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Method for feed-back compensation reproduction of invalid lithium cobalt oxide structure of cathode of lithium battery

A technology of lithium cobalt oxide and lithium battery is applied in the field of recycling and reuse of waste lithium batteries, which can solve the problems of inability to reduce the original form and size distribution of lithium cobalt oxide, limited improvement of electrochemical performance, inability to compare the performance of new batteries, etc. Achieve the effects of alleviating ecological pressure, easy migration, and increasing electrochemical specific capacity

Active Publication Date: 2019-12-03
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because the powdered lithium cobaltate is not dissolved, but the lithium is directly supplemented by ultrasonic, the supplement of lithium is limited, and the original shape and size distribution of the initial hexagonal layered structure of the lithium cobaltate crystal cannot be restored, resulting in the migration of lithium ions in the positive and negative electrodes. It will produce a certain impedance, so that the improvement of electrochemical performance is limited, and it cannot be compared with the performance of a new battery

Method used

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  • Method for feed-back compensation reproduction of invalid lithium cobalt oxide structure of cathode of lithium battery
  • Method for feed-back compensation reproduction of invalid lithium cobalt oxide structure of cathode of lithium battery
  • Method for feed-back compensation reproduction of invalid lithium cobalt oxide structure of cathode of lithium battery

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Embodiment 1

[0032] (1) Dismantling the waste lithium-ion battery first, soaking and discharging it in a sodium chloride solution to obtain the positive aluminum foil, and cutting it into pieces with a size of 3-5 cm. Place the positive electrode sheet in a solution of DMF and NMP = 1:3 (volume ratio), and soak in ultrasonic at a constant temperature of 80°C for 2 hours with a power of 100W. The positive electrode active material comes off, separates the aluminum foil, filters out the positive electrode active material, and dries in a vacuum at 100° C. to obtain the crude product of the positive electrode active material.

[0033] (2) Since some binders and carbon powder still remain in the rough product of the positive active material, the rough product of the positive active material obtained in step (1) is processed as follows: heating at a temperature of 700° C. for 5 hours, Grind after cooling. A treated positive electrode active material is obtained.

[0034] (3) Weigh 5g (about 0....

Embodiment 2

[0043] (1) The process of obtaining the treated positive electrode active material is the same as that of Example 1

[0044] (2) The positive active material was directly assembled into a button battery for testing. correspond figure 2 directly peeled off.

[0045] The preparation method and charge-discharge experiment of button cell are the same as embodiment 1, and the results are shown in figure 2 .

Embodiment 3

[0047] (1) The process of obtaining the treated positive electrode active material is the same as that of Example 1

[0048] (2) Weigh 5 g (about 0.05 mol of cobalt ions) of the treated lithium cobalt oxide positive electrode active material into 20 ml of 8 mol / L sulfuric acid solution, and add 2.5 ml of 30% hydrogen peroxide to dissolve. The insoluble impurities are removed, and the filtrate contains cobalt ions and lithium ions for use.

[0049] Add 12 g of lithium hydroxide solid to the filtrate obtained in (2), and control Li / Co=10:1. Add 2.5ml of 30% hydrogen peroxide into a 50ml polytetrafluoroethylene reactor with a filling capacity of 0.8, and place the reactor in an oven at 200°C for 24 hours.

[0050] After the reaction was stopped, it was taken out by filtration, centrifuged with water and ethanol, and the obtained lithium cobaltate crystals were dried for 12 hours, and finally a lithium cobaltate positive electrode material reprocessed by hydrothermal feeding was ...

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Abstract

The invention provides a method for feed-back compensation reproduction of an invalid lithium cobalt oxide structure of a cathode of a lithium battery. The method is carried out according to the following steps: (1) the waste lithium cobalt oxide battery is soaked in a sodium chloride solution for electric discharge, and a cathode material of the battery is obtained through disassembling; (2) thecathode material is subjected to ultrasonic soaking treatment through a DMF and NMP mixed organic solvent, then obtained precipitates are sintered, and after cooling, LixCoO2 powder is obtained through grinding; (3) the LixCoO2 powder reacts with an inorganic acid solution containing hydrogen peroxide, dissolving reproduction of cobalt is conducted, filtering is conducted to remove insoluble impurities, and leachate containing Li+ and Co2+ is obtained; (4) lithium hydroxide and an oxidizing agent solution are added into the leachate to obtain a mixed solution, the molar ratio of lithium to cobalt in the mixed solution is controlled to be 10 or above, and the mixed solution is poured into a reaction still to be subjected to a hydrothermal reaction; and (5) a product of the hydrothermal reaction is centrifugally separated, the precipitates are washed, and after drying, a lithium cobalt oxide crystal with the reproduced structure is obtained. According to the method, operation is easy, energy consumption is low, the efficiency is high, environment pollution can be reduced, and value of waste can be maximized.

Description

[0001] (1) Technical field [0002] The invention relates to a recycling method for waste lithium batteries, in particular to a method for remaking the structure of lithium cobalt oxide in the positive electrode of the lithium battery. [0003] (2) Technical background [0004] As a kind of energy storage equipment, lithium-ion battery has been widely used in the fields of terminal electronic communication, new energy storage, electric vehicles, household appliances, aerospace and military due to its advantages of high energy density, long cycle life, high voltage, and environmental protection. Applications. After a huge number of lithium-ion batteries are discarded, it not only wastes resources but also pollutes the environment. If the resources in waste lithium batteries can be recycled, the development of natural resources can be reduced, and a new road can be provided for sustainable economic and social development, which has important economic and social benefits, and can...

Claims

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Application Information

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IPC IPC(8): C01G51/00H01M10/54H01M4/525H01M10/0525
CPCC01G51/42H01M10/54H01M4/525H01M10/0525H01M2004/028Y02W30/84Y02E60/10
Inventor 郑松海夏银萍徐莹莹吴昊王连邦
Owner ZHEJIANG UNIV OF TECH
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