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A method for preparing nickel-manganese spinel cathode material by magnetic field texturing

A positive electrode material and spinel technology, which is applied in the field of preparing nickel-manganese spinel positive electrode material by magnetic field texture, can solve the problems of nickel-manganese spinel capacity decay and poor cycle performance, and achieve the effect of prolonging the production cycle

Active Publication Date: 2021-01-08
GUANGDONG BRUNP RECYCLING TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The present invention aims to utilize Mn by introducing an external magnetic field 3+ Interaction with the magnetic field, texturing the positive electrode material slurry to be coated, giving full play to the advantages of the (111) crystal plane orientation in nickel-manganese spinel, making it face the direction in contact with the electrolyte to the maximum extent, So as to improve the problems of nickel-manganese spinel capacity fading and poor cycle performance, and then provide a method for preparing nickel-manganese spinel cathode materials by magnetic field texturing

Method used

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  • A method for preparing nickel-manganese spinel cathode material by magnetic field texturing
  • A method for preparing nickel-manganese spinel cathode material by magnetic field texturing

Examples

Experimental program
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Effect test

Embodiment 1

[0064] Dissolve nickel nitrate and manganese nitrate in deionized water at a molar ratio of 1:3 to prepare a salt solution with a metal ion concentration of 0.35 mol / L. Ammonia water is used as a complexing agent, and the three components are introduced into the reactor with equal volumes by a peristaltic pump. The reaction temperature is controlled at 55±0.5°C, the pH value is 10±0.2, and the stirring speed is 1000r / min. After reacting for 12 hours, the obtained precipitate was washed with deionized water three times, and then dried at 120° C. for 24 hours under a nitrogen protective atmosphere. The obtained precursor was uniformly mixed with lithium carbonate according to the molar ratio Li / Me=1.2, and calcined in a high-temperature furnace at 1050° C. for 8 hours. The obtained massive splits are crushed and screened, mixed with binder and conductive agent to make positive electrode slurry, and an external magnetic field with a strength of 10T is applied during the stirring ...

Embodiment 2

[0067] Dissolve nickel sulfate and manganese sulfate in deionized water at a molar ratio of 1:3 to prepare a salt solution with a metal ion concentration of 0.8mol / L. At the same time, prepare the same volume and concentration of sodium hydroxide as a precipitant, 0.6mol / L Ammonia water was used as a complexing agent, and the three components were introduced into the reactor with equal volumes by a peristaltic pump. The reaction temperature was controlled at 70±0.5°C, the pH value was 9.7±0.2, and the stirring speed was 800r / min. After reacting for 7 hours, the obtained precipitate was washed with deionized water three times, and then dried at 120° C. for 24 hours under an argon protective atmosphere. The obtained precursor was uniformly mixed with lithium carbonate according to the molar ratio Li / Me=1.02, and calcined in a high-temperature furnace at 900° C. for 13 hours. The resulting massive splits are crushed and sieved, mixed with a binder and a conductive agent to make a...

Embodiment 3

[0070] Dissolve nickel acetate and manganese acetate in deionized water at a molar ratio of 1:3 to prepare a salt solution with a metal ion concentration of 0.6mol / L. Ammonia water is used as a complexing agent, and the three components are introduced into the reactor with equal volumes by a peristaltic pump. The reaction temperature is controlled at 40±0.5°C, the pH value is 10.8±0.2, and the stirring speed is 1200r / min. After reacting for 16 hours, the obtained precipitate was washed with deionized water three times, and then dried at 120° C. for 24 hours under a nitrogen protective atmosphere. The obtained precursor was uniformly mixed with lithium carbonate according to the molar ratio Li / Me=0.9, and calcined in a high-temperature furnace at 700° C. for 18 hours. The obtained massive splits are crushed and sieved, mixed with a binder and a conductive agent to make a positive electrode slurry, and an external magnetic field with a strength of 6T is applied during the stirri...

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Abstract

The invention discloses a method of preparing nickel-manganese spinel cathode material through magnetic field texturing, which includes steps of: 1) performing coprecipitation to nickel salt and manganese salt to prepare a Ni-Mn precursor; 2) uniformly mixing the Ni-Mn precursor with a lithium source, and calcining the mixture to prepare a nickel-manganese spinel material; 3) crushing and sievingthe nickel-manganese spinel material and stirring and mixing the nickel-manganese spinel material with an additive in a stirrer, and during the stirring, applying an external magnetic field to the slurry. By means of interaction between Mn<3+> and the magnetic field, texturing is achieved in the magnetic field, so that the cathode slurry can face to the contact direction of an electrolyte with (111) crystal face as most as possible when coating an aluminum foil, thereby solving the problems of capacity degradation and poor high temperature cycle performance during charge / discharge process of the nickel-manganese spinel material; in the invention, when being used for assembling a battery, a cathode plate has excellent cycle and rate performance, is high in energy density, and has excellentapplication prospect in the fields such as power cars, large-size power plants and the like.

Description

technical field [0001] The invention belongs to the technical field of positive electrode materials for lithium ion batteries, and in particular relates to a method for preparing nickel-manganese spinel positive electrode materials by magnetic field texturing. Background technique [0002] Lithium-ion batteries have been widely used in 3C fields such as notebook computers and mobile phones due to their high operating voltage, no memory effect, and environmental protection. The development of electric vehicles, hybrid electric vehicles and other large-scale power equipment puts forward higher requirements for their performance. It is particularly necessary and urgent to further improve the energy density and power density of lithium-ion batteries. High energy density can give the battery system better safety, and at the same time, it will further reduce the volume and weight of the battery, and achieve light weight to a certain extent. [0003] LiNi with spinel structure 0....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G53/00H01M4/505H01M4/525H01M10/0525
CPCC01G53/54H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 汪乾阮丁山刘婧婧唐盛贺李长东
Owner GUANGDONG BRUNP RECYCLING TECH
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