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Method for recycling and synthesizing zinc-doped ternary material precursors from waste lithium batteries

A technology of waste lithium batteries and ternary materials, which is applied in the field of ternary material precursors, can solve the problems of impurity metals that cannot be removed, and achieve the effect of increasing added value and reducing process flow

Active Publication Date: 2019-11-15
TIANQI LITHIUM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method uses a high-temperature roasting method to recover the positive electrode material, which cannot remove impurity metals, and also cannot directionally obtain a single metal element doping, especially a single zinc-doped ternary material

Method used

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  • Method for recycling and synthesizing zinc-doped ternary material precursors from waste lithium batteries
  • Method for recycling and synthesizing zinc-doped ternary material precursors from waste lithium batteries
  • Method for recycling and synthesizing zinc-doped ternary material precursors from waste lithium batteries

Examples

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Effect test

Embodiment 1

[0043] A method for recovering and synthesizing zinc-doped ternary material precursors from waste lithium batteries includes the following steps:

[0044] 1. The composition of the acid leaching solution of the anode material of the waste lithium battery is shown in Table 1. Adjust the pH to 4 with 5% NaOH solution, add iron powder with 3 times the Cu content, stir for 0.5h at 150rpm, and then add 1.2 according to the amount of iron powder The hydrogen peroxide solution can be stirred at the same rate for 0.5-1h to remove other doping elements.

[0045] Table 1 (Unit: g / L)

[0046] Mn Ni CoSO 4 2-

Na +

Li +

Al FeCu Zn Pb Si 12.9214.3623.08366.40.0385.332.110.440.0600.09400.038

[0047] 2. The components of the acid leaching solution after removing other doping elements are shown in Table 2. Take 200mL of the acid leaching solution after removing impurities, and add 8.15g NiSO 4 .6H 2 O and 5.58g MnSO 4 .H 2 O, prepared into a solution with a molar ratio of Ni, Co, and Mn of ...

Embodiment 2

[0056] A method for recovering and synthesizing zinc-doped ternary material precursors from waste lithium batteries includes the following steps:

[0057] 1. The composition of the acid leaching solution for the anode material of the waste lithium battery is shown in Table 4. Adjust the pH to 4 with 5% NaOH solution, add iron powder with 3 times the Cu content, stir for 0.5h at 150rpm, and then add 1.2 according to the amount of iron powder It can remove other doping elements after stirring the reaction at the same rate for 0.5h.

[0058] Table 4 (Unit: g / L)

[0059] Mn Ni CoSO 4 2-

Na +

Li +

Al FeCu Zn Pb Si 12.9214.3623.08366.40.0385.332.110.440.0600.09400.038

[0060] 2. The components of the acid leaching solution after removing other doping elements are shown in Table 5. Take 200mL of the acid leaching solution after impurity removal, and add 36.14g NiSO 4 .6H 2 O and 11.58g MnSO 4 .H 2 O, prepared into a solution with a molar ratio of Ni, Co, and Mn of 5:2:3.

[0061] T...

Embodiment 3

[0069] A method for recovering and synthesizing zinc-doped ternary material precursors from waste lithium batteries includes the following steps:

[0070] 1. The composition of the acid leaching solution of the anode material of the waste lithium battery is shown in Table 7. Adjust the pH to 5 with 5% NaOH solution, add iron powder with 4 times the Cu content and stir for 0.5h at 150rpm, and then add 1.4 according to the amount of iron powder. The hydrogen peroxide can be stirred at the same rate to remove other doping elements.

[0071] Table 7 (Unit: g / L)

[0072] Mn Ni CoSO 4 2-

Na +

Li +

Al FeCu Zn Pb Si 12.9214.3623.08366.40.0385.332.110.440.0600.09400.038

[0073] 2. The components of the acid leaching solution after removing other doping elements are shown in Table 8. Take 200mL of the acid leaching solution after removing impurities and add 8.41g NiSO 4 .6H 2 O, 6.08g MnSO 4 .H 2 O and 0.1gZnSO 4 , Formulated into a solution with a molar ratio of Ni, Co, and Mn of 1:...

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Abstract

A waste lithium battery contains Zn, and after a ternary precursor is doped with Zn, interface stability of an electrode / electrolyte and the structural stability at high voltage can be improved, increase of charge transfer resistance during the cycle is inhibited, and Li<+> diffusion is facilitated. Therefore, the invention discloses a method for synthesizing a zinc-doped ternary material precursor from the waste lithium battery through recovery. The method comprises the following steps: removing doping elements except Zn from an acid leaching solution of a waste lithium battery cell crushingmaterial, adjusting the content of Ni, Co and Mn, synthesizing a doping material with a coprecipitation method, and performing precipitation, washing and drying to obtain the single zinc-doped ternarymaterial precursor. The single zinc-doped ternary material precursor is obtained while the ternary precursor is synthesized from the waste lithium battery through recovery; the method has the advantages of being simple in process flow, good in doping effect, cost-saving and capable of significantly improving electrochemical performance of the precursor and the like.

Description

Technical field [0001] The invention belongs to the field of battery materials, and in particular relates to a method for recovering and synthesizing zinc-doped ternary material precursors from waste lithium batteries. Background technique [0002] Nickel-cobalt-manganese ternary precursor, namely nickel-cobalt-manganese hydroxide (Ni x Co y Mn z (OH) 2 ), nickel cobalt manganese carbonate, oxalate and other compounds, mainly used for ternary cathode material lithium nickel cobalt manganese (LiNi x Co y Mn z O 2 )Synthesis. At present, ternary precursors are mainly synthesized by co-precipitation. Ternary cathode materials are synthesized by high-temperature sintering of ternary precursors and lithium hydroxide or lithium carbonate. They have the characteristics of large specific capacity, high energy density, good cycle performance, simple and feasible synthesis methods, and are currently mainly used in the power field. [0003] After the ternary cathode material is doped and mod...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/54
CPCH01M10/54Y02W30/84
Inventor 曹乃珍高洁肇巍谢宇充王梦李溢文徐川李仕红
Owner TIANQI LITHIUM CORP