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Three-dimensional structure MXene/SnO2/C negative electrode composite material and preparation method thereof

A three-dimensional structure, composite material technology, applied in the direction of negative electrodes, structural parts, battery electrodes, etc., can solve the problems of pulverization and peeling of active materials, volume expansion of negative battery materials, battery specific capacity attenuation, etc., to delay the pulverization process, The microscopic crystal structure is stable and the effect of preventing rapid decay

Pending Publication Date: 2022-02-11
新纶新能源材料(常州)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the SnO 2 The huge volume expansion of the negative electrode battery material in the lithium intercalation and delithiation process eventually causes the technical problems of powdering and peeling of the active material and a sharp attenuation of the specific capacity of the battery. The purpose of the present invention is to provide a three-dimensional structure MXene / SnO 2 / C negative electrode composite material significantly improves its cycle life and specific capacitance, which greatly improves the cycle performance of the battery

Method used

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  • Three-dimensional structure MXene/SnO2/C negative electrode composite material and preparation method thereof
  • Three-dimensional structure MXene/SnO2/C negative electrode composite material and preparation method thereof
  • Three-dimensional structure MXene/SnO2/C negative electrode composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] The three-dimensional structure MXene / SnO of this embodiment 2 / C negative electrode composite materials, including MXene and coated SnO 2 A mixture of metal-organic frameworks of nanoparticles, in which SnO 2 Nanoparticles are coated on the surface of the metal-organic framework to form a core-shell structure. Among them, the transition metal in MXene is one or more of Ti, V, and Nb, and the metal-organic framework is ZIF-67.

[0048] refer to figure 1 , the three-dimensional structure MXene / SnO of this example 2 The preparation method of / C negative electrode composite material comprises the following steps:

[0049] S1: Preparation of two-dimensional material MXene

[0050] Add 2gLiF into 20mL hydrochloric acid solution, the concentration of hydrochloric acid is 9M, stir for 30min, and the rotation speed is 400rpm. Then the 2gMAX-Ti 3 AlC 2 Slowly add to the beaker, and the adding process should be controlled over 10 minutes; adjust the reaction temperature t...

Embodiment 2

[0061] This example is basically the same as Example 1, except that the three-dimensional structure MXene / SnO of this example 2 In the preparation method of / C negative electrode composite material:

[0062] S3: Preparation of core-shell structure

[0063] The template was added to the methanol solution of tin chloride, and ultrasonically dispersed for 30 minutes. Add excess NaBH to the mixed solution 4 , Stir vigorously at room temperature for 1 to 2 hours to generate a precipitate. The precipitate was centrifuged and washed alternately with anhydrous methanol and deionized water, 4-8 times each; after washing, it was then dried overnight in vacuum at 60°C. The dried product was heated to 500° C. in a nitrogen atmosphere, then kept at temperature for 2 h, and then cooled to room temperature to obtain a black solid product.

[0064] S5: Chemical performance test

[0065] First, the three-dimensional structure MXene / SnO 2 / C negative electrode composite material, binder, ...

Embodiment 3

[0068] This example is basically the same as Example 1, except that the three-dimensional structure MXene / SnO of this example 2 In the preparation method of / C negative electrode composite material:

[0069] S3: Preparation of core-shell structure

[0070] The template was added to the methanol solution of tin chloride, and ultrasonically dispersed for 30 minutes. Add excess NaBH to the mixed solution 4 , Stir vigorously at room temperature for 1 to 2 hours to generate a precipitate. The precipitate was centrifuged and washed alternately with anhydrous methanol and deionized water, 4-8 times each; after washing, it was then dried overnight in vacuum at 60°C. The dried product was heated to 600° C. in a nitrogen atmosphere, then kept at temperature for 2 h, and then cooled to room temperature to obtain a black solid product.

[0071] S5: Chemical performance test

[0072] First, the three-dimensional structure MXene / SnO 2 / C negative electrode composite material, binder, a...

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Abstract

The invention discloses a three-dimensional structure MXene / SnO2 / C negative electrode composite material and a preparation method thereof. According to the composite material, MXene and a metal organic framework coated with SnO2 nanoparticles are evenly mixed together, the SnO2 nanoparticles are coated on the surface of the metal organic framework to form a core-shell structure, and transition metal in the MXene is one or more of Ti, V and Nb. According to the scheme, the metal organic framework is introduced to serve as a precursor template for fixing transition metal, high conductivity of MXene and the characteristic that the electronic conductivity of the transition metal oxide can be improved when the MXene is compounded with the transition metal oxide are utilized, and the ion migration rate in the charging and discharging process is increased; and meanwhile, the MOF nano material is adopted as a separator between MXene sheet layers to prevent the MXene sheet layers from being stacked, so that active sites on the surface of the MXene material can be utilized most efficiently, and a relatively good synergistic effect is achieved.

Description

technical field [0001] The invention relates to a lithium battery negative electrode composite material and a preparation method thereof, especially a three-dimensional structure MXene / SnO 2 / C negative electrode composite material and preparation method thereof. Background technique [0002] Lithium-ion batteries (LIB, lithium-ion batteries) have received increasing attention in the field of electrochemical energy storage due to their high energy density and long life, and their applications are wide-ranging, including portable electronic devices, electric vehicles, and grid-scale Energy storage system, etc., is a very important type of battery. Lithium ions in LIB move between the positive and negative electrodes during charging and discharging, resulting in energy conversion. In its electrode structure, the specific capacity of the negative electrode material has a crucial impact on battery performance. To further improve the performance of Li-ion batteries, various eff...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/48H01M10/0525
CPCH01M4/628H01M4/625H01M4/624H01M4/483H01M10/0525H01M2004/027H01M2004/021Y02E60/10
Inventor 李晓方龙张建朋
Owner 新纶新能源材料(常州)有限公司
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