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Composite Cu<2+>, Co<2+> and Ag<+>-doped ferric fluoride anode material and preparation method thereof

A composite positive electrode material and iron salt technology, which is applied in the direction of iron halide, battery electrodes, electrical components, etc., can solve the problems of not too good energy density, unsuitable for industrial application, and poor economy, so as to improve the discharge potential and improve Comprehensive electrochemical performance and the effect of improving the conductivity of lithium ions

Inactive Publication Date: 2014-11-19
NINGBO UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the attachment of carbon materials on the surface of positive electrode material particles mainly depends on physical adsorption, and it is difficult to form a complete carbon conductive link.
Here, as mentioned earlier, the discharge voltage of this material is relatively low, and the effective energy density is not too good; finally, because FeF 3 The material is slightly soluble in cold water, so it is usually prepared by the ethanol liquid phase method, which requires a large amount of ethanol during the synthesis process, which is not economical
Not suitable for industrial applications

Method used

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  • Composite Cu&lt;2+&gt;, Co&lt;2+&gt; and Ag&lt;+&gt;-doped ferric fluoride anode material and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0021] Embodiment 1: Fe(NO 3 ) 3 9H 2 O and ammonium fluoride (molar ratio 1.0:3.1) and 3.2% by weight of Cu(C 2 o 4 )·0.5H 2 O, 3% Co(Ac) by weight 2 4H 2 O, 4% AgNO by weight 3 , Tween-80 with a weight percentage of 0.6% and ethanol with a weight percentage of 0.5% were ball milled at room temperature for 5 hours under the protection of high-purity nitrogen in a high-energy ball mill, and then the materials were taken out, under the protection of a mixed gas of 5% hydrogen and 95% argon After heating up to 450 degrees and keeping the temperature for 2 hours, cooling to prepare Cu 2+ ,Co 2+ , Ag + doped modified FeF 3 Cathode material.

Embodiment 2

[0022] Embodiment 2: FeCl 3 ·6H 2 O and ammonium fluoride (molar ratio 1.0:3.6) and 6% by weight of Cu(C 2 o 4 )·0.5H 2 O, the weight percentage is 15% Co (C 2 o 4 )·4H 2 O, 8% by weight AgNO 3 , 0.9% by weight of span-60 and 1.0% by weight of ethanol are ball milled at room temperature for 20 hours under the protection of high-purity nitrogen in a high-energy ball mill, and then the materials are taken out, and the temperature is raised under the protection of a mixed gas of 5% hydrogen and 95% argon After cooling to 400 degrees for 6 hours, the prepared Cu 2+ ,Co 2+ , Ag + doped modified FeF 3 Cathode material.

Embodiment 3

[0023] Embodiment 3: Fe 2 (SO 4 ) 3 9H 2 O and ammonium fluoride (molar ratio 1.0:3.5) and 15% by weight of Cu(NO 3 ) 2 ·3H 2 O, the weight percentage is 8% Co (C 2 o 4 )·4H 2 O, 14% by weight AgNO 3 1.5% by weight of Tween-80 and 2.0% by weight of ethanol were ball milled at room temperature for 10 hours under the protection of high-purity argon in a high-energy ball mill, and then the materials were taken out and protected by a mixed gas of 5% hydrogen and 95% argon. Heat up to 350 degrees and keep the temperature for 8 hours, then cool down to prepare Cu 2+ ,Co 2+ , Ag + doped modified FeF 3 Cathode material.

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Abstract

The invention relates to a composite Cu<2+>, Co<2+> and Ag<+>-doped ferric fluoride anode material and a preparation method thereof. The preparation method comprises the following steps of carrying out ball milling on copper salt, cobalt salt, silver salt and a synthetic raw material in a high-energy ball mill for a period of time and carrying out heat treatment to obtain an FeF3 anode material. By virtue of partially occupying FeF3 iron ligand through Cu<2+>, the improvement of discharge potential is facilitated, and the energy density is improved; by doping Co<2+>, the improvement of the lithium ion conductivity of the material is facilitated; by doping Ag<+>, the activation energy of the conversion reaction during charging is reduced and thus the improvement of the multiplying power characteristic and the energy density is facilitated and the comprehensive electrochemical properties of the material are enhanced.

Description

technical field [0001] The invention relates to the technical field of a method for manufacturing a high-capacity iron fluoride composite lithium battery cathode material. Background technique [0002] Lithium-ion secondary batteries have the absolute advantages of high volume, weight-to-energy ratio, high voltage, low self-discharge rate, no memory effect, long cycle life, and high power density. Currently, the global mobile power market has an annual share of more than 30 billion US dollars and Gradually grow at a rate of more than 10%. Especially in recent years, with the gradual depletion of fossil energy, new energy sources such as solar energy, wind energy, and biomass energy have gradually become alternatives to traditional energy sources. Among them, wind energy and solar energy are intermittent, and a large amount of energy is used simultaneously to meet the needs of continuous power supply. Energy storage batteries; urban air quality problems caused by automobile ...

Claims

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Application Information

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IPC IPC(8): C01G49/10H01M4/58H01M4/62
CPCY02E60/10
Inventor 徐玲霞水淼徐晓萍陈姝郑卫东高珊舒杰冯琳任元龙
Owner NINGBO UNIV
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