Method for preparing nickel and cobalt doped lithium manganate by using waste and old lithium ionic cell as raw material

A lithium-ion battery, nickel-cobalt lithium manganate technology, applied in the direction of manganate/permanganate, etc., can solve the problem of unsuitable disposal of waste lithium-ion batteries, and achieve high added value of products, short process flow, raw materials low price effect

Inactive Publication Date: 2009-06-10
GUANGDONG BRUNP RECYCLING TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The change of positive electrode materials makes the original process of treating waste lithium-ion batteries relatively inapplicable, and

Method used

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  • Method for preparing nickel and cobalt doped lithium manganate by using waste and old lithium ionic cell as raw material
  • Method for preparing nickel and cobalt doped lithium manganate by using waste and old lithium ionic cell as raw material
  • Method for preparing nickel and cobalt doped lithium manganate by using waste and old lithium ionic cell as raw material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] After the polymer lithium-ion battery was disassembled, 100 g of the positive electrode sheet was selected and crushed with a vertical high-speed rotary grinder. The crushing time was set at 5 minutes. After crushing, it was sieved with an 80-mesh standard sieve. The total weight of the oversize is 11.3g, and the total weight of the undersize is 88.7g; detected by the atomic absorption instrument, the aluminum content in the oversize is 81.4%, and the total content of nickel, cobalt and manganese is about 5.50%; the aluminum content of the undersize is 0.9%, the cobalt content is 18.5%, the nickel content is 18.0%, and the manganese content is 16.9%. Therefore, the aluminum removal rate is calculated to be 92.0%, and the total loss of nickel, cobalt, and manganese caused by the positive electrode material contained in the aluminum slag on the sieve is 1.3%.

Embodiment 2

[0030]Take 50 g of the undersize in Example 1, put it into a high-temperature electric furnace, keep the air circulation, raise the temperature to 600 ° C, keep the temperature for 4 hours, and the burnt residue weighs 45.1 g. The CS800 infrared carbon and sulfur detector was used to detect that the carbon content was about 0.01%, indicating that the binder and acetylene black were basically completely removed. Take 40g of the burning residue and put it into a 500mL beaker, add 150mL of sodium hydroxide with a concentration of 0.2mol / L, the amount of sodium hydroxide is twice the theoretical value, put the beaker into a constant temperature water bath, and adjust the temperature to 65°C. Keep stirring with a magnetic stirrer, react for 40 minutes, and filter. The obtained filter residue is washed with distilled water several times until it becomes neutral, and then put in an oven and dried at 150°C for 12 hours. After grinding and pulverizing, the waste positive electrode mater...

Embodiment 3

[0032] Get waste positive electrode material 35.0g among the embodiment 2 and put into beaker, add concentration and be the sulfuric acid 210ml of 4.0mol / L, wherein contain 40ml hydrogen peroxide solution (H 2 o 2 content is 30%), put the beaker into a constant temperature water bath, adjust the temperature to 90°C, keep stirring with a magnetic stirrer, after reacting for 60min, filter to remove the filter residue, and set the filtrate to a constant volume of 500ml. EDTA complexometric titration, flame atomic absorption spectrometry and plasma emission spectrometry (ICP) are used to detect the metal element content in the leachate as follows:

[0033]

[0034] After calculation, the leaching rates of nickel, cobalt and manganese are 99.0%, 99.5% and 99.8% in sequence.

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Abstract

The invention discloses a method for preparing lithium nickel cobalt manganese oxide by taking a waste lithium ion battery as a raw material. The method is mainly characterized in that a waste lithium ion battery taking the lithium nickel cobalt manganese oxide, lithium nickel cobalt oxide and so on as a battery positive material is selected as the raw material and is pretreated through disassembly, separation, crushing, screening and so on, and then processes such as adhesive removal at high temperature and aluminum removal by sodium hydroxide are adopted to obtain an inactivated positive material containing nickel, cobalt and manganese; then a sulfuric acid and hydrogen peroxide system is adopted to leach, and P204 is adopted to remove impurities by extraction to obtain pure nickel, cobalt and manganese solution, and proper manganese sulfate, nickel sulfate or cobalt sulfate is blended to ensure that the mol ratio of nickel, cobalt and manganese elements in the solution is 1: 1: 1; and then ammonium carbonate is adopted to adjust the pH value to form a nickel cobalt manganese carbonate precursor, and then a proper amount of lithium carbonate is blended for high temperature sintering to synthesize a lithium nickel cobalt manganese oxide battery material. The first discharge capacity of the material is 150 mAh/g, the discharge capacity is still kept more than 130mAh/g after the circulation for 30 times, and the material has good electrochemical performance.

Description

technical field [0001] The invention belongs to the field of battery materials, and more specifically relates to a method for preparing nickel-cobalt lithium manganese oxide by using waste lithium-ion batteries as raw materials. Background technique [0002] The widespread application of portable electronic products such as mobile phones, notebook computers, digital cameras, and electric tools in the market has driven the rapid development of the lithium-ion battery industry. Although lithium cobalt oxide is still the most widely used cathode material for lithium-ion batteries, the soaring price of cobalt in recent years has led battery manufacturers to gradually adopt Ni-Co, Co-Mn, Mn-Ni, Mn-Ni-Co and other mixed materials. The oxide system replaces lithium cobalt oxide, and its market share is increasing, so that the proportion of mixed oxide systems used in scrapped lithium-ion batteries will also increase significantly year by year. [0003] At present, the traditional ...

Claims

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Application Information

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IPC IPC(8): C01G45/12
Inventor 李长东黄国勇徐盛明
Owner GUANGDONG BRUNP RECYCLING TECH
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