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MOF-derived porous carbon box loaded Co<3>V<2>O<8> composite negative electrode material and preparation method and application thereof

A technology of negative electrode material and composite material, which is applied in the field of MOF-derived porous carbon box-supported Co3V2O8 composite negative electrode material and its preparation, can solve the problems of poor cycle stability, rate performance, poor conductivity, etc. resistance, the effect of simple experimental operation

Active Publication Date: 2020-03-31
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of the shortcomings of oxide materials such as poor conductivity, cycle stability and rate performance, the purpose of the present invention is to provide a double transition metal oxide Co3V2O8 and porous carbon box, the porous carbon box was obtained by pyrolysis of ZIF-67 with special morphology, and then One-dimensional rod-like Co3V2O8 is attached to the porous carbon box or embedded in its pores to form a composite negative. Through this ingenious Process design and morphology control to improve the electrochemical performance of materials

Method used

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  • MOF-derived porous carbon box loaded Co&lt;3&gt;V&lt;2&gt;O&lt;8&gt; composite negative electrode material and preparation method and application thereof
  • MOF-derived porous carbon box loaded Co&lt;3&gt;V&lt;2&gt;O&lt;8&gt; composite negative electrode material and preparation method and application thereof
  • MOF-derived porous carbon box loaded Co&lt;3&gt;V&lt;2&gt;O&lt;8&gt; composite negative electrode material and preparation method and application thereof

Examples

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Embodiment 1

[0023] This embodiment provides a MOF derived porous carbon box loaded with Co 3 V 2 o 8 Composite negative electrode material and preparation method thereof, comprising the steps of:

[0024](1) Add cobalt nitrate hexahydrate and 2-methylimidazole to methanol and stir for 10 minutes to dissolve, then slowly add 2-methylimidazole solution to cobalt nitrate hexahydrate solution and mix, continue stirring for 6 hours, centrifuge to separate the precipitate and use After washing with ionized water and methanol for several times, ZIF-67 was obtained after drying in a drying oven at 60°C for 6 hours. Put ZIF-67 in N 2 The temperature was raised to 800°C at a rate of 1°C / min, and then kept for 2 hours. After natural cooling to room temperature, it was washed with hydrochloric acid to extract Co, and then washed several times with deionized water and ethanol, and then dried in a drying oven at 60°C for 6 hours to obtain porous Carbon box PCB;

[0025] (2) Add ammonium metavanada...

Embodiment 2

[0028] This embodiment provides a MOF derived porous carbon box loaded with Co 3 V 2 o 8 Composite negative electrode material and its preparation method and application, comprising the following steps:

[0029] (1) Add cobalt acetate tetrahydrate and 2-methylimidazole respectively to a solution mixed with deionized water and methanol at a ratio of 1:1 and stir for 5 minutes to dissolve, then slowly add the 2-methylimidazole solution to cobalt nitrate hexahydrate Mixed in the solution, stirred continuously for 5 hours, centrifuged to separate the precipitate, washed several times with deionized water and methanol, and then dried under vacuum at 80°C for 4 hours to obtain ZIF-67. Raise ZIF-67 to 900°C under Ar with a heating rate of 2°C / min, then keep it warm for 1h, then slowly cool down to room temperature under program control, wash with nitric acid to extract Co, wash with water and ethanol for several times, and store in a drying oven at 80°C After drying for 6 hours, a...

Embodiment 3

[0034] This embodiment provides a MOF derived porous carbon box loaded with Co 3 V 2 o 8 Composite negative electrode material and preparation method thereof, comprising the steps of:

[0035] (1) Add cobalt chloride hexahydrate and 2-methylimidazole to ethanol and stir for 5 minutes to dissolve, then slowly add the 2-methylimidazole solution to the cobalt nitrate hexahydrate solution and mix, continue stirring for 5 hours, then centrifuge to separate the precipitate It was washed several times with deionized water and methanol, and then heated in a water bath at 60°C for 4 hours to obtain ZIF-67. The ZIF-67 was heated to 700°C at a rate of 2°C / min under Ar and then kept at 700°C for 2 hours. After cooling to room temperature naturally, it was washed with phosphoric acid to extract Co, and then washed several times with deionized water and ethanol, and then placed in a dry box for 60 After drying at ℃ for 8 hours, the PCB was obtained;

[0036] (2) Add ammonium metavanadat...

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Abstract

The present invention provides a method for preparing a metal-organic framework compound by using a Co-containing metal-organic framework compound (Metal-Organic Framework, the invention relates to acomposite material formed by loading one-dimensional rod-like Co3V2O8 on a porous carbon box (PCB) obtained by MOF pyrolysis, a preparation method of the composite material and an application of the composite material in a lithium ion battery negative electrode material. The preparation method disclosed by the invention comprises the following steps: preparing a zeolite imidazate skeleton-67 (Zeolitic Imidazolate Frameworks-67, ZIF-67) with a controllable morphology; the preparation method comprises the following steps: taking Co3V2O8 as a template precursor, carrying out high-temperature pyrolysis, carrying out acid pickling to remove Co, carrying out ultrasonic dispersion on the obtained porous carbon box in a solution, carrying out self-assembly by taking the porous carbon box as an internal skeleton through a hydrothermal process, and adhering Co3V2O8 to the surface of the porous carbon box and embedding Co3V2O8 into pores to form the composite material. The whole experiment process does not generate toxic and dangerous substances, the operation is simple and easy to implement, the Co3V2O8-coated PCB has a high specific surface area and a porous structure, the multiplying powerand the cycle performance of the lithium ion battery are effectively improved through the synergistic effect of the composite material, and the Co3V2O8-coated PCB is an excellent lithium ion batterynegative electrode material.

Description

technical field [0001] The invention relates to the technical field of preparation of lithium-ion battery electrode materials, in particular to a MOF-derived porous carbon box loaded with Co 3 V 2 o 8 Composite negative electrode material and its preparation method and application. Background technique [0002] In the face of increasingly severe environmental pollution and energy crisis, it is imperative to develop green, efficient and sustainable clean energy. Since the output energy of clean energy such as solar energy and wind energy requires a certain storage system to be practical, lithium-ion batteries, as secondary batteries with high-efficiency energy conversion and storage, have been continuously researched and developed, and applied to life and other fields. However, in the face of market requirements for high-energy energy storage systems and high capacity, the current electrochemical performance of lithium-ion batteries cannot be well met. Therefore, the deve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/485H01M4/62H01M10/0525B82Y40/00
CPCH01M4/485H01M4/625H01M4/628H01M10/0525B82Y40/00H01M2004/027H01M2004/021Y02E60/10
Inventor 卢芊冯季军冯源源张渤丁鸿宇杨博文
Owner UNIV OF JINAN
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