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Nano composite material with yolk double-shell structure as well as preparation method and application of nano composite material

A technology of nanocomposite material and shell structure, which is applied in the field of nanocomposite material with egg yolk double shell structure and its preparation, which can solve the problems of poor cycle stability, complicated preparation method and simple internal structure, and achieve high porosity and simple synthesis process , the effect of convenient operation

Pending Publication Date: 2022-06-28
QILU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the inventors have found that the currently prepared negative electrode materials for lithium-ion batteries still have the problems of complex preparation methods, simple internal structures, low capacity and poor cycle stability.

Method used

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  • Nano composite material with yolk double-shell structure as well as preparation method and application of nano composite material
  • Nano composite material with yolk double-shell structure as well as preparation method and application of nano composite material
  • Nano composite material with yolk double-shell structure as well as preparation method and application of nano composite material

Examples

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Embodiment approach

[0041] Another embodiment of the present invention provides a method for preparing a nanocomposite material with a double-shell structure of egg yolk, comprising the following steps:

[0042] Dissolving divalent nickel salt and ferric salt in a mixed solvent of glycerol and isopropanol to carry out solvothermal reaction to obtain nickel iron glycerate nanospheres;

[0043] Nickel iron glycerate nanospheres and metavanadate (VO 3 – ) to carry out anion exchange reaction to obtain amorphous Ni–Fe–V precursor with egg yolk shell structure;

[0044] The Ni–Fe–V precursor was calcined in air to obtain crystalline NiFe 2 V 2 O 8 ;

[0045] the NiFe 2 V 2 O 8 Mixing with dopamine and performing dopamine polymerization to obtain polydopamine-coated NiFe 2 V 2 O 8 Precursor;

[0046] Polydopamine-coated NiFe under inert atmosphere 2 V 2 O 8 The precursor is obtained by calcining.

[0047] The invention adopts the nano-composite material of egg yolk double shell structur...

Embodiment 1

[0084] A method for preparing a Ni-Fe-V precursor with an egg yolk shell structure, comprising the following steps:

[0085] Under magnetic stirring, 0.2 mmol Ni(NO 3 ) 2 ·6H 2 O and 0.4mmol Fe(NO 3 ) 3 ·9H 2 O was added to 60 mL of a mixed solution of isopropanol and glycerol (isopropanol:glycerol=5:1), stirred and dissolved until a transparent orange-yellow solution was formed, and transferred to a reaction kettle with a polytetrafluoroethylene lining (capacity 100 mL). and heated at 165 °C for 7 h. After cooling to room temperature naturally, the precipitate was collected by centrifugation, washed several times with deionized water and absolute ethanol in turn, and then dried in a blast drying oven at 60 °C for 6 h to obtain pale yellow nickel-iron glycerate spheres. 10 mg of nickel iron glycerate spheres were dispersed in 30 mL of absolute ethanol and sonicated for 60 min. Then the above dispersion was heated to 90°C under the condition of condensation and reflux, a...

Embodiment 2

[0088] The Ni–Fe–V precursor powder prepared in Example 1 was placed in a tube furnace and calcined in air at 500 °C for 2 h to obtain brick-red NiFe. 2 V 2 O 8 . 80mg NiFe 2 V 2 O 8 The powder was dispersed in 100 mL of Tris buffer solution (pH=8.5), and was sonicated for 1 h to make the dispersion uniform. Subsequently, 30 mg of dopamine hydrochloride was added to the above dispersion and stirring was continued for 8 h. The precipitate was collected by centrifugation, washed several times with deionized water, and then dried in a blast drying oven at 60 °C for 10 h. 2 V 2 O 8 @PDA was placed in a tube furnace and calcined at 400 °C for 2 h in an argon atmosphere to obtain NiFe with egg yolk double shell structure 2 V 2 O 8 @NC.

[0089] The scanning electron microscope (SEM) and transmission electron microscope (TEM) images of the ternary transition metal oxide / nitrogen-doped carbon nanocomposite with egg yolk double shell structure prepared in this example are s...

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Abstract

The invention belongs to the field of new energy materials, and relates to a nano composite material with a yolk double-shell structure as well as a preparation method and application of the nano composite material. The nanometer composite material of the yolk double-shell structure is formed by compounding nitrogen-doped carbon and NiFe2V2O8, the nanometer composite material is of a porous yolk double-shell nanosphere structure, the yolk double-shell structure sequentially comprises an outer shell, an inner shell and an inner core from outside to inside, and gaps are reserved between the outer shell and the inner shell and between the inner shell and the inner core. The invention provides a ternary transition metal oxide negative electrode material with excellent electrochemical performance for a lithium ion battery, and the prepared nano composite material with the yolk double-shell structure has the advantages of various components and unique yolk double-shell structure, and shows excellent cycling stability and rate capability.

Description

technical field [0001] The invention belongs to the field of new energy materials, and relates to a nano-composite material with an egg yolk double-shell structure and a preparation method and application thereof. Background technique [0002] The disclosure of information in this Background section is only for enhancement of understanding of the general background of the invention and should not necessarily be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person of ordinary skill in the art. [0003] Transition metal oxides have excellent properties such as abundant valence electron configurations, simple preparation methods, strong electrochemical reversibility, and high specific capacitance, and are widely used in electrode materials. However, traditional single transition metal oxides have disadvantages such as low electrical conductivity, poor cycling stability, and low specific surface area, which lim...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/48H01M4/52H01M4/587H01M4/62H01M10/0525C01G53/00C01B32/15B82Y30/00
CPCH01M4/366H01M4/523H01M4/483H01M4/587H01M4/624H01M4/628H01M10/0525C01G53/006C01B32/15B82Y30/00H01M2004/027C01P2004/32C01P2004/62C01P2004/64C01P2004/80C01P2006/40
Inventor 周国伟杨辰雨王晓任永强岳堃
Owner QILU UNIV OF TECH
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