Methods for leaching valuable metals from waste lithium ion ternary positive electrode material and preparing ternary positive electrode material precursor

A cathode material, lithium ion technology, applied in the field of preparation of ternary cathode material precursor, can solve the problems of increasing economic cost and environmental pressure, increasing the difficulty of wastewater treatment, corrosion of production equipment, etc., to avoid secondary solid waste and wastewater , cost reduction and low acid consumption

Pending Publication Date: 2020-06-26
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to ensure the full recovery of valuable metals, excessive sulfuric acid and additional reducing agents need to be added in the recovery process, which has a strong corrosion effect on production equipment, and increases the difficulty of wastewater treatment, increasing economic costs and environmental pressure
[0005] It is also disclosed in the technical literature that after the electrode material is crushed, it is mixed with concentrated sulfuric acid, etc., and the secondary heat treatment is carried out at a high temperature (above 350°C) in the electric furnace, so that the metals such as cobalt, copper and lithium in t

Method used

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  • Methods for leaching valuable metals from waste lithium ion ternary positive electrode material and preparing ternary positive electrode material precursor
  • Methods for leaching valuable metals from waste lithium ion ternary positive electrode material and preparing ternary positive electrode material precursor
  • Methods for leaching valuable metals from waste lithium ion ternary positive electrode material and preparing ternary positive electrode material precursor

Examples

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Example Embodiment

[0042] Example 1:

[0043] A method of the present invention for leaching valuable metals from waste lithium ion ternary positive electrode materials and preparing the leaching solution into a ternary positive electrode material precursor, the process flow chart is as follows figure 1 As shown, the specific steps are as follows:

[0044] (1) Put the waste ternary lithium-ion battery into 120g / L salt water for discharge treatment, disassemble and remove the shell, separate the positive electrode sheet, negative electrode sheet, diaphragm, and electrolyte; then put the positive electrode active material on the positive electrode sheet and the current collector Aluminum foil is separated, and the separated waste lithium-ion battery positive electrode active material is ball-milled to obtain powder;

[0045] (2) Mix the powder and water according to 1:0.4 (mass ratio) to make the powder wet;

[0046] (3) Add sulfuric acid with a concentration of 80% to the wet material to mix (t...

Example Embodiment

[0054] Example 2:

[0055] A method of the present invention for leaching valuable metals from waste lithium ion ternary positive electrode materials and preparing the leaching solution into a ternary positive electrode material precursor, the specific steps are as follows:

[0056] (1) Put the waste ternary lithium-ion battery into 120g / L salt water for discharge treatment, disassemble and remove the shell, separate the positive electrode sheet, negative electrode sheet, diaphragm, and electrolyte; then put the positive electrode active material on the positive electrode sheet and the current collector Aluminum foil is separated, and the separated waste lithium-ion battery positive electrode active material is ball-milled to obtain powder;

[0057] (2) Mix the powder and water according to 1:0.4 (mass ratio) to make the powder wet;

[0058] (3) Add sulfuric acid with a concentration of 98% to the wet material and mix it. The molar ratio of the powder material to the concentr...

Example Embodiment

[0065] Example 3:

[0066] A method of the present invention for leaching valuable metals from waste lithium ion ternary positive electrode materials and preparing the leaching solution into a ternary positive electrode material precursor, the specific steps are as follows:

[0067] (1) Put the waste ternary lithium-ion battery into 120g / L salt water for discharge treatment, disassemble and remove the shell, separate the positive electrode sheet, negative electrode sheet, diaphragm, and electrolyte; then put the positive electrode active material on the positive electrode sheet and the current collector Aluminum foil is separated, and the separated waste lithium-ion battery positive electrode active material is ball-milled to obtain powder;

[0068] (2) Mix the powder and water according to 1:0.6 (mass ratio) to make the powder wet;

[0069] (3) Add sulfuric acid with a concentration of 70% to the wet material and mix, the molar ratio of powder and concentrated sulfuric acid ...

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Abstract

The invention discloses a method for leaching valuable metals from a waste lithium ion ternary positive electrode material. The method comprises the following steps: carrying out ball milling on an active substance separated from the waste lithium ion battery positive electrode material to obtain powder; wetting the powder with water to obtain a wet material; mixing the wet material with concentrated sulfuric acid; roasting at low temperature to obtain a roasted material; and carrying out water leaching on the roasted material, and carrying out solid-liquid separation to obtain carbon and a metal leachate. According to the method for leaching the valuable metal, efficient leaching of the metal is achieved under the condition that no reducing agent or additive exists, and energy consumptionis reduced. The invention further discloses a method for adjusting the molar ratio of nickel to cobalt to manganese in the leachate, then adding the urea, mixing with the ethylene glycol and carryingout a hydrothermal reaction to prepare a ternary positive electrode material precursor, so that separation of different metals is avoided, valuable metals are effectively recycled, the process flow is shortened, the operation is simple, industrial production is facilitated, and the prepared ternary positive electrode material precursor has excellent electrochemical performance.

Description

technical field [0001] The invention belongs to a resource recovery method of waste batteries, in particular to a method for leaching valuable metals from waste lithium ion ternary positive electrode materials and preparing a precursor of ternary positive electrode materials. Background technique [0002] Since 1990, ternary lithium-ion batteries have the advantages of high operating voltage, high energy density, no memory effect, light weight, small size, low self-discharge rate, long cycle life, and wide operating temperature range. It has been widely used in portable electronic devices and electric vehicles. As demand continues to rise, it is estimated that by 2030, the worldwide processing capacity of waste lithium ions will exceed 11 million tons, and its processing capacity will usher in explosive growth. Lithium-ion batteries contain a large amount of valuable metals, and the metal content in some lithium-ion batteries is even higher than that of natural ores, which ...

Claims

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Application Information

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IPC IPC(8): C01G53/00H01M4/505H01M4/525H01M10/0525H01M10/54
CPCC01G53/006C01P2002/72C01P2004/03C01P2004/32C01P2006/40C01P2006/80H01M4/505H01M4/525H01M10/0525H01M10/54Y02E60/10Y02W30/84
Inventor 田庆华邹艾玲童汇郭学益
Owner CENT SOUTH UNIV
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