B3/44C22B1/02C22B3/04C22B26/12H01M10/54
CPCC22B7/006C22B3/44C22B1/02C22B3/04C22B26/12H01M10/54Y02W30/84Y02P10/20
Inventor 蒋良兴李芳成杨健刘芳洋贾明
Owner CENT SOUTH UNIV
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