Method for preparing polyion doping type iron phosphate with metallurgy iron dust content mud serving as main raw material

A main raw material, multi-ion technology, applied in the direction of electrical components, battery electrodes, circuits, etc., can solve the problem of high cost and achieve the effect of reducing the cost of preparation

Inactive Publication Date: 2012-07-18
ANHUI UNIVERSITY OF TECHNOLOGY
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Problems solved by technology

At present, the preparation of doped FePO at home and abroad 4 Most of them use chemical reagents as raw materials, and the cost is relatively high. There is no report on the preparation of ion-doped lithium-ion battery cathode material FePO4 from metallurgical iron-containing dust.

Method used

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  • Method for preparing polyion doping type iron phosphate with metallurgy iron dust content mud serving as main raw material
  • Method for preparing polyion doping type iron phosphate with metallurgy iron dust content mud serving as main raw material

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Embodiment 1

[0020] Example 1: Bake the converter mud at 110°C for 5 hours and grind it to an average particle size of 1 μ m powder; inject 50 mL of accurately prepared 3 mol / L sulfuric acid solution into a 250 mL beaker, weigh 10 g of converter mud powder, slowly add to the solution and stir, add deionized water to make the reaction system 80 mL, room temperature Lower the reaction for 1 h; filter with suction and repeatedly wash the filter cake, repeat 3 times, combine the filtrates at all levels; add 30% hydrogen peroxide to the filtrate, and use potassium ferricyanide to calibrate the oxidation end point (take a small amount of solution and drop it on the ferricyanide On potassium solids, if there are ferrous ions in the solution, the drop point will be blue, otherwise it will not change color); fill the oxidized filtrate with deionized water to 300 mL, pour it into a 500 mL beaker, and place it in 70 ℃ water bath, add 7 mL of 85% phosphoric acid under stirring, and then add 25% ammoni...

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Abstract

The invention discloses a method for preparing polyion doping type iron phosphate with metallurgy iron dust content mud serving as a main raw material, which belongs to the technical field of lithium ion battery positive pole material preparation. The method comprises using acidolysis and suction filtration methods to enable Fe in the metallurgy iron dust content mud and several or all of target elements of Mg, Al, Zn, Mn, Cr, NI, MO and V to transfer in filter liquor, dropping in hydrogen peroxide for oxidation, injecting the phosphoric acid in the filter liquor according to stoichiometric ratio, obtaining polyion phosphate predecessor with controllable doping element ratio by adjusting the PH value of a reaction system, roasting the predecessor in an air atmosphere, and finally obtaining the polyion doping type iron phosphate. Compared with a traditional method, the Fe element and a plurality of doping elements used in the method all come from the metallurgy iron dust content mud, so that the limit that the raw material for preparing the polyion doping type iron phosphate merely depends on a plurality of chemical reagents is overcome, preparation cost is reduced, simultaneously a new method is provided to material high value-added utilization of the metallurgy iron dust content mud.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery cathode material preparation, and in particular relates to a method for preparing multi-ion-doped lithium-ion battery cathode material iron phosphate by using metallurgical iron-containing dust as a main raw material. Background technique [0002] Among many cathode materials for lithium-ion batteries, iron phosphate (FePO 4 ) has attracted much attention due to its low cost, environmental friendliness, high theoretical specific capacity, and long cycle life. FePO 4 The conductivity is very low (10 -10 ~ 10 -11 S cm -1 ), which cannot be directly used as energy storage materials. Currently improving FePO 4 The common method of conductivity is C coating, but this method can only improve the surface conductivity of powder particles; in order to obtain better electrode reaction kinetics performance, the method of metal ion doping is usually used to improve its bulk conductivity to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58
CPCY02E60/12Y02E60/10
Inventor 吴照金高志芳李辽沙周元武杏荣朱建华
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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