Method for recovering valuable metals from positive electrode material of waste lithium ion battery

A lithium-ion battery and positive electrode material technology, applied in the field of recycling valuable metals, can solve the problems of large environmental risks, solid waste water, large consumption of acid and alkali, etc., achieve high industrial application prospects, reduce recycling costs, and high recovery rate Effect

Active Publication Date: 2018-11-06
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main disadvantage of this process is that the amount of ammonium sulfate required for roasting is large; and the recovery is difficult, so acid leaching is required in the future, which will increase the alkali consumption of the system
However, the whole process does not treat the roasting flue gas and the solid w

Method used

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  • Method for recovering valuable metals from positive electrode material of waste lithium ion battery
  • Method for recovering valuable metals from positive electrode material of waste lithium ion battery

Examples

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Effect test

Embodiment 1

[0046] A kind of method of the present invention reclaims valuable metal from waste lithium ion battery anode material lithium cobalt oxide, comprises the following steps:

[0047] (1) Discharge the lithium cobaltate lithium-ion waste battery with 100g / L salt water; disassemble and remove the metal casing (or soft case), and separate the positive electrode sheet, negative electrode sheet, diaphragm, and electrolyte; the obtained positive electrode sheet Carry out crushing and sieving to separate aluminum foil and positive electrode material.

[0048] (2) Separate the positive electrode material and ammonium bisulfate according to n((NH 4 ) HSO 4 ) / n(Co+2Li)=1.1 (molar ratio) and mixed in a tube furnace, the temperature of the calcination is 500° C., and the calcination time is 1 h.

[0049] (3) Crush the obtained roasted material, use pure water (or tap water) to prepare the slurry according to the liquid-solid ratio of 3:1ml / g, and stir and leaching for 30 minutes in a wate...

Embodiment 2

[0055] A method of reclaiming valuable metals from waste lithium ion battery cathode material lithium manganate of the present invention comprises the following steps:

[0056] (1) Use 100g / L salt water to discharge lithium manganate lithium-ion waste batteries; disassemble and remove the metal casing (or soft case), and separate the positive electrode sheet, negative electrode sheet, diaphragm, and electrolyte; the obtained positive electrode sheet Crushing and sieving are carried out to separate aluminum foil and positive electrode material.

[0057] (2) The obtained positive electrode material is mixed with ammonium bisulfate according to n((NH 4 ) HSO 4 ) / n(Mn+2Li)=1.2, and roasted in a tube furnace, the temperature of the roasting is 500° C., and the roasting time is 1 h.

[0058] (3) Crush the obtained roasted material, use pure water (or tap water) to prepare the slurry according to the liquid-solid ratio of 3:1ml / g, and stir and leaching for 30 minutes in a water bat...

Embodiment 3

[0063] A method for recovering valuable metals from the ternary material of the positive electrode material of the waste lithium-ion battery according to the present invention, the process flow chart is as follows figure 1 shown, including the following steps:

[0064] (1) Discharge the waste nickel-cobalt-manganese ternary lithium-ion battery with 100g / L salt water, disassemble and remove the metal casing (or soft casing), and separate the positive electrode sheet, negative electrode sheet, diaphragm, and electrolyte. The obtained positive electrode sheet is crushed, and the aluminum foil and the positive electrode material are screened out.

[0065] (2) The obtained positive electrode material is mixed with ammonium bisulfate according to n((NH 4 ) HSO 4 ) / n(Ni+Co+Mn+2Li)=1.3, and roasted in a tube furnace, the temperature of the roasting is 550° C., and the roasting time is 2 hours.

[0066] (3) Crush the obtained roasted material, use pure water (or tap water) to prepar...

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Abstract

The invention provides a simple, efficient and environment-friendly method for recovering valuable metals from a positive electrode material of a waste lithium ion battery; the method comprises the following steps of performing discharging of a salt solution; performing disassembling to separate a positive plate; performing smashing on the positive plate to separate a positive electrode material and an aluminum foil; performing mixed low-temperature roasting on the positive electrode material and a roasting agent ammonium sulfate and/or ammonium bisulfate; performing leaching on the roasted material and separating to obtain carbon and a lixivium; adding a precipitant into the lixivium, and regulating the pH value by using NH<3>-containing flue gas, performing deposition on other metals except Li, and carrying out solid-liquid separation; regulating the pH value of a filtrate by using the NH3-containing flue gas, adding ammonium carbonate or ammonium bicarbonate or pumping CO<2> gas, and carrying out lithium precipitation to obtain a lithium carbonate product. The preparation process is simple, the process conditions are mild, the time required by the process is short, a large amount of acid and alkali do not need to be consumed, and the cost is low; and in addition, recovery of the valuable metals and carbon from the positive electrode material can be effectively realized, themethod is green and environment-friendly, and a large amount of solid waste and wastewater cannot be generated.

Description

technical field [0001] The invention relates to the field of electronic solid waste treatment and recycling, and relates to a method for recovering valuable metals from waste lithium-ion battery cathode materials. Background technique [0002] Currently, due to LiNi x co y mn 1-x-y o 2 The battery positive electrode active material contains a large amount of important rare metal resources such as Li, Co, Ni, Mn, etc., so waste LiNi x co y mn 1-x-y o 2 The recycling of cathode active materials has attracted worldwide attention. LiCoO for the first generation of lithium-ion batteries 2 As an anode material, while recycling LiCoO 2 Extensive research has been conducted on spent Li-ion batteries as cathode materials. However, most of the widely used cathode materials for lithium-ion batteries are LiCoO 2 , LiMn 2 o 4 , LiNiO 2 、LiNi x mn y co 1-x-y o 2 , and LiFePO 4 Mainly. The price of cathode materials is the most expensive part of each component of lithiu...

Claims

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Application Information

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IPC IPC(8): H01M10/54C22B1/06C22B7/00
CPCC22B1/06C22B7/001C22B7/006H01M10/54Y02W30/84Y02P10/20
Inventor 何仕超刘志宏夏隆巩刘智勇李启厚朱银黄辉高禄鹏
Owner CENT SOUTH UNIV
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