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Low-temperature type lithium iron phosphate anode material and preparation method thereof

A technology of lithium iron phosphate and cathode material, applied in battery electrodes, electrical components, circuits, etc., can solve problems such as high cost, unfavorable industrial production, complex process, etc., to improve electrical conductivity, facilitate de-intercalation, and reduce diffusion paths. Effect

Inactive Publication Date: 2012-03-14
SHANDONG GOLDENCELL ELECTRONICS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, in the laboratory hydrothermal synthesis method, carbon coating and metal doping can effectively refine the material particles, improve the electrical conductivity of the material, and thereby improve the low-temperature performance of the material, but the hydrothermal synthesis method is complex and costly. High, not conducive to the realization of industrial production

Method used

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  • Low-temperature type lithium iron phosphate anode material and preparation method thereof
  • Low-temperature type lithium iron phosphate anode material and preparation method thereof
  • Low-temperature type lithium iron phosphate anode material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0033] The ratio of lithium carbonate, magnesium oxide, iron phosphate and glucose is based on the molar ratio of Li:Mg:Fe:P:C=1.09: 0.01:1:1:0.8 (C is C in glucose) and then directly mixed with the above mixture Anhydrous ethanol with a mass of 2.5 times is ball milled in a planetary ball mill for 10 hours. Both the ball mill pot and the balls are made of zirconia, the diameter of the balls is 10 mm, and the weight ratio of the mixed wet material to the balls is 1:0.8. The speed of revolution is 100r / min, and the speed of rotation is 800r / min. After ball milling, the slurry is dried, pulverized, granulated, and calcined in an inert atmosphere furnace at 300°C for 5h in a loose state, and cooled to room temperature. Put the powder on the surface with a pressure of 10kg / cm3 In the compacted state, calcined at 800°C for 8 hours in an inert atmosphere furnace, and the synthesized material was subjected to airflow crushing and classification. The median particle size was controlled...

Embodiment 2

[0038] The ratio of lithium carbonate, magnesium oxide, iron phosphate and glucose is based on the molar ratio Li:Mg:Fe:P:C=1.08: 0.02:1:1:0.8 (C is C in glucose) and then directly mixed with the above mixture Anhydrous ethanol with a mass of 2.5 times is ball milled in a planetary ball mill for 10 hours. Both the ball mill pot and the balls are made of zirconia, the diameter of the balls is 10 mm, and the weight ratio of the mixed wet material to the balls is 1:2. The speed of revolution is 200r / min, and the speed of rotation is 800r / min. After ball milling, the slurry is dried, pulverized and granulated. In a loose state, it is calcined in an inert atmosphere furnace at 500°C for 2 hours and cooled to room temperature. Put the powder on the surface with a pressure of 10kg / cm 3 In the compacted state, calcined in an inert atmosphere furnace at 700°C for 10 hours, and the synthesized material was subjected to airflow crushing and classification. The median particle size was co...

Embodiment 3

[0040] The ratio of lithium carbonate, magnesium oxide, iron phosphate and glucose is based on the molar ratio of Li: Mg:Fe:P:C=1.07:0.03:1:1:0.8 (C is C in glucose) and directly mixed with the above mixture Anhydrous ethanol with a mass of 2.5 times is ball milled in a planetary ball mill for 10 hours. Both the ball mill pot and the balls are made of zirconia, the diameter of the balls is 10 mm, and the weight ratio of the mixed wet material to the balls is 1:3. The speed of revolution is 300r / min, and the speed of rotation is 600r / min. After ball milling, the slurry is dried, pulverized, granulated, and calcined in an inert atmosphere furnace at 400°C for 3h in a loose state, and cooled to room temperature. Put the powder on the surface with a pressure of 10kg / cm 3 In the compacted state, calcined in an inert atmosphere furnace at 600°C for 12 hours, and the synthesized material was subjected to airflow crushing and classification. The median particle size was controlled at ...

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Abstract

The invention provides a low-temperature type lithium iron phosphate anode material and a preparation method of the low-temperature type lithium iron phosphate anode material. The method comprises the following steps of: proportioning lithium carbonate, metallic oxide, iron phosphate and glucose according to the molar ratio as follows: Li: R: Fe: P: C= (1.1-x): x: 1: 1: 0.8, wherein x=0.01-0.03, C is C in the glucose, and R is a doped metal ion; directly mixing, adding absolute ethyl alcohol of which the gross weight is 2-3 times as heavy as the gross weight of the mixture; ball-milling by means of wetting phase, and evenly mixing; drying, smashing and pelleting the ball-milled sizing agent; calcinating for 2-5h under the temperature of 300-500 DEG C in an inert atmosphere furnace under the status of open setting; cooling to be room temperature; calcinating the power for 8-12h under the temperature of 500-800 DEG C in the inert atmosphere furnace under the compacting status that the surface pressure is 10kg / cm<3>; and secondarily sintering and synthesizing so as to obtain the lithium iron phosphate anode material. The synthesized material is classified and screened by means of fluid energy milling to obtain the nanometer-level lithium iron phosphate anode material, wherein the material is good in electrical conductivity, and the low-temperature performance of a manufactured battery can be effectively improved.

Description

technical field [0001] The invention belongs to the technical field of lithium ion battery materials, and relates to a low-temperature lithium iron phosphate cathode material and a preparation method thereof. Background technique [0002] Lithium iron phosphate, as a cathode material for lithium-ion batteries, has the advantages of rich resources, low price, non-hygroscopicity, non-toxicity, environmental friendliness, good thermal stability, and high safety. It has become a lithium-ion cathode material with great development prospects, especially in There are huge advantages in power batteries. However, lithium iron phosphate has the problem of low conductivity, especially at low temperatures, the conductivity of lithium iron phosphate materials drops sharply, resulting in poor low-temperature discharge performance of lithium iron phosphate lithium-ion batteries, which hinders the development of iron phosphate to a large extent. Further practical application of lithium mat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/58
CPCY02E60/10
Inventor 张敬捧关成善宗继月
Owner SHANDONG GOLDENCELL ELECTRONICS TECH
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