Process for selectively extracting valuable metals in waste power lithium battery and repreparing ternary positive electrode material

A cathode material and valuable metal technology, which is applied in the field of effective recovery of valuable metals from waste batteries, can solve problems such as pollution and low cost, and achieve the effects of solving resource shortages, saving recycling costs, and avoiding secondary pollution.

Inactive Publication Date: 2019-12-27
SHAANXI UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to solve the above technical problems, the purpose of the present invention is to provide a process for the selective extraction of valuable metals in waste power lithium batteries and the re-preparation of ternary positive electrode materials, and the method of combining leaching and material repair can effectively realize short-range coupling selection. A new method for lithium extraction and positive electrode material repair and regeneration, which can realize the resource utilization of metals and solve the problem of harmful waste pollution with low cost

Method used

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  • Process for selectively extracting valuable metals in waste power lithium battery and repreparing ternary positive electrode material
  • Process for selectively extracting valuable metals in waste power lithium battery and repreparing ternary positive electrode material
  • Process for selectively extracting valuable metals in waste power lithium battery and repreparing ternary positive electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] (1) Discharge, disassemble, ultrasonic stripping and calcination to obtain the required positive electrode material (LiNi 1 / 3 mn 1 / 3 CoO 2 ).

[0037](2) Weigh the required ternary materials, put them into a three-necked flask, use a water bath to control the reaction temperature, add the required acid content and hydrogen peroxide, and start timing. The concentration of oxalic acid is 0.2mol / L, the temperature is 40°C, the time is 20min, the hydrogen peroxide is 1vol.%, the liquid-solid ratio is 20mL / g, and the stirring speed is 400rpm, and the Li-containing supernatant and nickel-cobalt-manganese precipitate will be obtained. of the suspension.

[0038] (3) Filter the suspension obtained above using a vacuum filter, and repeatedly rinse the precipitate with distilled water 3 times to obtain the precipitate and leachate respectively, dry the obtained precipitate in an oven at 80°C for 10 hours, and then Grind and store in an agate mortar, record the volume of the s...

Embodiment 2

[0043] (1) Discharge, disassemble, ultrasonic stripping and calcination to obtain the required positive electrode material (LiNi 1 / 3 mn 1 / 3 COO 2 ).

[0044] (2) Design a single factor experiment for oxalic acid leaching ternary materials, weigh the required ternary materials, put them into a three-necked flask, use a water bath to control the reaction temperature, add the required acid content and hydrogen peroxide, and start timing. Wherein the acid concentration is 0.5mol / L, the temperature is 50°C, the time is 30min, the hydrogen peroxide is 3vol.%, and the liquid-solid ratio is 40mL / g, a supernatant containing Li and a suspension containing nickel, cobalt and manganese precipitates will be obtained.

[0045] (3) Filter the suspension obtained above using a vacuum filter, and repeatedly rinse the precipitate with distilled water 3 times to obtain the precipitate and leachate respectively, dry the obtained precipitate in an oven at 80°C for 10 hours, and then Grind and s...

Embodiment 3

[0050] (1) Discharge, disassemble, ultrasonic stripping and calcination to obtain the required positive electrode material (LiNi 1 / 3 mn 1 / 3 COO 2 ).

[0051] (2) Design a single factor experiment for oxalic acid leaching ternary materials, weigh the required ternary materials, put them into a three-necked flask, use a water bath to control the reaction temperature, add the required acid content and hydrogen peroxide, and start timing. The acid concentration is 1.0mol / L, the temperature is 80°C, the time is 60min, the hydrogen peroxide is 5vol.%, and the liquid-solid ratio is 60mL / g, and a suspension containing Li-containing supernatant and nickel-cobalt-manganese precipitate will be obtained.

[0052] (3) Filter the suspension obtained above using a vacuum filter, and repeatedly rinse the precipitate with distilled water 3 times to obtain the precipitate and leachate respectively, dry the obtained precipitate in an oven at 80°C for 10 hours, and then Grind and store in an a...

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Abstract

The invention discloses a process for selectively extracting valuable metals in a waste power lithium battery and repreparing a ternary positive electrode material. The method comprises the followingsteps: (1) carrying out complete discharge, disassembly, ultrasonic stripping, calcination and grinding treatment on a recycled waste lithium battery to obtain a required LiNi1/3Mn1/3CoO2 positive electrode material; (2) leaching the LiNi1/3Mn1/3CoO2 positive electrode material through a wet metallurgy method by using mild acid and reducing agent, wherein the ratio of the positive electrode material to the added acid is controlled to be 20-60 mL/g, so as to obtain a leaching solution rich in lithium and a precipitate containing nickel-cobalt-manganese; (3) leaching the precipitate again by using a trace amount of acid and reducing agent, wherein the ratio of the precipitate to the added acid is controlled to be 20-60mL/g to obtain a metal-rich salt solution; and (4) carrying out coprecipitation on the metal salt solution to obtain a ternary precursor, adding excessive 3-10% of a lithium source according to the amount of substance of the precursor, and calcining the material at a selected temperature to obtain the ternary positive electrode material with good electrochemical performance. According to the method, metal resource utilization can be achieved, the problem of harmful garbage pollution is solved, and the cost is low.

Description

technical field [0001] The invention relates to the technical field of effective recovery of valuable metals from waste batteries, in particular to a process for selectively extracting valuable metals from waste power lithium batteries and re-preparing ternary positive electrode materials. Background technique [0002] With the rapid development of science and technology, lithium-ion batteries are widely used in people's lives because of their high energy and relatively long life. Quantity produced. The metals contained in lithium-ion batteries are all harmful metals, which have non-negligible pollution to the environment and ecology. Currently, effective recycling of these metals such as manganese, nickel, cobalt, and lithium can not only effectively alleviate environmental pollution, but also can be recycled. To solve the problem of resource shortage, the garbage classification currently carried out in China has more effectively promoted the recycling and reuse of used ba...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G53/00H01M4/505H01M4/525H01M10/0525H01M10/54H01M4/02
CPCC01G53/50H01M4/505H01M4/525H01M10/0525H01M10/54H01M2004/028Y02E60/10Y02W30/84
Inventor 陈湘萍康铎之
Owner SHAANXI UNIV OF SCI & TECH
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