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Full-component resource reclamation method for waste positive electrode materials of lithium ion batteries

A technology for lithium ion batteries and positive electrode materials, which is applied to the recycling and re-preparation of waste ternary composite positive electrode materials, and the full-component recycling of waste lithium ion battery positive electrode materials, can solve the problem of low separation efficiency between active materials and aluminum foil, Complex process, secondary pollution and other problems

Active Publication Date: 2012-10-24
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of the deficiencies of the prior art, in order to solve the problems of the prior art such as complicated process, low separation efficiency of active material and aluminum foil, narrow scope of application and serious secondary pollution, the purpose of the present invention is to provide a high-efficiency separation of waste lithium-ion battery cathode materials Active material and aluminum foil, and then the method of recycling waste lithium-ion battery positive electrode materials with full components

Method used

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  • Full-component resource reclamation method for waste positive electrode materials of lithium ion batteries
  • Full-component resource reclamation method for waste positive electrode materials of lithium ion batteries
  • Full-component resource reclamation method for waste positive electrode materials of lithium ion batteries

Examples

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Effect test

Embodiment 1

[0044] refer to figure 1 , take about 12.5g of waste nickel cobalt lithium manganese oxide ternary composite positive electrode material after sorting, wherein the binder used is polytetrafluoroethylene, and then prepare battery material grade nickel cobalt lithium manganese oxide according to the following steps. Specific steps are as follows:

[0045] (1) Add about 12.5g of waste nickel-cobalt-lithium manganese oxide ternary composite positive electrode material after sorting to 100mL of trifluoroacetic acid aqueous solution with a volume concentration of 10%, stir and react in a constant temperature environment of 50°C for 240min, and the reaction is completed Afterwards, liquid-solid-solid separation is carried out to obtain leachate, lithium-containing active material and aluminum foil respectively. The mass content distribution of nickel, cobalt, manganese, lithium and aluminum in the leaching solution, lithium-containing active material and aluminum foil was determined...

Embodiment 2

[0058] Take 15g of a mixture of lithium nickel cobaltate binary composite positive electrode material and lithium manganate positive electrode material waste products in a mass ratio of 2:1, wherein the binder used is polyvinylidene fluoride, and then prepare the battery material according to the following steps Grade Nickel Cobalt Lithium Manganese Oxide. Specific steps are as follows:

[0059] Step (1) ~ step (3) and step (6) are the same as in Example 1, and the rest of the steps are as follows:

[0060] (4) Add 4mol L to the leaching solution obtained in step (1) -1 Nitric acid, and heated to about 80 ° C, using the difference in relative volatility to recover trifluoroacetic acid, used to continue to process waste lithium-ion battery cathode materials, after testing, the recovery rate of trifluoroacetic acid is 80%. Then add 1mol·L to the raffinate after acid heat treatment -1 Potassium hydroxide solution is heated to about 80° C., the pH value of the raffinate is adju...

Embodiment 3

[0068] Take about 30g of a mixture of lithium nickel manganese oxide binary composite positive electrode material and lithium cobaltate positive electrode material scrap with a mass ratio of 2:1, wherein the binder used is styrene-butadiene rubber, and then prepare the battery material according to the following steps Grade Nickel Cobalt Lithium Manganese Oxide. Specific steps are as follows:

[0069] Steps (4) to (7) are the same as in Example 1, and the rest of the steps are as follows:

[0070] (1) Add about 30g of the above-mentioned positive electrode material scrap mixture after sorting to 600mL of trifluoropropionic acid aqueous solution with a volume concentration of 25%, and stir and react in a constant temperature environment of 40°C for 30min. After the reaction is completed, carry out liquid-solid- Solids were separated to obtain leachate, lithium-containing active material and aluminum foil respectively. The mass content distribution of nickel, cobalt, manganese...

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Abstract

The invention provides a full-component resource reclamation method for waste positive electrode materials of lithium ion batteries. The method comprises the following steps: 1) separating active substances and aluminum foils in waste positive electrode materials of lithium ion batteries by using an aqueous solution of fluorine-containing organic acid and carrying out liquid-solid-solid separation so as to obtain leachate, the lithium-containing active substances and the aluminum foils; 2) respectively carrying out high temperature roasting and impurity removal with alkali liquor on the lithium-containing active substances; 3) respectively carrying out recovery of the fluorine-containing organic acid through addition of acid and distillation, deposition of impurity ions through addition of alkali and ammonium carbonate coprecipitation on the leachate so as to prepare nickel-cobalt-manganese carbonate ternary precursor; and 4) carrying out component regulation on a mixture of the treated active substances and the nickel-cobalt-manganese carbonate ternary precursor, adding lithium carbonate in a certain proportion and carrying out high temperature solid phase sintering so as to prepare a lithium nickel cobalt manganese oxide ternary positive electrode material. The method provided in the invention has the following advantages: the application scope of the method is wide; separation efficiency of the lithium-containing active substances and the aluminum foils is high; short-flow direct re-preparation of positive electrode materials in waste lithium ion batteries is realized; and the method is applicable to large-scale resource reclamation of waste lithium ion batteries.

Description

technical field [0001] The invention relates to a recycling method for all components of a waste lithium-ion battery cathode material, in particular to a recycling and re-preparation method for a waste ternary composite cathode material, which belongs to the technical field of secondary resource recycling and circular economy. Background technique [0002] Due to the advantages of high charging voltage, large specific energy, long cycle life, good safety performance, no memory effect, and small self-discharge, lithium-ion batteries have been widely used in mobile phones and notebook computers since they were commercialized in the 1990s. , Camcorders, digital cameras, medical equipment and other portable electronic products. In recent years, as the prices of consumer electronic products such as mobile phones and notebook computers have dropped significantly, the penetration rate of these products has greatly increased, which has led to an increase in the demand for lithium-io...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/54
CPCY02E60/12Y02W30/84
Inventor 曹宏斌张西华谢勇冰林晓张懿
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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