Method for preparing cathode material of lithium ion battery

A technology for lithium ion batteries and cathode materials, which is applied in battery electrodes, battery recycling, circuits, etc., can solve the problems of complex types of cathode materials, reduce the demand for equipment and chemicals, reduce the addition of impurities, and reduce the preparation cost. Effect

Inactive Publication Date: 2014-07-30
SOUTH CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, according to the recent development of lithium-ion battery cathodes, in addition to lithium cobalt oxide, materials such as nickel-cobalt lithium manganate and lithium manganate are also used in batteries or may be used in batteries, which makes waste lithium-ion batteries more expensive. The types of cathode materials have become more complex, and some recycling methods developed in the early stage that can only recover lithium cobalt oxide are useless in practice.

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  • Method for preparing cathode material of lithium ion battery

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Embodiment 1

[0022] The waste lithium-ion battery to be recovered in this embodiment is a one-element lithium-ion battery whose cathode material is lithium cobalt oxide collected from the market, and the recycling flow chart is as follows figure 1 shown. The method for reclaiming the cathode material of the waste lithium-ion battery in this embodiment and then using it to prepare the cathode material of the lithium-ion battery comprises the following steps:

[0023] 1) Disassemble the battery in an anhydrous glove box, open the shell of the used battery, separate the cathode sheet of the battery from the battery, soak the cathode sheet in dimethyl carbonate, and make the electrolyte impurities contained in the cathode sheet Dissolve in dimethyl carbonate, wash away the electrolyte with dimethyl carbonate (DMC), filter again, and collect the cathode sheet. After the cathode piece is taken out, it is put into water, and the lithium cobaltate cathode material is separated from the aluminum p...

Embodiment 2

[0027] The waste lithium-ion battery to be treated in this embodiment is a lithium-ion battery whose cathode material is lithium manganate collected from the market. The method for reclaiming the cathode material of the waste lithium ion battery in this embodiment and then using it to prepare the cathode material of the lithium ion battery comprises the following steps:

[0028] 1) Disassemble the battery in an anhydrous glove box, open the shell of the used battery, separate the cathode sheet of the battery from the battery, soak the cathode sheet in dimethyl carbonate, and make the electrolyte impurities contained in the cathode sheet Dissolve in dimethyl carbonate, wash away the electrolyte with dimethyl carbonate (DMC), filter again, and collect the cathode sheet. After the cathode sheet is taken out, put it into the water, separate the lithium manganate cathode material from the aluminum sheet by means of ultrasonic waves, and then sieve the cathode material and the alumi...

Embodiment 3

[0032] The waste lithium ion battery to be processed in this embodiment is a lithium ion battery whose cathode material is lithium nickel manganese cobalt oxide collected from the market. The method for reclaiming the cathode material of the waste lithium-ion battery in this embodiment and then using it to prepare the cathode material of the lithium-ion battery comprises the following steps:

[0033]1) Disassemble the battery in an anhydrous glove box, open the shell of the used battery, separate the cathode sheet of the battery from the battery, soak the cathode sheet in dimethyl carbonate, and make the electrolyte impurities contained in the cathode sheet Dissolve in dimethyl carbonate, wash away the electrolyte with dimethyl carbonate, and then filter to collect the cathode sheet. The cathode material on the cathode sheet is separated from the aluminum sheet by brushing, and the separated cathode material lithium nickel manganese cobaltate is dried.

[0034] 2) Determinati...

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Abstract

The invention discloses a method for preparing a cathode material of a lithium ion battery. The method comprises the following steps: 1, separating a cathode material on a cathode sheet of a waste and old lithium ion battery or a cathode material in lithium ion battery production scraps; and 2, determining the mass ratio of useful elements in the separated cathode material, calculating deficient elements of the separated cathode material according to the mass ratio of the elements of raw materials for preparing the cathode material of the lithium ion battery, adding compounds of the deficient elements in order to reach the stoichiometric ratio of a target product, and preparing the cathode material of the lithium ion battery. The method can recycle cathode materials comprising lithium cobaltate, nickel cobalt lithium manganate and lithium manganate used in waste and old lithium ions and cathode material scraps comprising lithium cobaltate, nickel cobalt lithium manganate and lithium manganate generated in the production of the lithium ion battery according to the waste recycling situation.

Description

Technical field: [0001] The invention belongs to the technical field of battery material preparation, and in particular relates to a method for preparing lithium-ion battery cathode materials. Background technique: [0002] Since the 1990s, lithium-ion batteries have been greatly developed due to their advantages such as high charging voltage, large specific energy, long cycle life, good safety, no pollution, no memory effect, and small self-discharge. Now the battery has been widely used in the field of portable electronic products, including mobile phones, notebook computers, video cameras, digital cameras, medical equipment and so on. In recent years, the world's battery production and sales have been growing at an annual rate of more than 10%. my country is the world's largest battery producer and consumer. The cathode material for preparing lithium-ion batteries was mainly lithium cobalt oxide in the early stage. In recent years, materials such as nickel-cobalt lithiu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/54H01M4/1397
CPCH01M4/505H01M4/525H01M10/54Y02E60/10Y02W30/84
Inventor 南俊民詹秋设朱宇豪卢孟娆林悦左晓希肖信叶志平
Owner SOUTH CHINA NORMAL UNIVERSITY
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