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Method for one-step synthesis of iron fluoride/C positive electrode material

A technology of ferrous fluoride and cathode material, applied in battery electrodes, electrochemical generators, electrical components, etc., can solve the problems of complex process, environmental pollution, and many influencing factors, and achieve simple process, short holding time, avoidance of growing effect

Inactive Publication Date: 2016-12-07
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Currently on FeF 2 The preparation of the precursor is mainly prepared by the traditional co-precipitation method, and then sintered under argon. This process is complicated, and there are many influencing factors in the preparation process, and it will pollute the environment. -1 Left and right; the present invention is aimed at present technical problem, has proposed a kind of technology simple, cost is low, the particle size of product nano-ferrous fluoride / C is little, uniform, and carbon tightly coats the technological method of ferrous fluoride

Method used

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  • Method for one-step synthesis of iron fluoride/C positive electrode material
  • Method for one-step synthesis of iron fluoride/C positive electrode material
  • Method for one-step synthesis of iron fluoride/C positive electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The method for synthesizing nano-ferrous fluoride / C by one-step method described in this embodiment specifically comprises the following steps:

[0019] (1) Mix ferrous oxalate and powdered polytetrafluoroethylene evenly according to the mass ratio of ferrous oxalate and polytetrafluoroethylene at a ratio of 8:3, and then place it in an argon atmosphere at a heating rate of 8°C / min Rapidly raise the temperature to 650°C, keep the temperature for 2 hours, and cool down to room temperature with the furnace after the roasting is completed;

[0020] (2) Take out the product and grind and disperse to obtain nanometer ferrous fluoride / C positive electrode material powder.

[0021] Electrochemical performance test:

[0022] 1. the nano-ferrous fluoride / C powder obtained in step (2), and acetylene black, polyvinylidene fluoride (PVDF) are taken by weighing and placed in an agate mortar in a ratio of 8:1:1 by mass ratio, Add an appropriate amount of N-methyl-2-pyrrolidone (NMP...

Embodiment 2

[0026] The method for synthesizing nano-ferrous fluoride / C by one-step method described in this embodiment specifically comprises the following steps:

[0027] (1) Mix ferrous oxalate and powdered polytetrafluoroethylene evenly according to the mass ratio of ferrous oxalate and polytetrafluoroethylene at a ratio of 7:3, and then place it in an argon atmosphere at a heating rate of 9°C / min Rapidly raise the temperature to 550°C, keep the temperature for 1 hour, and cool down to room temperature with the furnace after the roasting is completed;

[0028] (2) Take out the product and grind and disperse to obtain nanometer ferrous fluoride / C positive electrode material powder.

[0029] Electrochemical performance test: assemble the nano-ferrous fluoride / C powder obtained in step (2) into a CR2025 button battery according to the method described in Example 1; test its charge and discharge performance after standing for 24 hours.

[0030] The XRD picture of the nanometer ferrous flu...

Embodiment 3

[0034] The method for synthesizing nano-ferrous fluoride / C by one-step method described in this embodiment specifically comprises the following steps:

[0035] (1) Mix ferrous oxalate and powdered polytetrafluoroethylene evenly according to the mass ratio of ferrous oxalate and polytetrafluoroethylene at a ratio of 10:3, and then place it in an argon atmosphere at a heating rate of 7°C / min Rapidly raise the temperature to 500°C, keep the temperature for 1.5h, and cool down to room temperature with the furnace after the roasting is completed;

[0036] (2) Take out the product and grind and disperse to obtain nanometer ferrous fluoride / C positive electrode material powder.

[0037] Electrochemical performance test: assemble the nano-ferrous fluoride / C powder obtained in step (2) into a CR2025 button battery according to the method described in Example 1; test its charge and discharge performance after standing for 24 hours.

[0038] The maximum discharge specific capacity of th...

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Abstract

The invention discloses a method for one-step synthesis of iron fluoride / C, and belongs to the technical field of lithium ion batteries. The method disclosed by the invention comprises the following steps of fully mixing and grinding ferrous oxalate and excessivepowdered polytetrafluoroethylene, loading a uniform mixture in an aluminum oxide crucible, and roasting the uniform mixture in an argon environment, wherein the roasting temperature is 500-650 DEG C, and the temperature is maintained for 1-3 hours; cooling the uniform mixture with a furnace to a room temperature after roasting to obtain a roasted product, namely iron fluoride / C; and taking out the product, and grinding the product to obtain fine nanometer iron fluoride / C powder. The nanometer iron fluoride / C prepared according to the method has the advantages that the particle size is small and uniform, and iron fluoride is closely wrapped by carbon; and the heat preservation time in the roasting process is relatively short, and uniform and fine particles are ensured and are prevented from growing up.

Description

technical field [0001] The invention relates to a method for synthesizing nanometer ferrous fluoride / C cathode material in one step, and the nanometer ferrous fluoride / C cathode material prepared by the method, which belongs to the technical field of lithium ion batteries. Background technique [0002] Energy is the lifeblood of the development of today's society. The depletion of fossil fuels and serious environmental pollution make the storage and application of new energy an important research hotspot. As an important energy storage system, lithium-ion batteries have attracted much attention in the field of new energy technology due to their excellent characteristics such as high reversible capacity, high voltage, high cycle performance and high energy density. Known as the leading chemical power source in the 21st century, its application fields continue to expand. However, the competition in the lithium-ion battery industry is very fierce. Finding new electrode materia...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/583H01M4/62H01M10/0525
CPCH01M4/366H01M4/582H01M4/583H01M4/625H01M10/0525Y02E60/10
Inventor 张正富汤梦云王梓刘警峰
Owner KUNMING UNIV OF SCI & TECH
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