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Bimetal fluoride, preparation method thereof and application of bimetal fluoride in lithium-free positive electrode

A fluoride and bimetal technology, applied in the field of metal fluoride preparation, can solve the problems of cumbersome reaction steps and the like

Active Publication Date: 2021-09-14
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this preparation method has the disadvantage of cumbersome reaction steps

Method used

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  • Bimetal fluoride, preparation method thereof and application of bimetal fluoride in lithium-free positive electrode
  • Bimetal fluoride, preparation method thereof and application of bimetal fluoride in lithium-free positive electrode
  • Bimetal fluoride, preparation method thereof and application of bimetal fluoride in lithium-free positive electrode

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preparation example Construction

[0039] The invention provides a method for preparing a double metal fluoride, which adopts a precursor reaction product fluorination process, comprising the following steps:

[0040] S1, placing the transition metal-based organometallic framework material and the transition metal nitrate in a molar ratio of (1-4):1 in a hydrothermal kettle, the hydrothermal solvent being water, and performing the first hydrothermal synthesis reaction;

[0041] S2, after the first hydrothermal synthesis reaction, cooling and taking out the reaction product, after centrifugal drying, dissolving the reaction product in aqueous hydrofluoric acid solution, stirring and heating to prepare a bimetallic fluoride;

[0042] The transition metal species in the transition metal-based organometallic framework material is different from the transition metal species in the transition metal nitrate.

[0043] Further, in the first hydrothermal synthesis reaction described in step S1, the hydrothermal temperatu...

Embodiment 1

[0058] Embodiment 1 provides a kind of preparation method of cobalt-nickel double metal fluoride, adopts precursor reaction product fluorination process, comprises the following steps:

[0059] S1, the transition metal-based organometallic framework material ZIF-67 (such as figure 1 Shown) and transition metal nitrate-nickel nitrate are placed in a 200mL hydrothermal kettle at a molar ratio of 4:1, the hydrothermal solvent is water, the hydrothermal temperature is 180°C, and the time is 4h, the first hydrothermal synthesis reaction;

[0060] S2, after the first hydrothermal synthesis reaction is finished, cool down and take out the reaction product, after centrifugal drying, dissolve the reaction product in an aqueous solution of hydrofluoric acid (in the aqueous solution of hydrofluoric acid, the volume ratio of hydrofluoric acid to water is 1 : 8), heat treatment with stirring, the temperature of stirring and heating is 160° C., and the time of stirring and heating is 4 hou...

Embodiment 2

[0062] Embodiment 2 provides a kind of preparation method of cobalt-nickel double metal fluoride, adopts precursor reaction product fluorination process, comprises the following steps:

[0063] S1, put transition metal-based organometallic framework material ZIF-67 and transition metal nitrate-nickel nitrate in a molar ratio of 1:1 in a 200mL hydrothermal kettle, the hydrothermal solvent is water, and the hydrothermal temperature is 180°C , the time is 4h, carry out the first hydrothermal synthesis reaction;

[0064] S2, after the first hydrothermal synthesis reaction is finished, cool down and take out the reaction product, after centrifugal drying, dissolve the reaction product in an aqueous solution of hydrofluoric acid (in the aqueous solution of hydrofluoric acid, the volume ratio of hydrofluoric acid to water is 1 : 8), stirring and heating treatment, the stirring and heating temperature is 160 ° C, the stirring and heating time is 4h, and the cobalt-nickel bimetallic fl...

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Abstract

The invention provides a bimetallic fluoride, a preparation method thereof and an application of the bimetallic fluoride in a lithium-free positive electrode. The preparation method comprises the following steps: selecting a transition metal-based organic metal framework material as a metal framework precursor, selecting common transition metal nitrate as a doping element source, and doping the transition metal-based organic metal framework material with other types of transition metal elements to obtain a multi-metal cation framework; and further carrying out fluoridation treatment on the bimetallic fluoride to prepare the bimetallic fluoride. The bimetallic fluoride has a uniform pore structure and a high ion / electron mixed conductive support structure, so that the capacity of the metal fluoride can be efficiently utilized, and the technical defects of low capacity utilization rate, large voltage lag and poor cycling stability of a traditional metal fluoride cathode in the prior art are effectively overcome.

Description

technical field [0001] The invention relates to the technical field of metal fluoride preparation, in particular to a double metal fluoride, a preparation method thereof and an application in a lithium-free positive electrode. Background technique [0002] Currently, Li-ion batteries have been extensively developed and commercialized due to their high specific capacity, energy density, and recyclability. Despite the undeniable success of lithium-ion batteries, recent technological challenges, such as the development of energy storage devices for hybrid and all-electric vehicles, have focused attention on making longer-lived and more reliable lithium-ion batteries on the battery. Due to the potential advantages of low cost, environmental benignity, facile synthesis, moisture insensitivity, and high energy density, Li-free cathodes may become competitive candidate materials compared with Li-containing cathodes. [0003] Theoretically, metal fluoride (MF) switching cathodes h...

Claims

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Application Information

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IPC IPC(8): H01M4/58H01M10/052
CPCH01M4/582H01M10/052H01M2004/028Y02E60/10
Inventor 曹元成郭亚晴韩奇高王富禾
Owner HUAZHONG UNIV OF SCI & TECH
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