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Method for preparing carbon fluoride/fluorinated metal composite material

A composite material and metal fluoride technology, which is applied in negative electrodes, battery electrodes, active material electrodes, etc., can solve the problems of unsatisfactory battery performance and poor composite effect, and achieve rich inner pores, low cost, and high specific surface area. Effect

Active Publication Date: 2019-08-09
CIVIL AVIATION UNIV OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Liu Wen et al first reported the use of fluorinated carbon nanotubes and FeF 3 The technology of preparing composite cathode materials by grinding [Carbon, 2015, 93, 523-532], but this technology uses a physical mixing method, fluorinated carbon nanotubes and FeF 3 On the microscopic level, the recombination effect is poor, and the battery performance is not ideal

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] The preparation method of the carbon fluoride / metal fluoride composite material provided in this embodiment includes the following steps in order:

[0016] (1) Carry out high-temperature carbonization of 1.0g Cu-BTC in a nitrogen atmosphere, the heating rate is 2°C / min, the carbonization temperature is 700°C, and then cooled to room temperature to obtain a composite material precursor;

[0017] (2) The composite material precursor prepared above is placed in a reaction kettle, dried at a temperature of 150° C., and then passed into a mixed gas composed of 25% fluorine and 75% nitrogen by volume fraction, and the temperature is raised to 400° C., fluorination reaction for 3 hours, and vacuum drying to obtain a carbon fluoride / metal fluoride composite material as the final product. The specific surface area of ​​the product measured by the BET method is 537m 2 / g, the discharge specific capacity is 735mAh / g under the condition of 0.05C rate measured by electrochemical te...

Embodiment 2

[0019] The preparation method of the carbon fluoride / metal fluoride composite material provided in this embodiment includes the following steps in order:

[0020] (1) 1.0g MIL-101(Fe) was subjected to high-temperature carbonization in a nitrogen atmosphere, the heating rate was 2°C / min, the carbonization temperature was 700°C, and then cooled to room temperature to obtain a composite material precursor;

[0021] (2) The composite material precursor prepared above is placed in a reaction kettle, dried at a temperature of 150° C., and then passed into a mixed gas composed of 15% fluorine and 85% nitrogen by volume fraction, and the temperature is raised to 450° C., fluorination reaction for 2 hours, and vacuum drying to obtain a carbon fluoride / metal fluoride composite material as the final product. The specific surface area of ​​the product measured by the BET method is 383m 2 / g, the discharge specific capacity is 791mAh / g under the condition of 0.05C rate measured by electro...

Embodiment 3

[0023] The preparation method of the carbon fluoride / metal fluoride composite material provided in this embodiment includes the following steps in order:

[0024] (1) 1.0g ZIF-67(Co) was subjected to high-temperature carbonization in a nitrogen atmosphere, the heating rate was 2°C / min, and the carbonization temperature was 750°C, and then cooled to room temperature to obtain a composite material precursor;

[0025] (2) The composite material precursor prepared above is placed in a reaction kettle, dried at a temperature of 150° C., and then passed into a mixed gas composed of 15% fluorine and 85% nitrogen by volume fraction, and the temperature is raised to 400° C., fluorination reaction for 2 hours, and vacuum drying to obtain a carbon fluoride / metal fluoride composite material as the final product. The specific surface area of ​​the product measured by the BET method is 419m 2 / g, the discharge specific capacity is 799mAh / g under the condition of 0.05C rate measured by elec...

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Abstract

A method for preparing a carbon fluoride / fluorinated metal composite material comprises the steps of: carbonizing at least one of the group consisting of copper-based, iron-based, cobalt-based, nickel-based, and manganese-based metal organic framework materials at a high temperature in an inert gas atmosphere, then cooling the organic framework material to room temperature to obtain a composite material precursor; drying the composite material precursor in a reaction vessel, then introducing a mixed gas composed of a fluorine gas and a nitrogen gas, performing a fluorination under a heating condition, and performing vacuum drying to obtain the carbon fluoride / fluorinated metal composite material as a final product. The method is low in raw material cost, easy to operate and liable to industrial production. The fluorinated metal and carbon fluoride composite materials are prepared by an in-situ method. The two materials have high recombination degree, and the composite material has richinner pores and high specific surface area. The fluorinated metal and carbon fluoride composite materials have good chemical stability, high discharge specific capacity and high discharge voltage platform, and can be applied to lithium ion batteries and the like, and have very good application prospects.

Description

technical field [0001] The invention belongs to the technical field of material synthesis, in particular to a method for preparing a carbon fluoride / metal fluoride composite cathode material. Background technique [0002] Metal fluoride (such as: CuF 2 , FeF 3 , CoF 2 , NiF 2 , MnF 2 etc.) and fluorinated carbons have high theoretical energy density and can be used as positive electrode materials for batteries, but they have their own advantages and disadvantages in practical applications, for example: metal fluoride discharge voltage platform is higher (such as: CuF 2 : 3.55V vs Li / Li + , FeF 3 : 2.74V vs Li / Li + , CoF 2 : 2.85V vs Li / Li + , NiF 2 : 2.96V vs Li / Li + , MnF 2 : 2.65V vs Li / Li + ), but its conductivity is poor, the effective utilization rate is low, and the capacity cannot be exerted; the specific capacity of fluorinated carbon is high (865mAh / g), but its discharge voltage platform is low (about 2.5V vs Li / Li + ), so that the overall energy densi...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/583
CPCH01M4/362H01M4/5835H01M2004/027Y02E60/10
Inventor 李秀涛周晓猛张海军
Owner CIVIL AVIATION UNIV OF CHINA
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