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Method for preparing lithium iron phosphate nano material

A technology of lithium iron phosphate and nanomaterials, applied in nanostructure manufacturing, nanotechnology, nanotechnology, etc., can solve difficult problems such as increasing solid content, achieve significant modification effect, good processing performance and electrochemical performance, and easy operation simple effect

Inactive Publication Date: 2010-12-15
宁波艾能锂电材料科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] At present, in the preparation process of lithium iron phosphate materials, people usually use water, ethanol, acetone, etc. as dispersants. These dispersants are cheap and convenient to use, but it is difficult to increase the solid content of the material to more than 35% and keep it high. liquidity

Method used

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  • Method for preparing lithium iron phosphate nano material
  • Method for preparing lithium iron phosphate nano material
  • Method for preparing lithium iron phosphate nano material

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Select ferric phosphate, lithium hydroxide and magnesium acetate as raw materials, weigh them in a molar ratio of 1:1.02:0.01 and place them in an aqueous solution, add 20wt% glucose, the solid content reaches 50%, and the concentration is 1% of the mass of the precursor TH-904, mixed uniformly in a high-energy ball mill, spray-dried, and placed in an argon atmosphere furnace for heat treatment at 350°C for 2 hours, then heat-treated at 700°C for 20 hours and then cooled to room temperature to obtain the desired lithium iron phosphate material. Among them, TH-904 is a water dispersant produced by Shandong Taihe Water Treatment Co., Ltd.

[0028] The obtained lithium iron phosphate material has a capacity of 150mAh / g and a tap density of 1.2g / ml. The viscosity-shear force relationship is as follows figure 1 As shown in b, its SEM image is shown in figure 2 shown.

Embodiment 2

[0030] Select ferric phosphate, lithium hydroxide and magnesium acetate as raw materials, weigh them in a molar ratio of 1:1.02:0.01 and place them in an aqueous solution, add 20wt% glucose, the solid content reaches 50%, and add 20% of the mass of the precursor TH- 904, mixed uniformly in a high-energy ball mill, spray-dried, and placed in an argon atmosphere furnace for heat treatment at 350°C for 2h, then heat-treated at 700°C for 20h and cooled to room temperature to obtain the desired lithium iron phosphate material.

[0031] The obtained lithium iron phosphate material has a capacity of 155mAh / g and a tap density of 1.3g / ml.

Embodiment 3

[0033] Select iron phosphate, lithium hydroxide and chromium oxide as raw materials, weigh them according to the molar ratio of 1:1.02:0.01, and place them in absolute ethanol solution, add 20wt% glucose, the solid content reaches 50%, and add 0.01% of the mass of the precursor TH-908, mixed uniformly in a high-energy ball mill, spray-dried, and placed in an argon atmosphere furnace for heat treatment at 350°C for 2h, then heat-treated at 700°C for 20h and cooled to room temperature to obtain a chromium-doped lithium iron phosphate material . TH-908 is a ceramic dispersant produced by Shandong Taihe Water Treatment Co., Ltd.

[0034] The obtained lithium iron phosphate material has a capacity of 150mAh / g and a tap density of 1.1g / ml.

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Abstract

The invention relates to a method for preparing a lithium iron phosphate material, which is characterized in that: a dispersant in an amount which is 0.01 to 20 percent based on the mass of the precursor used for preparing the lithium iron phosphate is added into the precursor; and after, mixing, dispersing, drying and heat treatment, the high-performance lithium iron phosphate nano material is obtained; the dispersant is one or more of polyaminoamidophosphate, product of addition of fatty acid and epoxyethane, polyethylene glycol polyol, phosphate, polycarboxylic acids, organic phosphorus single-preparation antiincrustation corrosion inhibitors, organic phosphate, polycarboxylic acid antiscale dispersants, water treatment dispersant and dye dispersant; and the precursor may be a lithium-containing precursor, an iron-containing precursor or phosphor-containing precursor. When the method is adopted, the solid content of the precursor of the lithium iron phosphate material can be improved to over 35 percent, the high flowability of the precursor of the lithium iron phosphate material is maintained, and after the heat treatment, the impurity content is controllable. The lithium iron phosphate nano material has a spherical micro-nano structure, high tap density and high material processing performance.

Description

technical field [0001] The invention relates to the technical field of energy storage materials, in particular to a method for preparing lithium iron phosphate nanomaterials. Background technique [0002] Cathode materials are the key to lithium-ion batteries, especially power lithium-ion batteries. Traditional cathode materials mainly include lithium cobaltate, lithium manganate, and ternary materials. Lithium Cobalt Oxide LiCoO with Layered Structure 2 Explosive at 150°C, poor safety, high cost, the price of cobalt is about 500,000 yuan / ton, LiCoO containing 60% cobalt 2 More than 400,000 yuan / ton, the cycle life is short. Lithium manganate (LiMnO) with a spinel structure 2 o 4 ) is safer than LiCoO 2 Much better, but only 500 cycles poorer at high temperatures. In 1997, Professor John.B.Goodenough first discovered lithium iron phosphate LiFePO 4 Lithium ions in Li have intercalation / extraction reversibility and can be used as cathode materials for lithium batteries...

Claims

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Application Information

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IPC IPC(8): C01B25/45B82B3/00H01M4/1397
CPCY02E60/122Y02E60/10
Inventor 刘兆平唐长林马池张建刚王永强
Owner 宁波艾能锂电材料科技股份有限公司
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