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
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[0046] (Example 1)
[0047] 3D structure of this example MXENE / SNO 2 / C negative electrode composite, including MXENE and covered SNO 2 Mixed mixture mixed with metal organic frame of nanoparticles, where SNO 2 The nanoparticles are coated on the surface of the metal organic frame nucleation - shell structure. Among them, the transition metal in MXENE is one or more of Ti, V, and NB, and the metal organic frame is ZIF-67.
[0048] Refer figure 1 , Three-dimensional structure of the present embodiment MXENE / SNO 2 The preparation method of the / C negative electrode composite includes the following steps:
[0049] S1: Preparation of two-dimensional material MXENE
[0050] 2 glif was added to a 20 ml hydrochloric acid solution, the concentration of hydrochloric acid was 9 m, stirred for 30 min, and the rotational speed was 400 rpm. Then 2GMAX-TI 3 ALC 2 In the beaker, the addition process should be controlled in 10 minutes; the reaction temperature was adjusted to 35 ° C, contin...
Example Embodiment
[0060] (Example 2)
[0061] The present embodiment is substantially the same as that of Example 1, there is a difference in: three-dimensional structure of the present embodiment MXENE / SNO 2 / C negative electrode composite preparation method:
[0062] S3: Preparation of core - shell structure
[0063] The template was added to the methanol solution of tin chloride, and the ultrasound was dispersed for 30 min. Add excess NABH to mixed solutions 4 The precipitate was produced at room temperature for 1 to 2 hours at room temperature. The precipitate was centrifuged with anhydrous methanol and deionized water, and each washed 4 to 8 times; after washing, then dried overnight at 60 ° C in vacuo. The dry resulting product was warmed to 500 ° C in a nitrogen atmosphere of 500 ° C for 2 h, and then cooled to room temperature to obtain a black solid product.
[0064] S5: Chemical performance test
[0065] First, 3D structure MXENE / SNO 2 / C negative electrode composite, adhesive, acet...
Example Embodiment
[0067] (Example 3)
[0068] The present embodiment is substantially the same as that of Example 1, there is a difference in: three-dimensional structure of the present embodiment MXENE / SNO 2 / C negative electrode composite preparation method:
[0069] S3: Preparation of core - shell structure
[0070] The template was added to the methanol solution of tin chloride, and the ultrasound was dispersed for 30 min. Add excess NABH to mixed solutions 4 The precipitate was produced at room temperature for 1 to 2 hours at room temperature. The precipitate was centrifuged with anhydrous methanol and deionized water, and each washed 4 to 8 times; after washing, then dried overnight at 60 ° C in vacuo. The dried resulting product was warmed to 600 ° C in a nitrogen atmosphere of 2 h, and then cooled to room temperature to obtain a black solid product.
[0071] S5: Chemical performance test
[0072] First, 3D structure MXENE / SNO 2 / C negative electrode composite, adhesive, acetylene black...
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