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Preparation method of low-cost low-temperature lithium iron phosphate

A lithium iron phosphate, low temperature technology, applied in chemical instruments and methods, phosphorus compounds, structural parts, etc., can solve the problems of high cost and poor low temperature performance, reduce environmental pressure, good performance, and broad market application prospects Effect

Pending Publication Date: 2020-12-29
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Based on the technical problems existing in the background technology, the present invention proposes a low-cost low-temperature lithium iron phosphate preparation method to solve the problems of high cost and poor low-temperature performance in the preparation of lithium iron phosphate materials for lithium-ion batteries in the prior art

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  • Preparation method of low-cost low-temperature lithium iron phosphate
  • Preparation method of low-cost low-temperature lithium iron phosphate

Examples

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Embodiment 1

[0029] A method for preparing low-cost low-temperature lithium iron phosphate, comprising the following steps:

[0030] S1, transfer the chemical chrome plating waste liquid into the filter tank with a mesh aperture of 50 orders (that is, the aperture is 150 μm) and filter to remove small particle impurities in the waste liquid;

[0031] S2, adding concentration is the photochemical oxidizing agent ozone (O of 3mg / L) in chemical plating waste liquid 3 ), the hypophosphite and phosphite ions in the electroless chrome plating waste liquid are oxidized into orthophosphate ions, and the reaction time is 1.5h;

[0032] S3, in the solution treated in step S2 according to phosphate ion and Fe 3+ Add ferric nitrate at a molar ratio of 1.10:1, after stirring and mixing for 3.5 hours, adjust the pH value to 2.0, and react at a temperature of 65°C;

[0033] S4, subjecting the reacted product to aging, press filtration, washing, and pulping to obtain iron phosphate slurry;

[0034] S5....

Embodiment 2

[0042] A method for preparing low-cost low-temperature lithium iron phosphate, comprising the following steps:

[0043] S1, transfer the chemical chrome plating waste liquid into the filter tank with a mesh aperture of 50 orders (that is, the aperture is 150 μm) and filter to remove small particle impurities in the waste liquid;

[0044] S2, adding concentration to the chemical chrome plating waste liquid is the photochemical oxidant ozone (O 3 ), the hypophosphite and phosphite ions in the electroless chrome plating waste liquid are oxidized into orthophosphate ions, and the reaction time is 1h;

[0045] S3, in the solution treated in step S2 according to phosphate ion and Fe 3+ The molar ratio is 1.15:1, adding ferric chloride, after stirring and mixing for 4 hours, adjust the pH value at 2.5, and react at a temperature of 70°C;

[0046] S4, subjecting the reacted product to aging, press filtration, washing, and pulping to obtain iron phosphate slurry;

[0047] S5. Add li...

Embodiment 3

[0050] A method for preparing low-cost low-temperature lithium iron phosphate, comprising the following steps:

[0051] S1, transfer the chemical chrome plating waste liquid into the filter tank with a mesh aperture of 50 orders (that is, the aperture is 150 μm) and filter to remove small particle impurities in the waste liquid;

[0052] S2, adding concentration to the chemical chrome plating waste liquid is the photochemical oxidant ozone (O 3 ), the hypophosphite and phosphite ions in the electroless chrome plating waste liquid are oxidized into orthophosphate ions, and the reaction time is 2h;

[0053] S3, in the solution treated in step S2 according to phosphate ion and Fe 3+ The molar ratio is 1.08:1, adding ferric sulfate, after stirring and mixing for 3 hours, adjust the pH value at 2.0, and react at a temperature of 60°C;

[0054] S4, subjecting the reacted product to aging, press filtration, washing, and pulping to obtain iron phosphate slurry;

[0055] S5. Add lit...

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Abstract

The invention discloses a preparation method of low-cost low-temperature lithium iron phosphate, and relates to the technical field of lithium ion battery positive electrode materials. The preparationmethod comprises the following steps: filtering a chemical chromium plating waste liquid; adding a photochemical oxidant ozone into the waste liquid, and carrying out a reaction to oxidize hypophosphite ions and phosphite ions in the waste liquid into orthophosphate ions; adding a ferric salt, adjusting the pH value to 2.0-2.5 h, and carrying out a heating reaction; carrying out aging, filter pressing, washing and slurrying treatment on the reaction product to obtain iron phosphate slurry; sequentially adding a lithium source and a carbon source into the iron phosphate slurry, mixing, forminga sand film, and carrying out spray drying to obtain a precursor; and calcining the precursor in a protective atmosphere to obtain the lithium iron phosphate material. According to the method, chemical chromium plating wastewater is used for preparing a lithium iron phosphate positive electrode material, wherein the process is simple, the environmental pressure is reduced, the production cost oflithium iron phosphate is reduced, and the obtained lithium iron phosphate is relatively good in performance and has good ionic conductivity, electronic conductivity and low-temperature resistance.

Description

technical field [0001] The invention relates to the technical field of cathode materials for lithium ion batteries, in particular to a method for preparing low-cost and low-temperature lithium iron phosphate. Background technique [0002] At present, there are many systems that have been studied as cathode materials for lithium-ion batteries, but only lithium cobaltate LiCoO has truly achieved large-scale industrialization. 2 , LiMn 2 o 4 、LiFePO 4 , Ternary composite oxide. Among them, LiCoO 2 Expensive, poor safety performance; LiMn 2 o 4 Compared with LiCoO 2 The raw materials are relatively cheap and the thermal stability of the material is slightly higher, but its capacity is low and its high temperature performance is poor; the new ternary composite oxide Li1 / 3Co1 / 3Mn1 / 3O 2 with LiCoO 2 With the same structure, it has high energy density but poor safety performance, which is a problem that has plagued the entire battery industry and has not been completely res...

Claims

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Application Information

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IPC IPC(8): C01B25/45H01M4/58H01M10/0525
CPCC01B25/45H01M4/5825H01M10/0525C01P2004/03C01P2006/11C01P2006/12C01P2006/42Y02E60/10
Inventor 万宁李萍萍汪伟伟陈峰杨茂萍
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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