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Preparation method of doped lithium iron oxide

A lithium ferrite, doped technology, applied in the direction of chemical instruments and methods, iron compounds, active material electrodes, etc., can solve the problems of small specific surface area and low activity of materials, and achieve uniform distribution of iron, good activity, crystallization high degree of effect

Inactive Publication Date: 2019-11-08
李旭意
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the current conventional process is to mix lithium carbonate with iron oxide red and then calcined. The calcined material generally has a small specific surface area and low activity.

Method used

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  • Preparation method of doped lithium iron oxide
  • Preparation method of doped lithium iron oxide
  • Preparation method of doped lithium iron oxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A preparation method of doped lithium ferrite,

[0036] After the battery-grade lithium carbonate is slurried, carbon dioxide is introduced to completely dissolve and clarify it, and a ceramic membrane is used for precision filtration to obtain a lithium bicarbonate solution; the reagent pure ferrous ammonium sulfate is added to pure water for dissolution, and a ceramic membrane is used for precision filtration , to obtain ferrous ammonium sulfate solution; add reagent pure titanyl sulfate to pure water to dissolve, and use ceramic membrane to carry out fine filtration to obtain titanyl sulfate solution; prepare a mixed solution of ammonium sulfate and hydrazine hydrate, and then add polyethylene glycol, Stir and dissolve to obtain the bottom solution; the acid-base regulator is ammonium bicarbonate solution.

[0037] The detection data of lithium bicarbonate solution, ferrous ammonium sulfate solution, titanyl sulfate solution and bottom liquid are as follows:

[0038...

Embodiment 2

[0049] A kind of preparation method of doped type lithium ferrite, it adds lithium bicarbonate solution, ferrous ammonium sulfate solution, titanium oxysulfate solution and acid-base regulator into the end solution in parallel, maintains the pH of the process to be 7.4, and the temperature is 50°C, the stirring speed is 300r / min, after the feeding is completed, the temperature is raised to 95°C, and after stirring and reacting for 40min, the precipitate is obtained by filtration and washing;

[0050] After the obtained precipitate was dried, it was put into a rotary kiln for calcination, the calcination temperature was 825°C, air was introduced during the calcination process, and the calcination time was 9 hours to obtain the calcined material;

[0051] The calcined material is crushed and then sieved to remove iron to obtain doped lithium ferrite.

[0052] After the battery-grade lithium carbonate is slurried, carbon dioxide is introduced to completely dissolve and clarify it...

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Abstract

The invention discloses a preparation method of doped lithium iron oxide, and belongs to the technical field of new energy. The preparation method comprises following steps: a lithium hydrogencarbonate solution, an ammonium ferrous sulfate solution, a titanyl sulfate solution, and an acidifying or alkalizing agent are mixed, and are added into a base solution, wherein in the adding process, the pHvalue is maintained to be 7 to 7.5, the temperature is controlled to be 50 to 60 DEG C, and the stirring speed is controlled to be 300 to 400r / min; after material adding, the temperature is increasedto 90 to 95 DEG C, stirring reaction is carried out for 30 to 60min, and filtering washing are carried out to obtain a precipitate; the precipitate is subjected to drying, is introduced into a rotarykiln for calcining at 700 to 900 DEG C for 8 to 10h to obtain a calcined product, wherein air is introduced in calcining; and the calcined product is subjected to crushing, sieving, and removing of iron to obtain the doped lithium iron oxide. According to the preparation method, preparation of the doped lithium iron oxide can be realized, the surface area is large, the activity is high, and the surface is of a porous structure.

Description

technical field [0001] The invention relates to a preparation method of doped lithium ferrite, which belongs to the technical field of new energy. Background technique [0002] When high iron is used as the positive electrode material of the battery, the electrode reaction is a three-electron reaction, and the potential and energy of the battery are higher than that of the traditional zinc-manganese battery. Moreover, this material is cheap and non-polluting to the environment, so it has received extensive attention from the electrochemical community. [0003] Compared with lithium iron phosphate and other materials, the theoretical capacity of lithium ferrite is very high, and lithium ferrite has good conductivity and high tap density. [0004] However, the current conventional process is to mix lithium carbonate and red iron oxide and then calcined, and the calcined material generally has a small specific surface area and low activity. Contents of the invention [0005...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/00H01M4/58
CPCC01G49/009C01P2004/03C01P2004/61C01P2006/11C01P2006/12H01M4/5825H01M2004/028Y02E60/10
Inventor 李旭意
Owner 李旭意
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