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KFeF3 nanometer material with hollow structure and preparation method and application of KFeF3 nanometer material

A nano-material and hollow technology, applied in the field of nano-materials, can solve problems that have not been reported, and achieve the effect of low price, mild conditions, and easy access to raw materials

Active Publication Date: 2018-10-02
THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

KF 3 Due to the richness of K ions, it has the potential as an anode material for potassium ion batteries, and has a specific size of hollow KFeF 3 Nanomaterials can better store and release potassium ions in the charge-discharge cycle of potassium-ion batteries, greatly improving their cycle performance and rate performance; however, so far, the KFeF with a hollow structure 3 The preparation method of nanomaterials has not been reported yet

Method used

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  • KFeF3 nanometer material with hollow structure and preparation method and application of KFeF3 nanometer material

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Embodiment 1

[0038] The embodiment of the present invention provides a KFeF hollow structure 3 The preparation method of nanometer material, concrete steps are as follows:

[0039] (1) Measure 1.5ml of n-butanol, 7.5ml of octane, 0.75ml of deionized water and 0.1mol of CTAB in two times, and mix to obtain two mixed emulsions;

[0040] (2) Weigh 0.1g FeCl 2 4H 2 O and 0.19g KF 2H 2 O powder, respectively added in two parts of mixed emulsions prepared in step (1), stirred evenly by ultrasonic to obtain FeCl 2 4H 2 O Microemulsion and KF·2H 2 O microemulsion;

[0041] (3) KF·2H 2 O microemulsion was added dropwise to FeCl at a rate of 0.1 mL / min. 2 4H 2 In the O microemulsion, after reacting for 30 minutes, add 30ml of a mixed solution of chloroform and methanol with a volume ratio of 1:1 to terminate the reaction, separate the tan precipitate, and wash it with methanol and deionized aqueous solution with a volume ratio of 5:1 , that is, the final product KFeF with a hollow structur...

Embodiment 2

[0045] The embodiment of the present invention provides a KFeF hollow structure 3 The preparation method of nanometer material, concrete steps are as follows:

[0046] (1) Measure 1.5ml of n-butanol, 7.5ml of octane, 0.75ml of deionized water and 0.1mol of CTAB in two times, and mix to obtain two mixed emulsions;

[0047] (2) Weigh 0.2g FeCl 2 4H 2 O and 0.19g KF 2H 2 O powder, respectively added in two parts of mixed emulsions prepared in step (1), stirred evenly by ultrasonic to obtain FeCl 2 4H 2 O Microemulsion and KF·2H 2 O microemulsion;

[0048] (3) KF·2H 2 O microemulsion was added dropwise to FeCl at a rate of 0.1 mL / min. 2 4H 2 In the O microemulsion, after reacting for 30 minutes, add 30ml of a mixed solution of chloroform and methanol with a volume ratio of 1:1 to terminate the reaction, separate the tan precipitate, and wash it with methanol and deionized aqueous solution with a volume ratio of 5:1 , that is, the final product KFeF with a hollow structur...

Embodiment 3

[0052] The embodiment of the present invention provides a KFeF hollow structure 3 The preparation method of nanometer material, concrete steps are as follows:

[0053] (1) Measure 1.5ml of n-butanol, 7.5ml of octane, 0.75ml of deionized water and 0.1mol of CTAB in two times, and mix to obtain two mixed emulsions;

[0054] (2) Weigh 0.2g FeCl 2 4H 2 O and 0.19g KF 2H 2 O powder, respectively added in two parts of mixed emulsions prepared in step (1), stirred evenly by ultrasonic to obtain FeCl 2 4H 2 O Microemulsion and KF·2H 2 O microemulsion;

[0055] (3) KF·2H 2 O microemulsion was added dropwise to FeCl at a rate of 0.1 mL / min. 2 4H 2 In the O microemulsion, after reacting for 30 minutes, add 30ml of a mixed solution of chloroform and methanol with a volume ratio of 1:1 to terminate the reaction, separate the tan precipitate, and wash it with methanol and deionized aqueous solution with a volume ratio of 5:1 , that is, the final product KFeF with a hollow structur...

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Abstract

The invention discloses a KFeF3 nanometer material with a hollow structure and a preparation method and application of the KFeF3 nanometer material. The preparation method comprises the steps of dropwise adding a KF.2H2O microemulsion into a FeCl2.4H2O microemulsion, reacting for 0.5-60min, adding a reaction terminator to terminate reaction, separating precipitate and then cleaning to obtain the KFeF3 nanometer material, wherein the KFeF3 nanometer material is of a hollow structure with the particle sizes of 10-50nm; the volume ratio of the internal hollow structure is 25-80%; and the application prospect in a negative electrode material for a potassium-ion button battery is broad. According to the preparation method, controllable synthesis of the KFeF3 nanometer materials, which are different in size and different in hollow size, with the hollow structure is achieved only through dropwise adding the KF.2H2O microemulsion into the FeCl2.4H2O microemulsion and cooperatively controllingthe concentration and the adding rates of the KF.2H2O microemulsion and the FeCl2.4H2O microemulsion, and the KFeF3 nanometer material is mild in preparation condition, simple and controllable in process, high in efficiency, suitable for large-scale production and wide in application.

Description

technical field [0001] The invention relates to the technical field of nanomaterials, in particular to a KFeF with a hollow structure 3 Nanomaterials and their preparation methods and applications. Background technique [0002] With the rapid development of social economy, energy crisis and environmental pollution have become two major social problems that people face, and various new energy sources have attracted extensive attention of researchers. Due to its high voltage and energy density, secondary batteries have become the subject of extensive research by researchers, among which lithium-ion batteries are currently the most widely studied secondary batteries that have been commercially applied. However, due to the small reserves in the earth's crust, lithium resources cannot meet the widespread use of lithium-ion batteries worldwide in the future; researchers have gradually shifted their research interest to batteries with abundant alkali metals. [0003] Potassium-io...

Claims

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Application Information

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IPC IPC(8): H01M4/58H01M10/0525H01M4/525H01M4/38
CPCH01M4/381H01M4/525H01M4/582H01M10/0525Y02E60/10
Inventor 锁国权王伟于琪瑶刘志伟贺蒙
Owner THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA
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