Method for preparing polynary doped lithium ferrous phosphate by using copper scale extract as main raw material

A technology of lithium iron phosphate and main raw materials, applied in the field of preparing multi-component doped lithium iron phosphate, can solve the problems of not many, unfavorable structure and composition of copper slag, etc.

Inactive Publication Date: 2009-09-30
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Abstract
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Problems solved by technology

The difficulty of these recycling methods is that the structure and composition of copper slag are not conducive to processing processes such as beneficiation and leaching, so there are not many efficient methods for industrial production scale

Method used

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  • Method for preparing polynary doped lithium ferrous phosphate by using copper scale extract as main raw material

Examples

Experimental program
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Embodiment 1

[0019] Embodiment 1: Take by weighing 100g converter copper slag grain (particle diameter 1mm~5mm) and 40g coke (-40 order), put into graphite crucible, be placed in the furnace at 1200 ℃ in N 2 Roast in atmosphere for 2 hours, take out and air cool to room temperature. The treated copper slag is ground and magnetically separated to obtain an Fe-based multi-element alloy phase containing various doping elements. XRF test shows that the total molar concentration of doping elements is 7.24%, and the rest is Fe. The obtained Fe-based multi-element alloy phase was oxidized at 500° C. for 3 hours in an air environment to obtain a composite oxide. Weigh 10g composite oxide, 13.9gNH 4 h 2 PO 4 , 5.35g LiOH·2H 2 0 and 3g polypropylene powder are batched, and the prepared material is ball milled at 400 rpm for 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, and cooling to room temperature with the f...

Embodiment 2

[0020] Example 2: Weigh 100g of converter copper slag particles (1mm to 8mm in particle size) and 100g of coke (-40 mesh), put them into a graphite crucible, put it in a furnace at 1100°C in an air atmosphere and cover it for roasting for 2 hours, take it out and cool it in air to room temperature. The treated copper slag is ground and magnetically separated to obtain an Fe-based multi-element alloy phase containing various doping elements. XRF test shows that the total molar concentration of doping elements is 6.58%, and the rest is Fe. The obtained Fe-based multi-element alloy phase was oxidized at 600° C. for 2 hours in an air environment to obtain a composite oxide. Weigh 10g composite oxide, 14.5gNH 4 h 2 PO 4 , 5.58g LiOH 2H 2 0 and 3g polypropylene powder are batched, and the prepared material is ball milled at 400 rpm for 2 hours. The ground powder was placed in a ceramic crucible and heated at 650 °C under N 2 Roasting under protection for 10 hours, cooling to r...

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Abstract

The invention discloses a method for preparing polynary doped lithium ferrous phosphate by using copper dreg extract as a main raw material, belonging to the technical field of the preparation of a lithium ion battery anode material. The invention adopts reduction and magnetic separation methods to obtain a Fe-based polynary alloy phase containing a plurality of doping elements from copper dregs and oxidizes the Fe-based polynary alloy phase to obtain a composite oxide which is used as a Fe source and a multi-doping element source and matched with Li and P according to chemical measurement so as to be roasted and synthesized into the polynary doped lithium ferrous phosphate under the protection of inert gases, such as N2 or Ar, and the like. Compared with the prior art, a Fe element and a plurality of doping elements (several or all of Cu, Zn, Al, Co, Ti, Ni, Cr, Mn and Mo) used by the method for preparing the polynary doped lithium ferrous phosphate are all from the copper dregs so as to overcome the limitation that the raw materials for preparing the polynary doped lithium ferrous phosphate only relay on a plurality of chemical reagents, thereby decreasing the preparation cost while providing a new path for utilizing the high added value of a copper dreg resource.

Description

Technical field: [0001] The invention belongs to the technical field of preparation of cathode materials for lithium ion batteries, and in particular relates to a method for preparing multi-element doped lithium iron phosphate by using copper slag extract 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 used to improve LiFePO 4...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04H01M4/36H01M4/58
CPCY02E60/12Y02E60/10
Inventor 吴照金李辽沙岳海峰武杏荣王平
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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