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Cobalt fluoride-based composite electrode material and preparation method thereof

A composite electrode, cobalt fluoride-based technology, applied in the direction of positive electrode, battery electrode, active material electrode, etc., can solve the problems of irreversibility of fluoride, difference between experimental voltage and theoretical thermodynamic voltage of transition metal difluoride, etc.

Pending 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

[0003] Although conversion materials have made some progress as important materials for future batteries, there are still some unresolved issues: (1) the difference between the experimental and theoretical thermodynamic voltages of transition metal difluorides; irreversible conversion reaction

Method used

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  • Cobalt fluoride-based composite electrode material and preparation method thereof
  • Cobalt fluoride-based composite electrode material and preparation method thereof
  • Cobalt fluoride-based composite electrode material and preparation method thereof

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preparation example Construction

[0036] A method for preparing a cobalt fluoride-based composite electrode material provided by the invention comprises the following steps:

[0037] S1. Cobalt-based metal-organic frameworks are used as precursors to combine with fluorine-containing materials to obtain CoF 2 ;

[0038] S2. Combining graphene oxide with CoF 2 Fully ground according to the preset ratio and placed in a tube furnace, the gas atmosphere is air, the temperature is raised to 300-500°C at a heating rate of 5-10°C / min, and the temperature is kept for the preset time; then the powder is taken out after cooling, and then fully ground , to obtain the composite electrode material rGO@CoF 2 .

[0039] By adopting the above technical scheme, on the one hand, the CoF synthesized based on ZIF 2 It can maintain the porous structure and high stability of ZIF, and has good electrical conductivity; on the other hand, combining rGO with CoF 2 After calcination and compounding, the composite product obtained no...

Embodiment 1

[0050] A cobalt fluoride-based composite electrode material prepared by the following steps:

[0051] S1. Cobalt-based metal-organic frameworks are used as precursors to combine with fluorine-containing materials to obtain CoF 2 .

[0052] Among them, the preparation method of cobalt-based metal organic framework please refer to figure 1 shown, including: Co(NO 3 ) 2 Dissolve it with 2-methylimidazole in N,N-dimethylformamide, and react with stirring at room temperature for 24 hours to obtain ZIF-67.

[0053] The composite method of cobalt-based metal-organic framework and fluorine-containing materials includes: first heating ZIF-67 and ammonium fluoride with a molar ratio of 1:2 in air atmosphere and at a temperature of 100-150°C for 1 hour; then placing them in a tube furnace , in an inert gas atmosphere, heat up to 400°C at a heating rate of 5-10°C / min, and keep warm for 4 hours; take it out after cooling down, centrifuge the powder three times with alcohol solvent, and...

Embodiment 2

[0060] A cobalt fluoride-based composite electrode material. Compared with Example 1, the difference is that the composite method of a cobalt-based metal organic framework and a fluorine-containing material includes: mixing 1g of ZIF-67 with 10ml of hydrofluoric acid at 120°C Under hydrothermal reaction for 4h, CoF was obtained 2 . Others are substantially the same as in Embodiment 1, and will not be repeated here.

[0061] see Figure 7 As shown, it can be seen that the CoF 2 It also has a porous structure, which is derived from the original morphology of the ZIF precursor.

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Abstract

The invention provides a cobalt fluoride-based composite electrode material and a preparation method thereof. The method comprises the following steps: S1, compounding a cobalt-based metal organic framework with a fluorine-containing material to obtain CoF2; and S2, fully grinding graphene oxide and CoF2 according to a preset proportion, putting the ground graphene oxide and CoF2 into a tubular furnace, heating to 300-500 DEG C at a heating rate of 5-10 DEG C / min in a gas atmosphere of air, and keeping the temperature for a preset time; and cooling, taking out the obtained powder, and fully grinding to obtain the rGO@CoF2. According to the preparation method, the rGO and the CoF2 are compounded, so that the obtained composite product has the electrochemical performance of fluoride and also keeps the layered morphology and good conductivity of the reduced graphene oxide rGO; meanwhile, CoF2 synthesized based on ZIF can maintain the porous structure and high stability of ZIF, and a new thought is provided for preparation of a high-performance battery material through proper selection of a precursor and a compounding mode of a conductive material.

Description

technical field [0001] The invention relates to the technical field of electrode material preparation, in particular to a cobalt fluoride-based composite electrode material and a preparation method thereof. Background technique [0002] Ion batteries have been used as energy sources for various mobile and stationary applications. In order to meet the ever-increasing market demand, it is crucial to substantially increase the energy density and reduce the cost of rechargeable batteries. Compared with commercial intercalation electrode compounds, the conversion material has a higher lithium storage capacity. Among conversion materials, transition metal difluorides MF 2 (MFe,Ni,Cu), especially exhibit high reaction voltage due to the strong M–F ionic bond. Badway et al. (Badway, F., Pereira, N., Cosandey, F., & Amatucci, G.G. (2003). Carbon-Metal Fluoride Nanocomposites. Journal of The Electrochemical Society, 150(9), A1209. doi:10.1149 / 1.1596162) developed a FeF 3 Carbon-m...

Claims

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Application Information

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IPC IPC(8): H01M4/58H01M4/62H01M10/052
CPCH01M4/582H01M4/625H01M10/052H01M2004/028Y02E60/10
Inventor 曹元成郭亚晴韩奇高王富禾
Owner HUAZHONG UNIV OF SCI & TECH
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