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Recycling method of positive electrode material of waste lithium cobalt oxide battery

A battery cathode and recycling method technology, applied in battery recycling, waste collector recycling, recycling technology, etc., can solve the problems of evaporative crystallization, complex process, unreasonable reaction engineering, etc., to improve the conversion rate and recovery rate , the overall cost reduction, the effect of short process flow

Pending Publication Date: 2021-06-18
中节能工程技术研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the process of this method is complicated. After all the metals are leached into the solution to remove impurities, the impurity metals will sink into the slag, which is unreasonable from the perspective of reaction engineering; at the same time, obtaining cobalt sulfate and lithium sulfate mixed salt requires evaporation and crystallization, which can The consumption is high, and the value of cobalt sulfate and lithium sulfate mixed salt is not high, and metal resources have not been rationally utilized
[0005] Existing related technology 2 uses a combination of fire and wet methods to reduce and roast the positive electrode material to transform lithium in advance, and then selectively recover lithium through water quenching. This process is simple and the recovery rate of lithium is high, but the roasting temperature is high and energy consumption is high. Big
[0006] Existing related technology 3 oxidizes the positive electrode material and the oxidant under high temperature conditions to separate the lithium element. This process uses an oxidation method to break the lithium cobaltate lattice, which requires a lot of energy and high energy consumption, and the use of the oxidant To some extent, there are security risks

Method used

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Experimental program
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Effect test

Embodiment 1

[0037] Take 100g of the positive and negative electrode mixture of lithium cobalt oxide battery (the negative electrode material accounts for 35%), add 42g of ammonium chloride, mechanically activate for 20min, reduce and roast at 500°C, control the CO atmosphere, and react for 3h;

[0038] Add 800ml of water to the roasted product, soak lithium at room temperature for 1.5h, the leaching rate of lithium is 98.46%, and other metals are not dissolved, filter to obtain a lithium-rich solution, the recovery rate of lithium is 96.2%;

[0039] Inject CO into the Li-rich solution 2 , CO 2 The feed rate was 1.5 L / min, reacted at 60°C for 2 hours, and filtered to obtain lithium carbonate with a purity of 99.32% and a lithium precipitation rate of 95.8%.

Embodiment 2

[0041] Take 100g of the positive and negative electrode mixture of lithium cobaltate battery (the negative electrode material accounts for 38%), add 20g of ammonium sulfate, mechanically activate for 10min, reduce and roast at 580°C, control the CO atmosphere, and react for 1.5h;

[0042] Add 600ml of water to the roasted product, soak lithium at room temperature for 2 hours, the leaching rate of lithium is 98.76%, and other metals are not dissolved, filter to obtain a lithium-rich solution, the recovery rate of lithium is 97.8%;

[0043] Inject CO into the Li-rich solution 2 , CO 2 The feed rate was 1 L / min, reacted at 40°C for 2 hours, and filtered to obtain lithium carbonate with a purity of 99.65% and a lithium precipitation rate of 96.4%.

Embodiment 3

[0045]Take 100g of the positive and negative electrode mixture of lithium cobalt oxide battery (the negative electrode material accounts for 45%), add 30g of sodium phosphate, mechanically activate for 15min, reduce and roast at 600°C, control the CO atmosphere, and react for 1h;

[0046] Add 1000ml of water to the roasted product, soak lithium at room temperature for 2 hours, the leaching rate of lithium is 98.34%, and other metals are not dissolved, filter to obtain a lithium-rich solution, the recovery rate of lithium is 95.8%;

[0047] Inject CO into the Li-rich solution 2 , CO 2 The feed rate was 1.5 L / min, reacted at 50°C for 1.5 h, and filtered to obtain lithium carbonate with a purity of 99.27% ​​and a lithium precipitation rate of 95.2%.

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Abstract

The invention provides a method for recycling a positive electrode material of a waste lithium cobalt oxide battery. The method comprises the following steps of adding a salt assistant and a reducing agent into the positive electrode material of the lithium cobalt oxide battery, roasting the obtained mixture in a reducing atmosphere, carrying out water leaching treatment on the roasted product, and carrying out solid-liquid separation to obtain a lithium-rich solution. According to the method, lithium in the positive electrode material of the lithium cobalt oxide battery can be efficiently transformed into water-soluble lithium salt at a relatively low temperature, effective separation of lithium from other components can be realized through water immersion treatment, and the method simplifies the production process, reduces the energy consumption and has potential industrial application value.

Description

technical field [0001] The invention relates to the technical field of lithium ion battery treatment, in particular to a method for recycling the positive electrode material of waste lithium cobalt oxide batteries. Background technique [0002] Lithium cobalt oxide batteries are mainly used as power sources for small portable electronic devices such as mobile phones and notebook computers. With the widespread application of portable electronic devices, the use of lithium cobalt oxide batteries is increasing year by year. The service life of lithium cobalt oxide batteries is generally 2 to 3 years. Waste of metal resources. Therefore, it is of great significance to recycle waste lithium cobalt oxide batteries. [0003] At present, the recycling methods of lithium cobalt oxide batteries are roughly divided into two categories: fire recycling and wet recycling. Among them, lithium is mainly enriched in the two phases of slag and soot in the pyroprocessing process, and exists...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B1/02C22B26/12C22B23/00H01M10/54C01D15/08
CPCC22B7/006C22B1/02C22B26/12C22B23/0407C22B23/0461H01M10/54C01D15/08Y02W30/84Y02P10/20
Inventor 周立杰刘风华邹结富邱明建陈士朝丁银贵张欣管子豪刘梦瑶
Owner 中节能工程技术研究院有限公司
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