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
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[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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