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Method for preparing ternary cathode material precursor by using waste lithium battery materials

A technology for waste lithium batteries and positive electrode materials, which is applied in the field of preparation of ternary positive electrode material precursors, can solve the problems of particle agglomeration of ternary material precursors, inability to effectively control the particle size and shape of ternary materials, and prevent particles from Agglomeration, improved recovery efficiency, and high tap density

Active Publication Date: 2019-12-27
TIANQI LITHIUM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Technical problem to be solved: the purpose of this invention is to solve the problem that there may be trace amounts of high-valent nickel-cobalt-manganese ions in the precipitation of the prior art precursor, the particle agglomeration of the precursor of the ternary material, and the inability to effectively control the particle size and shape of the ternary material, etc. , to provide a simple process, low energy consumption, wide application range, environmental protection, rich sources of raw materials and can effectively solve the problem of particle agglomeration using waste lithium-ion battery materials to prepare a narrow particle size distribution and uniform mixing method for the precursor of the ternary cathode material

Method used

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  • Method for preparing ternary cathode material precursor by using waste lithium battery materials
  • Method for preparing ternary cathode material precursor by using waste lithium battery materials
  • Method for preparing ternary cathode material precursor by using waste lithium battery materials

Examples

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Effect test

Embodiment 1

[0042] Take 50g of nickel-cobalt-lithium-manganese-manganate positive electrode strips from waste lithium-ion batteries, use nitric acid with a concentration of 8mol / L to stir and leach the positive electrode strips at 55°C for 30min, and filter after leaching to obtain a mixture of nickel, cobalt, manganese, lithium, and aluminum nitrates. solution; add diatomaceous earth, filter to remove impurities that are not dissolved by acid in the positive electrode material, and obtain a mixed solution of nickel, cobalt, manganese, and lithium nitrate; add 15wt.% ascorbic acid to the solution, control the reaction temperature at 30 ° C, and react for 2 hours; After the reaction, use sodium hydroxide solution to adjust the pH value of the solution to 5 to form aluminum hydroxide precipitates. After maintaining for 30 minutes, add diatomaceous earth and filter to remove the aluminum hydroxide precipitates to obtain a mixture containing only divalent nickel, cobalt, manganese and lithium n...

Embodiment 2

[0046] Get 50g of lithium cobalt oxide and lithium nickel cobalt manganese oxide positive electrode belt of waste lithium ion battery, adopt the nitric acid that concentration is 6mol / L when stirring and leaching 40min to positive electrode belt at 60 ℃, filter after leaching to obtain nickel, cobalt, manganese, lithium, Aluminum nitrate mixed solution; add diatomaceous earth, filter to remove impurities that are not dissolved by acid in the positive electrode material, and obtain nickel, cobalt, manganese, and lithium nitrate mixed solution; add 15wt.% ascorbic acid to the solution, and control the reaction temperature to 40°C , reacted for 1.5h; after the reaction, use sodium hydroxide solution to adjust the pH value of the solution to 4.5 to form aluminum hydroxide precipitate, keep it for 40min, add diatomaceous earth and filter to remove the aluminum hydroxide precipitate, and obtain a solution containing only divalent nickel, cobalt, and manganese Mix solution with lithiu...

Embodiment 3

[0050] Take 50g of nickel-cobalt-lithium-manganese-manganate positive electrode strips from waste lithium-ion batteries, use nitric acid with a concentration of 4mol / L to stir and leach the positive electrode strips at 60°C for 50min, and filter after leaching to obtain a mixture of nickel, cobalt, manganese, lithium, and aluminum nitrates. solution; add diatomaceous earth, filter to remove impurities that are not dissolved by acid in the positive electrode material, and obtain a mixed solution of nickel, cobalt, manganese, and lithium nitrate; add 10wt.% ascorbic acid to the solution, control the reaction temperature at 50°C, and react for 1.5h After the reaction, use sodium hydroxide solution to adjust the pH value of the solution to 4, generate aluminum hydroxide precipitate, add diatomaceous earth and filter to remove the aluminum hydroxide precipitate after keeping for 40min, and obtain only divalent nickel, cobalt, manganese and lithium nitrate Mix the solution; add nicke...

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Abstract

The invention provides a method for preparing a ternary cathode material precursor by using a waste lithium battery material. The method comprises the steps of adding an acid for leaching a cathode material to obtain a solution; adding an ascorbic acid to further reduce Co<3+>, Ni<3+> and Mn<4+> in the solution into a bivalent ion state, adjusting pH by using an alkali liquid and removing impurities of aluminum, iron and the like; adding a proper amount of nickel-cobalt-manganese nitrate to adjust the molar ratio of nickel, cobalt, manganese and lithium in the solution; and adding a complexing agent, finally adjusting the pH value, adding a precipitator for precipitation to prepare the ternary cathode material precursor. The method for preparing the ternary cathode material precursor which is narrow in particle size distribution and is evenly mixed by using the waste lithium battery material is provided for the problems that trace amounts of high-valence nickel-cobalt-manganese ions and ternary material precursor particles can be reunited in precursor precipitation and the particle size and the shape and form of the ternary material cannot be effectively regulated and controlled.

Description

technical field [0001] The invention belongs to the technical field of lithium battery electrode materials, and in particular relates to a method for preparing a precursor of a ternary positive electrode material by using waste lithium battery materials. Background technique [0002] Lithium-ion batteries have more advantages than other rechargeable batteries (such as Ni-Cd batteries and Ni-H batteries), including large specific energy, high energy density, high output voltage, long cycle life, low self-discharge rate, and High current charging and discharging, no memory effect and wide operating temperature range, so it is widely used in modern digital electronic products such as mobile phones, tablet computers and digital cameras, and has gradually become the preferred power source for energy storage devices and electric vehicles. . [0003] According to statistics from the China Battery Industry Association, in 2015, the national lithium-ion battery industry produced 5.6...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/50H01M4/52H01M4/62H01M10/0525
CPCH01M4/364H01M4/502H01M4/523H01M4/628H01M10/0525Y02E60/10
Inventor 曹乃珍高洁王梦肇巍徐川周梅党春霞
Owner TIANQI LITHIUM CORP
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