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Preparation of nano-ferric fluoride and application of nano-ferric fluoride to positive electrode of high-specific-capacity lithium ion battery

An iron fluoride and nanotechnology, applied in battery electrodes, iron halide, nanotechnology, etc., can solve the problems of low conductivity, limited rate performance, etc., and achieve the effects of high yield, excellent electrochemical performance, and simple operation.

Inactive Publication Date: 2016-06-15
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, in ferric fluoride, fluorine atoms and iron atoms are linked together by ionic bonds, resulting in low electrical conductivity, which limits its rate performance.

Method used

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  • Preparation of nano-ferric fluoride and application of nano-ferric fluoride to positive electrode of high-specific-capacity lithium ion battery
  • Preparation of nano-ferric fluoride and application of nano-ferric fluoride to positive electrode of high-specific-capacity lithium ion battery
  • Preparation of nano-ferric fluoride and application of nano-ferric fluoride to positive electrode of high-specific-capacity lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0028] (1) 0.1mol of Fe(NO 3 ) 3 9H 2 O was dissolved in 1L ethanol with a concentration of 1mol, and a colorless transparent solution was obtained under the action of ultrasound.

[0029] (2) 0.3mol of NH 4 HF 2 Dissolve in 1L deionized water, (NH 4 )HF 2 with Fe(NO 3 ) 3 9H 2 The mass ratio of O was 20:1.

[0030] (3) Pour the aqueous solution obtained in (2) into the ethanol solution obtained in (1), and stir vigorously for 1 min to obtain (NH 4 ) 3 FeF 6 White precipitate.

[0031] (4) The white precipitate in (3) was obtained by centrifugation, washed three times with ethanol, and dried in vacuum at 60°C for 12h to obtain (NH 4 ) 3 FeF 6 White powder.

[0032] (5) (NH obtained in (4) 4 ) 3 FeF 6 The white powder is heated at 400°C for two hours under an argon atmosphere to obtain FeF 3 nanomaterials.

[0033] Above is FeF 3 Preparation of nanomaterials.

[0034] (6) FeF obtained in (5) 3 Nanomaterials, acetylene black, and polyvinylidene fluoride a...

example 2

[0045] (1) 0.1mol of Fe(NO 3 ) 3 9H 2 O was dissolved in 1L ethanol with a concentration of 2mol, and a colorless transparent solution was obtained under the action of ultrasound.

[0046] (2) 0.3mol of NH 4 HF 2 Dissolve in 1L deionized water, NH 4 HF2 with Fe(NO 3 ) 3 9H 2 The mass ratio of O was 10:1.

[0047] (3) Pour the aqueous solution obtained in (2) into the ethanol solution obtained in (1), and stir vigorously for 1 min to obtain (NH 4 ) 3 FeF 6 White precipitate.

[0048] (4) The white precipitate in (3) was obtained by centrifugation, washed three times with ethanol, and dried in vacuum at 60°C for 12h to obtain (NH 4 ) 3 FeF 6 White powder.

[0049] (5) (NH obtained in (4) 4 ) 3 FeF 6 The white powder is heated at 400°C for two hours under an argon atmosphere to obtain FeF 3 nanomaterials.

[0050] Above is FeF 3 Preparation of nanomaterials.

[0051] (6) FeF obtained in (5) 3 Nanomaterials, acetylene black, and polyvinylidene fluoride are m...

example 3

[0057] (1) 0.1mol of Fe(NO 3 ) 3 9H 2 O was dissolved in 1L ethanol with a concentration of 3mol, and a colorless transparent solution was obtained under the action of ultrasound.

[0058] (2) 0.3mol of NH 4 HF 2 Dissolve in 1L deionized water, NH 4 HF 2 with Fe(NO 3 ) 3 9H 2 The mass ratio of O is 5:1.

[0059] (3) Pour the aqueous solution obtained in (2) into the ethanol solution obtained in (1), and stir vigorously for 1 min to obtain (NH 4 ) 3 FeF 6 White precipitate.

[0060] (4) The white precipitate in (3) was obtained by centrifugation, washed three times with ethanol, and dried in vacuum at 60°C for 12h to obtain (NH 4 ) 3 FeF 6 White powder.

[0061] (5) (NH obtained in (4) 4 ) 3 FeF 6 The white powder is heated at 400°C for two hours under an argon atmosphere to obtain FeF 3 nanomaterials.

[0062] Above is FeF 3 Preparation of nanomaterials.

[0063] (6) FeF obtained in (5) 3 Nanomaterials, acetylene black, and polyvinylidene fluoride are m...

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Abstract

The invention relates to preparation of nano-ferric fluoride and an application of the nano-ferric fluoride to a positive electrode of a high-specific-capacity lithium ion battery. A preparation method of the nano-ferric fluoride comprises the following steps: preparing a Fe(NO<3>)<3>.9H<2>O ethanol solution, and obtaining a colorless transparent solution under an ultrasonic action; preparing a deionized water solution of NH<4>HF<2>; mixing the solutions to obtain (NH<4>)<3>FeF<6> white precipitate; performing centrifugal separation on the white precipitate, cleaning the centrifugally-separated white precipitate and drying the cleaned white precipitate to obtain (NH<4>)<3>FeF<6> white powder; and calcining the (NH<4>)<3>FeF<6> white powder to obtain a FeF<3> nanometer material. A positive electrode of a high-specific-power lithium ion battery is prepared from the FeF<3> nanometer material. The preparation method has the advantages of easiness in operation, low cost, high yield, simple posttreatment, no need of any special reaction instrument and low preparation cost. FeF3 nanometer materials of different grain sizes can be obtained in a way of easily regulating and controlling a volume ratio of ethanol to deionized water. The electrode has superior electrochemical performance in the lithium ion battery.

Description

technical field [0001] The invention relates to a method for preparing nanometer ferric fluoride by using ammonium hexafluoroferrate as a precursor and the preparation of the cathode material of lithium ion batteries. Specifically, ammonium hexafluoroferrate is pyrolyzed into ferric fluoride in an inert atmosphere, and applied to lithium primary batteries, which belongs to the technical field of energy storage materials. Background technique [0002] As an energy storage device, lithium-ion batteries have the characteristics of high working voltage, large specific energy, long cycle life, good safety, small self-discharge, wide operating temperature range and fast charging and discharging. At present, lithium-ion batteries have been widely used in fields such as electric vehicles, electrical equipment, and backup power supplies. At present, the capacity of the commercial lithium-ion battery system is close to its theoretical capacity, and it is difficult to make a breakthro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M10/0525H01M4/1397B82Y30/00C01G49/10
CPCB82Y30/00C01G49/10H01M4/1397H01M4/582H01M10/0525Y02E60/10
Inventor 封伟高毅李瑀冯奕钰
Owner TIANJIN UNIV
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