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Phosphate-coated nano-grade lithium iron phosphate cathode material and preparation method thereof

A cathode material, phosphate technology, applied in battery electrodes, electrical components, circuits, etc., can solve problems such as poor kinetic performance, and achieve the effects of cheap raw materials, easy availability of raw materials, and convenient manufacturing process operations.

Inactive Publication Date: 2012-12-26
BEIJING CENT PRESS UNION TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

LiFePO at room temperature 4 The electronic conductance is also much lower than other cathode materials, about 10 -9 S / cm, thus resulting in LiFePO 4 The dynamic performance is very poor

Method used

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  • Phosphate-coated nano-grade lithium iron phosphate cathode material and preparation method thereof
  • Phosphate-coated nano-grade lithium iron phosphate cathode material and preparation method thereof
  • Phosphate-coated nano-grade lithium iron phosphate cathode material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0017] According to iron, phosphorus, lithium, aluminum molar ratio is 1: 1.05: 1.1: 0.05, take ferric phosphate, lithium carbonate, aluminum phosphate and mix, add to the water-based solvent that contains mass fraction and be 4% PVP ball mill, milling speed is 1500r / min, ball milling 2h. The slurry was transferred to an 80°C drying oven for vacuum drying, and the dried precursor was transferred to an inert atmosphere protection furnace with nitrogen protection, and the temperature was raised to 350°C at a rate of 5°C / min. The heating rate of ℃ / min is raised to 700℃, kept for 18h, and LiAlP is obtained after cooling 2 o 7 Coated Nano LiFePO 4 Lithium-ion battery cathode material.

[0018] figure 1 It is a scanning electron microscope picture of the obtained sample. It can be seen from the figure that the obtained sample particles are uniform and fine, and the primary particle is about 100nm. figure 2 is LiAlP obtained by the above method 2 o 7 Coated Nano LiFePO 4 Li...

Embodiment 2

[0020] According to the iron, phosphorus, lithium, aluminum molar ratio of 1:1:1.02:0.01, weigh iron phosphate, lithium carbonate, aluminum oxide (or aluminum acetate, aluminum nitrate) and mix, add to the aqueous solvent containing 3.5% PEG by mass fraction Medium ball milling, the grinding speed is 800r / min, ball milling 10h. The slurry was transferred to an 80°C drying oven for vacuum drying, and the dried precursor was transferred to an inert atmosphere protection furnace with nitrogen protection, and the temperature was raised to 350°C at a rate of 8°C / min. The heating rate of ℃ / min is raised to 710℃, kept for 14h, and LiAlP is obtained after cooling 2 o 7 Coated Nano LiFePO 4 Lithium-ion battery cathode material. image 3 is LiAlP obtained by the above method 2 o 7 Coated Nano LiFePO 4 Lithium-ion battery cathode material different discharge rate capacity test curve, 0.1C, 0.2C discharge capacity is 155mAhg -1 , 0.5C, 1C, 2C, 5C discharge capacity is 148mAhg -1 ,...

Embodiment 3

[0022] According to the molar ratio of iron, phosphorus, lithium and vanadium as 1:1.05:1.1:0.05, weigh ferric oxide, lithium dihydrogen phosphate, lithium vanadate and vanadium pentoxide and mix them until the mass fraction is 3% polyacrylamide was ball milled in an aqueous solvent, the milling speed was 1000r / min, and the milling time was 10h. Transfer the slurry to spray drying, the inlet temperature during spraying is 170°C, the outlet is 80°C, the pump speed is 15Hz, and the nozzle speed is 45Hz. And transfer the dried precursor to an inert atmosphere protection furnace, pass nitrogen protection, raise the temperature to 400°C at a rate of 2°C / min, keep it warm for 8 hours, then raise the temperature to 720°C at a rate of 8°C / min, keep it warm 12h, Li was obtained after cooling 3 V 2 (PO4 ) 3 Coated Nano LiFePO 4 Lithium-ion battery cathode material.

[0023] Li obtained by the above method 3 V 2 (PO 4 ) 3 Coated Nano LiFePO 4 Coated Nano LiFePO 4 Lithium-ion b...

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Abstract

The invention relates to a phosphate-coated nano-grade lithium iron phosphate cathode material and a preparation method thereof. The invention belongs to the field of energy materials, and especially relates to the field of lithium ion battery cathode materials. The invention provides coated-type nano-grade LiFePO4 with phosphate or pyrophosphate coated on the surface, and a preparation method thereof. According to the type of materials, a lithium source compound, an iron source compound, a phosphorus source compound, and an aluminum source compound (a vanadium source compound) are adopted as raw materials; the raw materials are mixed and dispersed; and a high-temperature solid-phase method is adopted, such that a phosphate or pyrophosphate amorphous film with good lithium ion conductivity is formed on the surface of nano-grade LiFePO4. With the material, Li<+> can be easily conducted to the surface of crystal grains, such that Li<+> migration ability is improved, and the dynamic performance of the LiFePO4 material can be greatly improved.

Description

Technical field: [0001] The invention belongs to the technical field of green energy materials, and in particular relates to a lithium iron phosphate material for lithium ion batteries and a manufacturing method thereof. Background technique: [0002] Lithium-ion battery is currently a portable chemical power source with the highest specific energy. It has the advantages of high output voltage, stable discharge voltage, high energy density, low self-discharge rate, and long storage and working life. With the miniaturization of today's electronic equipment and the rapid development of electric tools, the research and application of lithium-ion batteries are getting more and more attention. For current lithium-ion batteries, the positive electrode material is one of the key materials of lithium-ion batteries as the source of lithium ions. At present, the positive electrode materials used in lithium-ion batteries are mainly lithium transition metal oxides, including LiCoO with...

Claims

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Application Information

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IPC IPC(8): H01M4/58H01M4/1397
CPCY02E60/122Y02E60/10
Inventor 马平平夏定国刘振刚陈宇胡朴
Owner BEIJING CENT PRESS UNION TECH
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