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Fluorine removal method and application of lithium-ion battery positive electrode material leachate

A lithium-ion battery and cathode material technology, applied in the field of defluorination of lithium-ion battery cathode material leaching solution, recovery of nickel, cobalt and manganese in lithium-ion battery cathode materials, can solve the problems of Ni, Co, Mn loss and low cost, and achieve The effect of reducing the amount of addition, low cost, and short cycle

Active Publication Date: 2022-02-25
BEIJING MINING & METALLURGICAL TECH GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, the method has the advantages of simple operation, short cycle, low cost, and no residual sodium ions, ammonium ions, and organic substances after fluorine removal, and solves the problem of serious loss of Ni, Co, and Mn in the prior art.

Method used

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  • Fluorine removal method and application of lithium-ion battery positive electrode material leachate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] The method for removing fluorine of the lithium-ion battery cathode material leaching solution provided in this embodiment is as follows: figure 1 As shown, it specifically includes the following steps:

[0052] (a) Water and waste LiNi with a mass ratio of 4:1 x co y mn z o 2 Lithium battery positive electrode materials are mixed to obtain a pulp; concentrated sulfuric acid is added to the pulp, and after mixing evenly, hydrogen peroxide is slowly added to it to perform a reductive acid leaching reaction. After the reaction is completed, the solid-liquid separation is obtained to obtain a leachate;

[0053] (b) Take 500mL of the leaching solution obtained in step (a), and slowly add CaCO with a mass concentration of 20% to it 3 For the dispersion liquid, adjust the pH of the mixed material to 5, carry out flocculation and precipitation at 55°C, and separate the solid and liquid after reacting for 1 hour to obtain 506 mL of the first defluorination solution;

[005...

Embodiment 2

[0060] The method for removing fluorine from the lithium-ion battery cathode material leachate provided in this embodiment comprises the following steps:

[0061] (a) Mix water with a mass ratio of 2:1 and the positive electrode material of the spent lithium nickelate battery to obtain a pulp; add concentrated hydrochloric acid to the pulp, mix well, and then slowly add hydrogen peroxide to it to carry out reductive acid leaching reaction , after the reaction is completed, the solid-liquid separation is obtained to obtain the leachate;

[0062] (b) Take 500mL of the leaching solution obtained in step (a), and slowly add NiCO with a mass concentration of 15% to it 3 Dispersion solution, adjust the pH of the mixed material to 4, carry out flocculation and precipitation at 550°C, and separate the solid and liquid after reacting for 1 hour to obtain 498mL of the first defluorination solution;

[0063] (c) Take 250mL of the first defluoridation solution obtained in step (b) and 0....

Embodiment 3

[0069] The method for removing fluorine from the lithium-ion battery cathode material leachate provided in this embodiment comprises the following steps:

[0070] (a) Water and waste LiNi with a mass ratio of 4:1 x co y mn z o 2 Lithium battery cathode materials are mixed to obtain ore pulp; acetic acid is added to the ore pulp, and after mixing evenly, hydrogen peroxide is slowly added to it to carry out reductive acid leaching reaction, and solid-liquid separation is obtained after the reaction is completed to obtain leachate;

[0071] (b) Take 500mL of the leaching solution obtained in step (a), and slowly add MnCO with a mass concentration of 20% 3 For the dispersion, adjust the pH of the mixed material to 5, carry out flocculation and precipitation at 55°C, and separate the solid and liquid after reacting for 1 hour to obtain 502 mL of the first defluorination solution;

[0072] (c) Mix 250mL of the first defluoridation solution obtained in step (b) with 1.09g of alum...

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Abstract

The invention relates to the field of purification and impurity removal of waste power battery leachate, in particular to a method for removing fluorine from the leachate of positive electrode materials of lithium ion batteries and its application. The defluorination method includes: mixing the positive electrode material, acid solution and reducing agent, performing reduction acid leaching reaction, and obtaining the positive electrode leachate after solid-liquid separation; mixing the positive electrode leachate with carbonate, performing flocculation precipitation, and then separating solid-liquid to obtain the first A fluoride removal solution; mix the first fluoride removal solution with the flocculant evenly, then add carbonate to it for flocculation and precipitation, and then separate the solid and liquid to obtain the second fluoride removal solution; in step (b) and step ( In c), during the process of flocculation and sedimentation, the pH of the mixed material is 4~6. The present invention minimizes the amount of flocculant and carbonate used while realizing deep defluorination; greatly reduces the loss rate of Ni and / or Co and / or Mn; the operation is simple, the cycle is short, and the cost is low.

Description

technical field [0001] The present invention relates to the field of purification and impurity removal of waste power battery leachate, in particular, to a method for removing fluorine from the leachate of positive electrode materials of lithium-ion batteries and its application, more specifically, to a method for removing fluorine from leachate of positive electrode materials of lithium-ion batteries and to the positive electrode of lithium-ion batteries A method for recovering nickel, cobalt and manganese from materials. Background technique [0002] Power lithium batteries are composed of positive and negative electrode materials, current collectors, electrolytes (usually LiPF 6 ), binder PVDF and other components, the electrolyte, binder PVDF or the fluoride used in the modification of positive electrode materials contain a certain amount of F element. After the positive electrode material is leached by acid, a large amount of impurity F elements will enter the leach so...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B15/00C22B21/00C22B26/12C22B47/00C22B23/00C22B3/06C22B3/44
CPCC22B7/007C22B7/006C22B3/06C22B3/44C22B26/12C22B23/0461C22B47/00C22B21/0023C22B15/0067C22B15/0089Y02P10/20
Inventor 王海北邓超群李诗丽秦树辰郑朝振李强邹小平
Owner BEIJING MINING & METALLURGICAL TECH GRP CO LTD
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