A kind of bimetallic fluoride and its preparation method and application in lithium-free positive electrode

A technology of fluoride and bimetal, which is applied in the field of metal fluoride preparation, can solve the problems of cumbersome reaction steps, etc., and achieve the effect of overcoming low capacity utilization, high efficiency utilization, and uniform electron flow effect

Active Publication Date: 2022-06-21
HUAZHONG UNIV OF SCI & TECH
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  • 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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  • A kind of bimetallic fluoride and its preparation method and application in lithium-free positive electrode
  • A kind of bimetallic fluoride and its preparation method and application in lithium-free positive electrode
  • A kind of bimetallic fluoride and its preparation method and application in lithium-free positive electrode

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preparation example Construction

[0039] The invention provides a preparation method of a bimetallic fluoride, which adopts a fluorination process of a precursor reaction product, comprising the following steps:

[0040] S1, the transition metal-based organometallic framework material and the transition metal nitrate are placed in a hydrothermal still in a molar ratio of (1~4):1, and the hydrothermal solvent is water, and the first hydrothermal synthesis reaction is carried out;

[0041] S2, after the first hydrothermal synthesis reaction finishes, cooling and taking out the reaction product, after centrifugal drying, dissolving the reaction product in an 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 and the transition metal species in the transition metal nitrate are different.

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

Embodiment 1

[0058] Embodiment 1 provides a kind of preparation method of cobalt-nickel bimetallic fluoride, adopts the fluorination process of precursor reaction product, 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 at a molar ratio of 4:1, placed in a 200mL hydrothermal kettle, the hydrothermal solvent is water, the hydrothermal temperature is 180 ° C, and the time is 4h, and the first hydrothermal synthetic reaction;

[0060] S2, after the first hydrothermal synthesis reaction finishes, cooling and taking out the reaction product, after centrifugal drying, the reaction product is dissolved in an aqueous hydrofluoric acid solution (in the aqueous hydrofluoric acid solution, the volume ratio of hydrofluoric acid and water is 1 : 8), stir and heat treatment, the stirring and heating temperature is 160° C., and the stirring and heating time is 4 h, to prep...

Embodiment 2

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

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

[0064] S2, after the first hydrothermal synthesis reaction finishes, cooling and taking out the reaction product, after centrifugal drying, the reaction product is dissolved in an aqueous hydrofluoric acid solution (in the aqueous hydrofluoric acid solution, the volume ratio of hydrofluoric acid and water is 1 : 8), stir and heat treatment, the stirring and heating temperature is 160° C., and the stirring and heating time is 4 h, to prepare a ...

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Abstract

The invention provides a double metal fluoride, a preparation method thereof and an application in a lithium-free positive electrode. The preparation method is as follows: selecting a transition metal-based organic metal framework material as a metal framework precursor, selecting a commonly used 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 , thus obtaining a multimetallic cation framework, and then further fluorinating it to prepare the obtained double metal fluoride. The bimetallic fluoride has a uniform pore structure and a high ion / electronic mixed conductive scaffold structure, so that the capacity of the metal fluoride can be efficiently utilized, effectively overcoming the capacity utilization of the traditional metal fluoride cathode in the prior art The technical defects of low voltage, large voltage hysteresis, and poor cycle stability.

Description

technical field [0001] The invention relates to the technical field of metal fluoride preparation, in particular to a bimetallic fluoride and a preparation method thereof and application in a lithium-free positive electrode. Background technique [0002] Currently, Li-ion batteries have been widely developed and commercialized due to their high specific capacity, energy density, and cyclability. Despite the undeniable success of lithium-ion batteries, recent technological challenges, such as the development of energy storage devices for hybrid and fully electric vehicles, have focused attention on making lithium-ion batteries with longer lifespans and higher reliability on the battery. Due to the potential advantages of low cost, environmental friendliness, facile synthesis, insensitivity to moisture, and high energy density, Li-free cathodes may become competitive candidates compared to Li-containing cathodes. [0003] Theoretically, metal fluoride (MF) conversion cathode...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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