Preparation method of negative electrode material zinc ferrite

A negative electrode material, zinc ferrite technology, applied in chemical instruments and methods, battery electrodes, iron compounds, etc., can solve problems affecting battery safety performance, lithium precipitation, etc., achieve a wide range of raw material sources, improve safety, and high safety performance Effect

Active Publication Date: 2016-10-12
SHANDONG YUHUANG NEW ENERGY TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

ZnFe reported from the literature 2 o 4 For the negative electrode of lithium-ion batteries, it is mainly prepared by solvothermal method, organic precursor pyrolysis and other methods. While obtaining the target product zinc ferrite, there are also other oxides such as zinc

Method used

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  • Preparation method of negative electrode material zinc ferrite
  • Preparation method of negative electrode material zinc ferrite
  • Preparation method of negative electrode material zinc ferrite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] First, 1.5g polyethylene glycol, 0.028mol ZnCl 2 and 0.059mol FeCl 3 6H 2 Dissolve O in 200ml of deionized water respectively, stir for 0.7h until the solids are completely dissolved, and after ultrasonication for 1h at room temperature, transfer the reaction solution as a whole to a water bath for heating. Add 14.8mol / L ammonia water to adjust the pH of the solution to about 9. After adding ammonia water to adjust the pH, the solution becomes viscous, increase the stirring speed to 500r / min, stop heating after 5 hours of reaction, let the reaction solution stand for 12 hours, and divide the solution After layering, put the sediment in the lower layer into an oven at 100°C to dry and grind, then calcined at 800°C for 5 hours, put the calcined solid into 1mol / L KOH solution, stir, filter, wash, dry, and grind, and finally Calcination was carried out at ℃ for 6 hours to obtain the product zinc ferrite.

Embodiment 2

[0027] First, 1.6g polyethylene glycol, 0.027mol ZnCl 2 and 0.057mol FeCl 3 Dissolve in 300ml of deionized water respectively, stir for 0.7h until the solids are completely dissolved, and after ultrasonication for 1h at room temperature, transfer the reaction solution as a whole to a water bath for heating. Adjust the pH of the solution with 14.8mol / L ammonia water between 8 and 9. After adding ammonia water to adjust the pH, the solution becomes viscous, increase the stirring speed to 500r / min, stop heating after 5 hours of reaction, and let the reaction solution stand for 10 hours. After the solution is layered, put the lower precipitate in an oven at 120°C to dry, grind, and calcinate at 750°C for 5 hours. The calcined solid is put into 1mol / L KOH solution, stirred, filtered, washed, dried, and ground. Calcination was carried out at 900° C. for 8 hours to obtain the product zinc ferrite.

Embodiment 3

[0029] First, 1.3g polyethylene glycol, 0.02mol Zn(NO 3 ) 2 6H 2 O and 0.06mol FeCl 3 6H 2 Dissolve O in 300ml of deionized water respectively, stir for 0.5h until the solids are completely dissolved, and after ultrasonication for 1h at room temperature, transfer the reaction solution as a whole to a water bath for heating. Add 14.8mol / L ammonia water to adjust the pH of the solution to be greater than 9. After adding ammonia water to adjust the pH, the solution becomes viscous, increase the stirring speed to 500r / min, stop heating after 5 hours of reaction, let the reaction solution stand for 11 hours, and the solution is layered Finally, put the lower precipitate in an oven at 100°C to dry and grind, then calcined at 800°C for 5 hours, put the calcined solid into 1mol / L KOH solution, stir, filter, wash, dry, grind, and finally put it in 900°C Calcined for 7h at the lower temperature to obtain the product zinc ferrite.

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Abstract

The invention relates to the technical field of lithium-ion batteries, in particular to a preparation method of a negative electrode material zinc ferrite. The preparation method of the negative electrode material zinc ferrite comprises the following steps of: adding a certain amount of iron source, zinc source and polyethylene glycol to deionized water, carrying out ultrasound, transferring a reaction liquid to a magnetic heating stirrer for stirring and heating; adding a weak alkali or strong alkali and weak acid salt to the reaction liquid and adjusting the pH of the solution; after reaction is ended, transferring the reaction liquid to an oven for drying and carrying out primary calcination and grinding; and putting the ground solid into a certain concentration of strong alkali solution, carrying out stirring, filtering and washing and carrying out calcination on the obtained solid product again to obtain the negative electrode material zinc ferrite for the lithium-ion battery. The nanostructure zinc ferrite prepared by the method has a stable lithium-intercalated potential platform (about 0.9v); the lithium precipitation phenomenon is not generated; the safety of the battery is greatly improved; and meanwhile, the material has the advantages of being nontoxic, pollution-free, high in safety performance, wide in raw material source and the like.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a preparation method of zinc ferrite, a negative electrode material. Background technique [0002] The main disadvantage of carbon anode materials currently used in industry is the low actual capacity. In order to meet the needs of high-energy power sources, new lithium-ion battery anode materials with high capacity and long life are explored to replace the current low-capacity graphite anode materials. is of great significance. The researchers found that metal oxides (Fe 3 o 4 、Co 3 o 4 , SnO 2 ) has a relatively high lithium ion intercalation and extraction capacity in lithium batteries. As a negative electrode material for lithium-ion batteries, ZnFe 2 o 4 It can not only undergo conversion reaction, but compared with general transition metal oxides, the Zn produced by the conversion reaction can also undergo alloying reaction with Li, so it has a higher ...

Claims

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Application Information

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IPC IPC(8): H01M4/58H01M10/0525C01G49/00
CPCC01G49/0063H01M4/5825H01M10/0525Y02E60/10
Inventor 张焕吕金钊程浩然李进潘薛嘉渔赵成龙王瑛
Owner SHANDONG YUHUANG NEW ENERGY TECH
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