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Mixed crystal form ferric fluoride cathode material and preparation method thereof

A cathode material, iron fluoride technology, applied in battery electrodes, electrical components, circuits, etc., can solve the problems of poor electrochemical cycle performance and complex preparation process, achieve excellent electrochemical performance, good repeatability, and improve mass ratio. Effects of Capacity and Thermal Stability

Active Publication Date: 2013-06-12
XIANGTAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The technical problem to be solved by the present invention is: for FeF with hexagonal crystal structure 3 The existing problems of complex preparation process and poor electrochemical cycle performance provide a mixed crystal ferric fluoride cathode material of cubic and orthorhombic systems and a preparation method thereof

Method used

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  • Mixed crystal form ferric fluoride cathode material and preparation method thereof
  • Mixed crystal form ferric fluoride cathode material and preparation method thereof
  • Mixed crystal form ferric fluoride cathode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Weigh 4.8518g FeNO 3 9H 2 O, add 25mL of absolute ethanol, stir and dissolve, under normal temperature and constant stirring, slowly add 40wt% HF at a molar ratio of 1:4, put it into a sealed polytetrafluoroethylene container, stir at room temperature for 0.5h, and move to In a hydrothermal reaction kettle, conduct a hydrothermal reaction at 60°C for 24 hours to obtain a pink precipitate, pour off the supernatant, add 50mL of absolute ethanol, evaporate in an oil bath at 90°C until dry, and obtain (FeF 3 ) 1.3 (FeF 3 0.33H 2 O) 1 Powder. After it is mixed with 15wt.% acetylene black, it is placed in an agate ball mill jar, ball milled at a speed of 300r / min for 3h, and dried at 80°C for 12h in a drying oven to obtain (FeF 3 ) 1.3 (FeF 3 0.33H 2 O) 1 / C Composite.

Embodiment 2

[0030] Weigh 4.0432g FeNO 3 9H 2 O, add 25mL of absolute ethanol, stir and dissolve, at room temperature and under constant stirring, slowly add 20wt% NH 4 Put the mixed solution of ethanol and water into a sealed polytetrafluoroethylene container, stir at room temperature for 1.0h, move it to a hydrothermal reaction kettle, and conduct a hydrothermal reaction at 110°C for 6h to obtain a pink precipitate. Pour off the supernatant and add 50mL of absolute ethanol was evaporated at 90°C in an oil bath until dry to obtain (FeF 3 ) 2.1 (FeF 3 0.33H 2 O) 1 Powder. After it is mixed with 20wt.% acetylene black, it is placed in an agate ball mill jar, ball milled at a speed of 320r / min for 2h, and dried at 100°C for 10h in a drying oven to obtain (FeF 3 ) 2.1 (FeF 3 0.33H 2 O) 1 / C Composite.

Embodiment 3

[0032] Weigh 2.7038g FeCl 3 ·6H 2 O, add 25mL of absolute ethanol, stir and dissolve, at room temperature and under constant stirring, slowly add 20wt% NH 4 HF 2 Put the mixed solution of ethanol and water into a sealed polytetrafluoroethylene container, stir at room temperature for 0.5h, move it to a hydrothermal reaction kettle, and conduct a hydrothermal reaction at 100°C for 8h to obtain a pink precipitate. Pour off the supernatant and add 50mL Absolute ethanol was evaporated at 90°C in an oil bath until dry to obtain (FeF 3 ) 1.1 (FeF 3 0.33H 2 O) 1 Powder. After it is mixed with 10wt.% acetylene black, it is placed in an agate ball mill jar, ball milled at a speed of 280r / min for 4h, and dried at 90°C for 12h in a drying oven to obtain (FeF 3 ) 1.1 (FeF 3 0.33H 2 O) 1 / C Composite.

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Abstract

The invention discloses a mixed crystal form ferric fluoride cathode material and a preparation method thereof. The chemical formula of the mixed crystal form ferric fluoride cathode material is (FeF3)x(FeF3.0.33H2O)y / C. The cathode material has the beneficial effects as follows: the product particle size can be optimized through controlling the reaction temperature and time, the obtained product purity is high, and a ferric fluoride preparation method is novel, simple and high in yield. The prepared ferric fluoride is in a mixed crystal form of a cubic system and an orthorhombic system, the ferric fluoride of the orthorhombic system is contributed to maintaining the stability of an FeF3 structure in processes of insertion / deinsertion of lithium ion, so that the cycling performance of the material is improved, and the ferric fluoride of the cubic system is contributed to improving the mass specific capability and thermal stability of the material. The (FeF3)x(FeF3.0.33H2O)y / C material prepared by the method has the advantages of small particle size, uniform distribution, good repeatability and excellent electrochemical performance.

Description

technical field [0001] The invention relates to a ferric fluoride cathode material with mixed crystal forms and a preparation method thereof. The material can be used as an anode material for a lithium secondary battery and belongs to the technical field of preparation of chemical power supply materials. Background technique [0002] The demand for energy in today's society has greatly promoted the development of energy storage technology. Since the industrialization of lithium-ion batteries by Sony in 1990, lithium-ion batteries, as the most successful energy storage device, have occupied the market of portable appliances. Lithium-ion battery is a new type of energy storage device that has developed rapidly since 1990. It has the advantages of high energy density, high open circuit voltage, long cycle life, no memory effect, and no environmental pollution. It is used in portable electronic devices such as mobile phones, notebook computers, and digital cameras. The product ...

Claims

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Application Information

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IPC IPC(8): H01M4/58H01M4/62
CPCY02E60/10
Inventor 刘黎周萌王先友郭海鹏谭金黎颜子超舒洪波杨秀康邹贵山
Owner XIANGTAN UNIV
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