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Cobalt-doped carbon-coated ferric fluoride anode material and preparation method thereof

A cathode material, iron fluoride technology, applied in battery electrodes, electrical components, circuits, etc., can solve problems such as poor electrochemical cycle performance, and achieve the effects of low cost, excellent electrochemical cycle performance, and easy industrial promotion.

Inactive Publication Date: 2012-08-01
XIANGTAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0018] The technical problem to be solved by the present invention is: for FeF 3 (H 2 O) 0.33 The existing problem of poor electrochemical cycle performance provides a cobalt-doped carbon-coated iron fluoride positive electrode material and a preparation method thereof

Method used

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  • Cobalt-doped carbon-coated ferric fluoride anode material and preparation method thereof
  • Cobalt-doped carbon-coated ferric fluoride anode material and preparation method thereof
  • Cobalt-doped carbon-coated ferric fluoride anode material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0033] Weigh Fe according to the molar ratio of n(Fe):n(Co)=0.95:0.05 2 o 3 and Co 2 o 3 About 10g, after mixing evenly, add 40wt% HF at a molar ratio of 1:4 under normal temperature and constant stirring, put it into a sealed polytetrafluoroethylene container, and stir at 25°C for 4h. Then the temperature was raised to 75° C. to fully react until a pink solid was formed. The obtained material was washed with ethanol three times and dried at 60° C. in an air atmosphere for 10 h, and then the material was vacuum-dried at 160° C. for 5 h. Obtain Fe with a purity greater than 96% 0.95 co 0.05 f 3 (H 2 O) 0.33 product, mix it with 15wt% acetylene black, ball mill for 3h, keep vacuum at 150°C for 6h, and pass through a 400-mesh sieve to obtain Fe 0.95 co 0.05 f 3 (H 2 O) 0.33 / C Composite.

Embodiment 2

[0035] Weigh Fe according to the molar ratio of n(Fe):n(Co)=0.97:0.03 2 o 3 and Co 3 o 4 About 10g, after mixing evenly, add 30wt%% HF at a molar ratio of 1:6 under normal temperature and constant stirring, put it into a sealed polytetrafluoroethylene container, and stir at 30°C for 3h. Then the temperature was raised to 80°C to fully react until a gray-black solid was formed. The obtained material was washed with ethanol three times and dried at 80°C in an air atmosphere for 6 hours, and then the material was vacuum-dried at 170°C for 4 hours. Obtain Fe with a purity greater than 96% 0.97 co 0.03 f 3 (H 2 O) 0.33 product, mix it with 20wt% acetylene black, ball mill for 3h, keep vacuum at 160°C for 5h, and pass through a 400-mesh sieve to obtain Fe 0.97 co 0.03 f 3 (H 2 O) 0.33 / C Composite.

Embodiment 3

[0037] Weigh industrial Fe(OH) according to the molar ratio of n(Fe):n(Co)=0.92:0.08 3 and CoCO 3 About 10 g was added with 20 wt% HF at a molar ratio of 1:8, put into a sealed polytetrafluoroethylene container, and stirred at 25°C for 6 hours to make it evenly mixed. Then the temperature was raised to 75° C. to fully react until a pink solid was formed. The obtained material was washed with ethanol three times and dried at 80° C. for 6 h in an air atmosphere, and then vacuum-dried at 180° C. for 2 h. The product is taken out, pulverized, and passed through a 400-mesh sieve to obtain Fe with a purity greater than 96%. 0.92 co 0.08 f 3 (H 2 O) 0.33 product. It was ball milled with 15wt% acetylene black for 3 hours, kept in vacuum at 180°C for 2 hours, and passed through a 400-mesh sieve to obtain Fe 0.92 co 0.08 f 3 (H 2 O) 0.33 / C Composite.

[0038] Such as figure 1 As shown, it can be seen from the figure that the prepared Fe 0.95 co 0.05 f 3 (H 2 O) 0.33 T...

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Abstract

The invention discloses a cobalt-doped carbon-coated ferric fluoride anode material and a preparation method thereof. The chemical formula of the ferric fluoride anode material of the cobalt coated carbon is Fe(1-x)CoxF3(H2O)0.33 / C. The preparation method comprises the steps of adding iron source and cobalt source at the normal temperature into a hydrogen fluoride solution, and stirring the mixture to react in a sealed teflon reactor; continuously stirring the hydrogen fluoride solution to react after the temperature is raised, carrying out sucking and filtering, washing the obtained product with ethanol, drying the obtained product after washing, and carrying out heat treatment in vacuum to obtain cobalt-doped ferric fluoride powder; and pelletizing the cobalt-doped ferric fluoride powder and acetylene black, and carrying out heat treatment in vacuum to obtain the cobalt-doped carbon-coated ferric fluoride anode material. The preparation method disclosed by the invention has the following technical effects that (1) the prepared Fe(1-x)CoxF3(H2O)0.33 / C has a complete orthorhombic system structure, the grain diameter of the ferric fluoride anode material of the cobalt coated carbon is small, and the ferric fluoride anode materials of the cobalt coated carbon are uniformly distributed; (2) the materials of Fe(1-x)CoxF3(H2O)0.33 / C has favorable electrochemical cycling performance; and (3) the preparation method has the advantages of low required temperature and low cost, and is easy to industrially popularize.

Description

technical field [0001] The invention mainly discloses a cobalt-doped and carbon-coated ferric fluoride positive electrode material and a preparation method thereof, and the material can be used as a lithium ion battery positive electrode material. Background technique [0002] Energy is the driving force for the development of the national economy, and it is also an important indicator to measure the comprehensive national strength of the country, the degree of development of the country's civilization and the living standards of the people. The development of human society is inseparable from the emergence of high-quality energy and the use of advanced energy technologies. In today's world, energy and the environment are common concerns of the whole world and all mankind. Chemical power sources (batteries) have become ideal alternative energy sources because of their convenience, low price and environmental friendliness. With the development of high technology and the impro...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/58
CPCY02E60/12Y02E60/10
Inventor 刘黎周萌王先友田方华郭海鹏舒洪波
Owner XIANGTAN UNIV
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