Method for washing positive electrode material precursor

A cathode material and washing method technology, applied in chemical instruments and methods, battery electrodes, inorganic chemistry, etc., can solve the problems of wasting water, affecting the production cost of precursors, affecting the production cost of cathode materials, etc. The effect of electrochemical performance

Active Publication Date: 2020-06-02
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, subject to the strict production conditions of the process, there is a high content of sodium sulfate impurities in the precursor synthesis process, which seriously affects the performance of the positive electrode material. The traditional method uses

Method used

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  • Method for washing positive electrode material precursor
  • Method for washing positive electrode material precursor
  • Method for washing positive electrode material precursor

Examples

Experimental program
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preparation example Construction

[0067] The preparation method of the sulfonamido polypyrrole permeable membrane is:

[0068] 1) heating the sulfonamide polypyrrole and a solvent to obtain a sulfonamide polypyrrole solution;

[0069] 2) immersing the base film in a sulfonamide-based polypyrrole solution, and then drying;

[0070] 3) Repeat step 2) to obtain the diaphragm;

[0071] 4) drying the membrane after washing to obtain a sulfonamide-based polypyrrole permeable membrane;

[0072] Specifically, the sulfonamide polypyrrole and the solvent are stirred at room temperature for 5-10 hours, heated to 40-60° C. and kept for 5-10 hours to obtain a sulfonamide-polypyrrole solution for later use; the solvent is preferably N-methylpyrrolidone.

[0073] Immerse the base membrane of the permeable membrane in the above-mentioned sulfonamide-based polypyrrole solution, keep it for 20-30 minutes, take it out for vacuum drying, and then immerse it in the sulfonamide-based polypyrrole solution again after drying, repea...

Embodiment 1

[0114] The present embodiment provides a kind of lithium-ion battery cathode material precursor cleaning device, see figure 1 , figure 1 A schematic diagram of a lithium-ion battery cathode material precursor washing device provided by the present invention, wherein, 1-PP tank; 2-cathode chamber; 3-water inlet; 4-cation selective permeable membrane; 5-PP Tank; 6-feeding port; 7-stirring motor; 8-stirring paddle; 9-anion selective permeable membrane; 10-feeding port; 11-PP tank; 12-feeding port; Outlet; 15-anode chamber; 16-outlet; 17-electrode+; 18-electrode; -19-power supply.

[0115] The lithium ion battery cathode material precursor washing method and device thereof provided in this embodiment include

[0116] The present invention provides a lithium ion battery cathode material precursor washing method and its device, comprising: a washing stirring tank including a water inlet, a feeding inlet, a stirring motor, and a stirring paddle;

[0117] The cathode chamber includ...

Embodiment 2

[0122] A method for washing a lithium ion battery cathode material precursor, comprising the following steps:

[0123] 1) Synthesize the cathode material precursor of lithium-ion battery by co-precipitation method, which is mainly Ni 0.5 co 0.2 mn 0.3 (OH) 2 ; It contains impurity ions as Na + and SO 4 2- , where the original sodium ion concentration of the precursor is 8000ppm

[0124] 2) Add 100 kg of precursor to the 250L washing tank, add 100L deionized water and stir;

[0125] 3) Control the temperature of the solid-liquid mixture in the washing tank at 45°C and the pH at about 10.5 and start stirring.

[0126] 4) With a voltage of about 2500V, under the action of an electric field, the impurity ions Na contained in the precursor + , SO 4 2- Respectively through the anion and cation sulfonamide-based polypyrrole permeable membrane and polyethersulfone permeable membrane to the cathode chamber B and anode chamber C enrichment,

[0127] 5) Discharge the impurity ...

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Abstract

The invention provides a method for washing a positive electrode material precursor. The method comprises the following steps: putting a positive electrode material precursor containing impurity ionsinto a washing device, and treating to obtain a positive electrode material precursor slurry of which the impurity ion concentration meets the requirement, wherein the washing device comprises a cathode chamber, a mixture chamber and an anode chamber which are sequentially separated by a cation selective permeable membrane and an anion selective permeable membrane; the cation selective permeable membrane is selected from a sulfamide polypyrrole and polyether-ether-ketone permeable membrane or a sulfamide polypyrrole permeable membrane; and the anion selective permeable membrane is selected from a polyethersulfone permeable membrane. When the precursor is washed by adopting the method, the morphology and components of the precursor are not influenced, and meanwhile, impurities Na<+> and SO4<2-> of the precursor can be reduced to be 100 ppm or less, so that the excellent electrochemical performances of the precursor after the material is sintered in the later period are ensured; and according to the method, a large amount of water is saved, meanwhile, byproducts Na<+> and SO4<2-> can be recycled respectively, and the production cost of the material is reduced by washing with the method.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a washing method for a positive electrode material precursor. Background technique [0002] As a secondary battery, lithium-ion batteries have been maturely commercialized in the field of small power batteries such as 3C electronic products, mobile power supplies, electric tools, and electric bicycles. The positive electrode materials used mainly include lithium iron phosphate, lithium manganese oxide, and lithium cobalt oxide. And ternary materials, lithium-rich manganese-based cathode materials, etc. With the change of the global energy pattern, suitable high specific energy (>250Wh / g nickel-cobalt-manganese ternary materials and lithium-rich manganese-based cathode materials have attracted widespread attention from researchers, and are expected to be commercialized as cathode materials for next-generation power batteries , such as hybrid electric ...

Claims

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Application Information

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IPC IPC(8): C01G53/00H01M4/505H01M4/525
CPCC01G53/006H01M4/505H01M4/525Y02E60/10
Inventor 顾庆文赛喜雅勒图张国华刘兆平
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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