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Method for preparing multi-element doping lithium iron phosphate by taking ferrous metallurgy sludge as main raw material

A technology for iron and steel metallurgy and lithium iron phosphate, which is applied in the field of preparing multi-component doped lithium iron phosphate, and can solve the problems of large differences in composition and characteristics, low value-added utilization, and vicious cycle enrichment of harmful elements.

Inactive Publication Date: 2012-11-14
ANHUI UNIVERSITY OF TECHNOLOGY
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Problems solved by technology

However, due to the different conditions for the generation of various metallurgical dust and sludge, their composition and characteristics vary greatly, and a large amount of returning to iron and steel production not only brings difficulty in batching, but also leads to a vicious cycle of enrichment of harmful elements
In addition, this utilization method fails to make the best use of the precious trace element resources in this type of dust and mud, making it at the low value-added utilization level

Method used

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  • Method for preparing multi-element doping lithium iron phosphate by taking ferrous metallurgy sludge as main raw material

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Embodiment

[0019] Embodiment: take by weighing 100g electric furnace dedusting ash and 20g coke (-80 order), pack graphite crucible, be placed in furnace at 1200 ℃ in N 2 Roast in atmosphere for 3 hours, take out and air cool to room temperature. The processed sample is subjected to grinding and magnetic separation to obtain an Fe-based multi-element alloy phase containing various doping elements. The obtained Fe-based multi-element alloy was oxidized at 500° C. for 3 hours in an air environment to obtain a composite oxide. Detect the composition of complex oxides, according to the chemical formula The stoichiometric ratios shown were dosed. Weigh 20g composite oxide, 14.98g NH 4 h 2 PO 4 , 5.58g LiOH 2H 2 0 and 3g of polypropylene powder were mixed and ball milled (rotating speed 400rpm, time 2 hours). The ground powder was placed in a ceramic crucible and heated at 700 °C under N 2 Roasting under protection for 6 hours, cooling to room temperature with the furnace, that is, mu...

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Abstract

The invention discloses a method for preparing multi-element doping lithium iron phosphate by taking ferrous metallurgy sludge as main raw material, belonging to the preparation technical filed of cathode material of lithium ion batteries. In the method, Fe-base multi-element alloy phase containing multiple doping elements is obtained from the ferrous metallurgy sludge by a reduction and magnetic separation method, the Fe-base multi-element alloy phase is oxidized to obtain composite oxide which is Fe source and a multi-doping-element source, Li and P are added in by chemical metering, and multi-element doping lithium iron phosphate is synthesized by roasting under the protection of inert gas such as N2 or Ar. The Fe element and multiple doping elements (a plurality kinds of Zn, Cr, Ni, Mo, V, Mn, Ti or all) for preparing the multi-element doping lithium iron phosphate are from the ferrous metallurgy sludge, thereby overcoming the limitation that the raw material for preparing the multi-element doping lithium iron phosphate depends on various chemical agents singly, providing a new pathway for high value-added utilization of the ferrous metallurgy sludge while reducing the preparation cost.

Description

Technical field: [0001] The invention belongs to the technical field of preparation of positive electrode materials for lithium ion batteries, and in particular relates to a method for preparing multi-element doped lithium iron phosphate by using iron and steel metallurgical dust as a main raw material. Background technique: [0002] Lithium iron phosphate (LiFePO 4 ) is currently recognized as the most promising cathode material for high-capacity green power lithium-ion batteries due to its relatively low cost, environmental friendliness, high safety, high charge-discharge specific capacity, and long cycle life. But undoped LiFePO 4 The conductivity is very low (10 -9 S cm -1 ), which cannot be directly used as energy storage materials. Currently improved LiFePO 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, element doping is usually ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/04H01M4/58
CPCY02E60/12Y02E60/10
Inventor 吴照金李辽沙武杏荣王平
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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