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Recycled product and recycling method of waste lithium cobalt oxide battery

A recycling method, lithium cobalt oxide technology, applied in battery recycling, waste collector recycling, recycling technology, etc., can solve the problems of increased recycling cost, no cost advantage, long leaching time, etc., and achieve low production cost and simple operation , good effect of crystal integrity

Pending Publication Date: 2021-08-24
HUNAN SHANSHAN ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this recovery method is not efficient in large-scale production and has no advantage in cost. In order to pursue a higher metal leaching rate, it is not only necessary to add hydrogen peroxide for reduction, but also requires a long leaching time. At the same time, in order to remove cobalt from the leaching solution Separation from the medium, whether it is extracted or added to the alkali reaction, the recovery cost will be greatly increased

Method used

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  • Recycled product and recycling method of waste lithium cobalt oxide battery
  • Recycled product and recycling method of waste lithium cobalt oxide battery
  • Recycled product and recycling method of waste lithium cobalt oxide battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A kind of recovery method of waste lithium cobalt oxide battery of the present invention, comprises the following steps:

[0032] (1) Fully discharge the lithium cobalt oxide battery discarded from a recycling company in Dongguan City, Guangdong Province in a 1mol / L sodium chloride solution, and disassemble it to obtain the positive electrode sheet, which is placed in a 2mol / L sodium hydroxide solution The aluminum foil was removed, washed several times, dried, and then calcined in a muffle furnace at a calcination temperature of 400°C for 6 hours to remove impurities such as carbon and PVDF in the positive electrode material. After grinding and sieving, the positive electrode powder was obtained. The element content is shown in Table 1. Show;

[0033] Table 1 Elemental composition content of positive electrode powder

[0034]

[0035] (2) Weigh 200g of the positive electrode powder obtained in step (1) and place it in a beaker. According to the stoichiometric ratio...

Embodiment 2

[0040] A kind of recovery method of waste lithium cobalt oxide battery of the present invention, comprises the following steps:

[0041] (1) Take the same waste battery as in Example 1 and fully discharge it in a 2mol / L potassium chloride solution, disassemble it to obtain the positive electrode sheet, then place the positive electrode sheet in a 2mol / L potassium hydroxide solution to remove the aluminum foil, and wash it several times After drying, it was calcined in a muffle furnace to 500°C and held for 6 hours to remove impurities such as carbon and PVDF in the positive electrode material. After grinding, it was sieved to obtain the positive electrode powder. The element content is shown in Table 2;

[0042] The element composition content of table 2 positive electrode powder

[0043]

[0044] (2) Weigh 200g of the positive electrode powder obtained in step (1) and place it in a beaker. According to the stoichiometric ratio of the positive electrode material and sulfuri...

Embodiment 3

[0049] A kind of recovery method of waste lithium cobalt oxide battery of the present invention, comprises the following steps:

[0050] (1) Get the same waste battery sample of Example 1 and fully discharge it in 2mol / L Potassium Chloride Solution, then disassemble it to obtain the positive electrode sheet, then place the positive electrode sheet in 2mol / L Potassium Hydroxide Solution to remove the aluminum foil. After washing for the first time, it was dried, and then placed in a muffle furnace for calcination at 500°C for 8 hours to remove impurities such as carbon and PVDF in the positive electrode material. After grinding and sieving, the positive electrode powder was obtained. The element content is shown in Table 3;

[0051] Table 3 Elemental composition content of positive electrode powder

[0052]

[0053] (2) Weigh 200g of the positive electrode powder obtained in step (1) and place it in a beaker, and add an excess of 30% of 1.75mol / L HNO according to the stoichi...

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Abstract

The invention discloses a recycled product of a waste lithium cobalt oxide battery, which is mainly composed of 98.1 wt%-99.0 wt% of Co3O4 and 1.0 wt%-1.8 wt% of LiXCoyO2, x is more than or equal to 0.8 and less than or equal to 1.0, and y is more than or equal to 0.7 and less than or equal to 1.0. The invention further discloses a recycling method of the waste lithium cobalt oxide battery. The recycling method comprises the following steps: pretreating the waste lithium cobalt oxide battery to obtain positive electrode powder; dissolving and leaching the positive electrode powder by adopting an acid leaching agent, stopping leaching when the leaching rate of Co reaches 10-40% and the leaching rate of Li reaches 88-99%, and filtering to obtain a filter cake and filtrate; and drying and calcining the filter cake to obtain a recycled product. According to the recycling method, the leaching rates of Co and Li are monitored, when the leaching rates of Co and Li reach the target range, the leaching step is immediately ended, and a ceramic-grade cobaltosic oxide recycling product is obtained through one-step sintering.

Description

technical field [0001] The invention belongs to the technical field of recovery of waste lithium batteries, and in particular relates to a method for recovering ceramic-grade cobalt trioxide from waste lithium cobalt oxide batteries and the obtained recovered products. Background technique [0002] Since the successful commercialization of lithium cobalt oxide batteries at the end of the 20th century, they have the advantages of high energy density, high working voltage, no memory effect, high charge and discharge efficiency, and long working life. Batteries are widely used in mobile electronics. However, after lithium-ion batteries have undergone multiple charge-discharge cycles, the active materials will be deactivated and scrapped due to structural changes. Therefore, the number of waste lithium cobalt oxide batteries is increasing year by year and the amount of scrapping is huge. In 2025, 125.6GWh will be decommissioned. [0003] Discarded lithium cobalt oxide batterie...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/54C01G51/04
CPCH01M10/54C01G51/04Y02W30/84
Inventor 郝涛陈九华胡进
Owner HUNAN SHANSHAN ENERGY TECH CO LTD