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A kind of 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 analysis, etc., achieve wide source of raw materials, improve safety, and high safety performance Effect

Active Publication Date: 2018-08-14
SHANDONG YUHUANG NEW ENERGY TECH
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  • Summary
  • 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 oxide and iron oxide, among which zinc oxide It has a great impact on the capacity of the material and the cycle performance of lithium intercalation and deintercalation, resulting in the phenomenon of lithium precipitation, which affects the safety performance of the battery

Method used

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  • A kind of preparation method of negative electrode material zinc ferrite
  • A kind of preparation method of negative electrode material zinc ferrite
  • A kind of preparation method of negative electrode material zinc ferrite

Examples

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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: adding a certain amount of iron source, zinc source and polyethylene glycol into deionized water, after ultrasonication, transferring the reaction solution to a magnetic heating stirrer for stirring and heating; A weak base or a strong base weak acid salt is added to the reaction solution to adjust the pH of the solution; after the reaction is completed, the reaction solution is transferred to an oven for drying, calcined and ground once; the ground solid is placed in a strong alkali solution of a certain concentration , stirring, filtering and washing, and the obtained solid product is calcined again to obtain zinc ferrite, a negative electrode material for lithium ion batteries. The nanostructured zinc ferrite prepared by this method has a stable lithium intercalation potential platform (~0.9v), does not produce lithium precipitation, and greatly improves the safety of the battery. At the same time, the material is non-toxic, non-polluting, and has high safety performance. , a wide range of raw materials and other advantages.

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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Patent Type & Authority Patents(China)
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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