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High-performance hybrid crystal system ferric fluoride positive electrode material and preparation method thereof

A cathode material and mixed crystal technology, applied in the field of high-performance mixed crystal iron fluoride cathode material and its preparation, can solve the problems of high energy consumption, complex and harsh preparation process conditions, poor electrochemical performance, etc., and achieve low energy consumption , the preparation process is simple, the time-consuming effect is short

Active Publication Date: 2015-05-06
SHANDONG YUHUANG NEW ENERGY TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is for FeF with hexagonal crystal structure 3 The positive electrode material has the problems of complicated and harsh preparation process conditions, high energy consumption, and poor electrochemical performance. A mixed crystal system of orthorhombic and tetragonal crystal system high-performance iron fluoride positive electrode material and its preparation method are provided.

Method used

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  • High-performance hybrid crystal system ferric fluoride positive electrode material and preparation method thereof
  • High-performance hybrid crystal system ferric fluoride positive electrode material and preparation method thereof
  • High-performance hybrid crystal system ferric fluoride positive electrode material and preparation method thereof

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Effect test

Embodiment 1

[0027] Prepare 40 mL of 0.5 mol / L ferric nitrate (Fe(NO 3 ) 3 9H 2O) water / ethanol mixed solution (the volume ratio of ethanol and water is 2:1), and 0.02mol oleic acid is added thereto; It is the water / the Ethanol solution (the volume ratio of ethanol to water is 2:1), then add 0.01g polyethylene glycol (molecular weight: 20000) to the two solutions respectively, ultrasonic the two solutions for 30min respectively, and then mix the two solutions at room temperature and pressure Stir at a constant speed for 2 h. The supernatant was discarded by centrifugation, and the precipitate was repeatedly washed with ethanol several times, and dried at 60°C for 8 hours to obtain the target product FeF 3 (H 2 O) 0.33 / β-FeF 3 ·3H 2 O.

Embodiment 2

[0029] Prepare 40 mL of 0.6 mol / L ferric chloride (FeCl 3 ·6H 2 O) water / ethanol solution (the volume ratio of ethanol and water is 3:1), and 0.025mol oleic acid is added thereto; It is the water / ethanol solution of 1mol / L ammonium bifluoride ( The volume ratio of ethanol to water is 3:1), then add 0.02g polyethylene glycol (molecular weight: 20000) to the two solutions respectively, ultrasonicate the two solutions for 30min respectively, then mix the two solutions, stir at a constant speed under normal temperature and pressure 4 h. The supernatant was discarded by centrifugation, and the precipitate was repeatedly washed with ethanol several times, and dried at 60°C for 12 hours to obtain the target product FeF 3 (H 2 O) 0.33 / β-FeF 3 ·3H 2 O.

Embodiment 3

[0031] Prepare 40 mL of 0.5 mol / L ferric nitrate (Fe(NO 3 ) 3 9H 2 O) water / ethylene glycol mixed solution (the volume ratio of ethylene glycol to water is 3:1), and 0.025mol oleic acid is added thereto; prepare 20 mL concentration of 1mol / L fluoride at a molar ratio of 1:3 Water / ethylene glycol mixed solution of ammonium (the volume ratio of ethylene glycol to water is 3:1), then add 0.01g polyethylene glycol (molecular weight 20000) to the two solutions respectively, and ultrasonicate the two solutions for 30min respectively, and then The two solutions were mixed and stirred at a constant speed for 2 h at room temperature and pressure. The supernatant was discarded by centrifugation, and the precipitate was repeatedly washed with ethanol several times, and dried at 60°C for 8 hours to obtain the target product FeF 3 (H 2 O) 0.33 / β-FeF 3 ·3H 2 O.

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Abstract

The invention in particular relates to a high-performance hybrid crystal system ferric fluoride positive electrode material and a preparation method thereof. The positive electrode material is prepared from a water / alcohol mixed solution containing a ferric salt and a fluorine-containing water / alcohol mixed solution. The preparation method is performed under normal temperature and normal pressure, the preparation process is simple, and the method is low in time consumption, low in energy consumption, low in cost, environment-friendly and easy for industrial production; and the prepared hybrid crystal system FeF3(H2O)0.33 / beta-FeF3.3H2O nanoparticles have high specific discharge capacity, low cost, environment friendliness, high rate capability and excellent cycling stability and have actual application prospects in the fields of power supplies and battery energy storage.

Description

(1) Technical field [0001] The invention relates to a lithium-ion secondary battery cathode material, in particular to a high-performance mixed crystal iron fluoride cathode material and a preparation method thereof. (2) Background technology [0002] Compared with traditional lead-acid and nickel-metal hydride batteries, lithium-ion secondary batteries have the advantages of light weight, environmental protection, long life, large capacity and high safety. It has established unparalleled leading advantages in the field of portable electronic products such as mobile phones, notebook computers, and digital cameras, and is actively developing into the fields of electric tools, electric vehicles, UPS equipment, and national defense. [0003] The development of high-performance lithium-ion batteries depends on the technological progress of cathode materials, which directly affect important performances such as battery capacity, life, cost, and safety. The development of new cat...

Claims

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Application Information

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IPC IPC(8): C01G49/10H01M4/58
CPCY02E60/10
Inventor 乔文灿宋春华王胜伟王瑛王文阁赵成龙陈欣
Owner SHANDONG YUHUANG NEW ENERGY TECH
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