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Method for recovering and preparing lithium cobaltate from waste lithium ionic cell

A technology of lithium ion battery and lithium cobalt oxide, which is applied in the field of preparation and recycling of lithium cobalt oxide, can solve the problems of high equipment requirements, secondary pollution, and a large amount of waste water, and achieves low raw material price, short reaction process and high added value of products. Effect

Active Publication Date: 2011-04-13
GUANGDONG BRUNP RECYCLING TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This type of method has a long process flow and high equipment requirements; a large amount of waste water is generated, which is easy to cause secondary pollution; and only cobalt is recovered, and valuable metals such as lithium and copper are not recovered.

Method used

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  • Method for recovering and preparing lithium cobaltate from waste lithium ionic cell
  • Method for recovering and preparing lithium cobaltate from waste lithium ionic cell
  • Method for recovering and preparing lithium cobaltate from waste lithium ionic cell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 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 12.6g, and the total weight of the undersize is 87.4g; detected by the atomic absorption instrument, the aluminum content in the oversize is 73.8%, and the cobalt content is 12.3%; the aluminum content in the undersize is 0.8%, containing The amount of cobalt is 53.1%. Therefore, it is calculated that the aluminum removal rate is 93.0%, and the cobalt loss caused by the cobalt contained in the aluminum slag of the sieve is 3.2%.

Embodiment 2

[0025] 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 44.5 g. The CS800 infrared carbon and sulfur detector was used to detect that the carbon content was about 0.02%, indicating that the binder and acetylene black were basically removed completely. Take 20g of the burning residue and put it into a 500mL beaker, add 100mL of 0.2mol / L sodium hydroxide, put the beaker into a constant temperature water bath, adjust the temperature to 65°C, keep stirring with a magnetic stirrer, react for 40min, filter, and pass through After repeated washing with distilled water to neutrality, put it into an oven and dry it at 150°C for 12 hours. After grinding and pulverizing, waste lithium cobaltate was obtained, weighing 19.8g. ICP is used to detect that the aluminum content is 0.01%, that is, the aluminum is basically completely ...

Embodiment 3

[0027] Take 15g of waste lithium cobaltate in Example 2, add 0.7g of battery-grade lithium carbonate, fully grind and mix the above-mentioned raw materials in an agate mortar, put them into a corundum crucible, and sinter at a high temperature in a muffle furnace to obtain The temperature was raised to 750°C at a rate of 2°C / min, kept at a constant temperature for 15 hours, and then slowly lowered to room temperature at a rate of 1°C / min to prepare lithium cobaltate. The XRD and SEM characterization results are shown in the appendix figure 1 with attached figure 2 . figure 1 It shows that its impurity content is low and its crystal structure is complete; and the average particle size of the particles is 7.0μm, and its specific surface area is 0.52m after testing 2 / g, the tap density is 2.21g / cm 3 .

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Abstract

The invention discloses a method for reclaiming and preparing lithium cobalt oxide from waste lithium ion batteries. The method is characterized in that the waste lithium batteries are disassembled and the shells are removed to select positive plates with the anode made of lithium cobalt oxide; the positive plates are crushed and screened to obtain minus sieve containing waste lithium cobalt oxide as the main component; in a constant-temperature resistance furnace, caking agent and conductive agent acetylene black in the minus sieve are removed in high temperature, sodium hydroxide is adoptedto remove aluminum, and filtering, washing and drying are performed to obtain inactive lithium cobalt oxide containing little impurity; the content of lithium and cobalt is detected in the inactive lithium, then lithium carbonate with proper proportion is mixed in, at last, active lithium cobalt oxide battery material is synthesized by high-temperature agglomeration in a muffle furnace. Through the application of the method, the coefficient of recovery of cobalt in waste lithium ion batteries can reach more than 95.0 percent, and the coefficient of recovery of lithium can reach more than 97.0percent.

Description

technical field [0001] The invention belongs to the field of battery materials, and more specifically relates to a method for recovering and preparing lithium cobaltate from waste lithium ion batteries. Background technique [0002] Lithium-ion batteries have been widely used since their commercialization due to their high energy density, light weight, long life and no memory. According to the statistics of the Ministry of Information Industry, the number of mobile phone users in my country has grown very rapidly. By the end of March 2007, there were 480 million mobile phone users, and the number of new users increased by more than 6 million per month. It has become the largest mobile communication country in the world; It is also one of the world's largest producers and consumers of digital products such as notebook computers. Cell phone batteries, MP3 rechargeable batteries and notebook computer power supplies are mainly lithium-ion batteries, and their average lifespan is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/54C01D15/00C01G51/00
CPCY02W30/84
Inventor 李长东黄国勇徐盛明
Owner GUANGDONG BRUNP RECYCLING TECH
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