Titanium and chromium doped iron fluoride-carbon nanometer composite positive electrode material, and preparation method and application thereof

A carbon nanocomposite, cathode material technology, applied in battery electrodes, electrochemical generators, electrical components, etc., can solve the problems of limited practical application, poor conductivity and kinetic properties of iron fluoride materials, and low material rate performance. , to achieve the effects of excellent rate characteristics and cycle performance, enhanced electrical conductivity, and improved diffusion performance

Active Publication Date: 2016-10-12
深圳鑫茂新能源技术股份有限公司
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Problems solved by technology

However, the poor electrical conductivity and kinetic properties of ferric fluoride materials lead to low material rate performance, which limits its practical applications.

Method used

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  • Titanium and chromium doped iron fluoride-carbon nanometer composite positive electrode material, and preparation method and application thereof
  • Titanium and chromium doped iron fluoride-carbon nanometer composite positive electrode material, and preparation method and application thereof
  • Titanium and chromium doped iron fluoride-carbon nanometer composite positive electrode material, and preparation method and application thereof

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preparation example Construction

[0058] The invention provides a preparation method of a titanium-chromium-doped ferric fluoride-carbon nanocomposite positive electrode material, comprising the following steps:

[0059] 1) react after mixing iron hydrate, chromium hydrate, titanium salt and fluoride to obtain the doped iron fluoride precursor shown in formula I:

[0060] Fe 1-x-y Cr x Ti 0.75y f 3 (H 2 O) 0.33 Formula I;

[0061] Among them, 0.1≤x≤0.2, 0.06≤y≤0.1;

[0062] 2) mixing the doped ferric fluoride precursor with a carbon-containing conductive material and coating to obtain the titanium-chromium-doped ferric fluoride-carbon nanocomposite positive electrode material shown in formula II;

[0063] Fe 1-x-y Cr x Ti 0.75y f 3 (H 2 O) 0.33 @C Formula II;

[0064] Among them, 0.1≤x≤0.2, 0.06≤y≤0.1.

[0065] The present invention adopts a simple and feasible method to realize FeF 3 The synergistic modification of the metal ion lattice doping of the positive electrode material and the coatin...

Embodiment 1

[0083] According to Fe 0.84 Cr 0.1 Ti 0.045 f 3 (H 2 O) 0.33 The molar weights of Fe, Cr, Ti and F in the chemical formula are taken by weighing ferric nitrate (Fe(NO 3 ) 3 9H 2 O), chromium chloride (CrCl 3 ·6H 2 O), titanium nitrate and ammonium fluoride, carry out batching, add appropriate amount of water and ethanol immersion mixture, SiC is auxiliary agent, and its mass ratio with mixture is 0.05:1, at room temperature, under nitrogen protection, in high-energy ball mill with rotating speed 250r / min, ball milling for 10 hours. Take out the ball-milled material, put it into a vacuum tube-type atmosphere furnace protected by argon, raise the temperature to 300°C, keep the temperature constant for 8 hours, and then cool it down to obtain Ti 4+ 、Cr 3+ Doped ferric fluoride precursor.

[0084] Conductive carbon black is mixed with ethylene glycol in a mass ratio of 1:1, and ultrasonically dispersed in ethanol to form a conductive carbon dispersion; the Ti 4+ 、Cr ...

Embodiment 2

[0087] According to Fe 0.77 Cr 0.15 Ti 0.06 f 3 (H 2 O) 0.33 The molar weights of Fe, Cr, Ti and F in the chemical formula are taken by weighing ferric nitrate (Fe(NO 3 ) 3 9H 2 O), chromium chloride (CrCl 3 ·6H 2 O), titanium nitrate and ammonium fluoride, carry out batching, add appropriate amount of water and ethanol immersion mixture, SiC is auxiliary agent, and its mass ratio with mixture is 0.05:1, at room temperature, under nitrogen protection, in high-energy ball mill with rotating speed 350r / min, ball milling for 15 hours. Take out the ball-milled material, put it into a vacuum tube-type atmosphere furnace protected by argon, raise the temperature to 400 ° C, keep the temperature for 10 hours, and then cool it to obtain Ti 4+ 、Cr 3+ Doped ferric fluoride precursor.

[0088] Conductive carbon black is mixed with ethylene glycol in a mass ratio of 1:2, and ultrasonically dispersed in ethanol to form a conductive carbon dispersion; the Ti 4+ 、Cr 3+ The dope...

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Abstract

The invention provides a titanium and chromium doped iron fluoride-carbon nanometer composite positive electrode material, and a preparation method thereof. The material sis prepared through coating a doped iron fluoride precursor with a carbon-containing conductive material, the doped iron fluoride precursor is represented by formula I, and the positive electrode material is represented by formula II. Titanium ions and chromium ions are doped to adjust the crystal lattice parameters of crystals, so the lithium ion diffusion performance is substantially improved, the electricity conduction performance of the material is enhanced, and the specific capacity of the material is improved. The doped iron fluoride precursor is coated and compounded with the carbon-containing conductive material in order to further improve the electricity conduction performance of the material and reduce particle agglomeration. The rate characteristics and the cycle performances of the material are excellent. The invention also provides a lithium ion battery comprising the positive electrode material. The formula I is Fe1-x-yCrxTi0.75yF3(H2O)0.33, and the formula II is represented by Fe1-x-yCrxTi0.75yF3(H2O)0.33@C.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery materials, in particular to a titanium-chromium-doped ferric fluoride-carbon nanocomposite positive electrode material and a preparation method and application thereof. Background technique [0002] As a new energy industry, lithium-ion batteries have been widely used in various portable electronic products due to their absolute advantages such as high working voltage, high energy density, green environmental protection, no memory effect, low self-discharge rate, long cycle life and stable discharge performance. , new energy vehicles and other fields. At present, mineral resources are gradually depleted and environmental pollution is increasing. Exploring alternative and non-polluting new energy sources is an urgent problem to be solved. Although renewable energy such as solar energy, wind energy, water energy, and biomass energy have made great progress, high costs and geographical r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/136H01M4/1397H01M10/0525
CPCH01M4/136H01M4/1397H01M10/0525Y02E60/10
Inventor 李军黄思潘春阳许帅军李少芳
Owner 深圳鑫茂新能源技术股份有限公司
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