Lithium ion battery negative electrode composite material and preparation method and application thereof
A technology of lithium ion battery and composite material, applied in the field of lithium ion battery negative electrode composite material and its preparation, can solve the problem of poor cycle stability of germanium negative electrode, and achieve the effects of accelerated transmission, large specific surface area and simple preparation process
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Embodiment 1
[0047] This example provides a lithium-ion battery negative electrode composite material and a preparation method thereof, the composite material includes MXene material, a carbon layer formed on the surface and interlayer of the MXene material and capable of conducting electricity, and uniformly distributed in the carbon layer The germanium element, the particle size of the germanium element is nanometer size, and its structural schematic diagram is as follows figure 1 As shown, the MXene material exists in a layered structure and serves as a support for the overall material. The carbon layer basically covers the outer surface of the MXene material and fills the interlayer of the MXene material, while the germanium element is distributed in the carbon layer. The interlayer surface area of the material is much larger than the outer surface area, therefore, a very small amount of germanium is distributed on the outer surface of the MXene material, only in the figure 1 The dis...
Embodiment 2
[0060] This example provides a lithium-ion battery negative electrode composite material and a preparation method thereof, the composite material includes MXene material, a carbon layer formed on the surface and interlayer of the MXene material and capable of conducting electricity, and uniformly distributed in the carbon layer germanium elemental substance, the particle size of the germanium elemental substance is nanometer size.
[0061] Its preparation method comprises the following steps:
[0062] Add 0.5g of germanium dioxide and 0.25g of dopamine into 100g of deionized water, add 1g of 25% ammonia and stir for 10 minutes to obtain a mixed solution, and add 0.5g of Ti 2 C 2 MXene material and 100g of ethanol were added to the above mixed solution, stirred and reacted at 35°C for 24 hours, centrifuged and dried to obtain MXene / Ge 4+ The compound precursor;
[0063] Take 0.3g of MXene / Ge 4+ The composite precursor is placed in a tube furnace, and annealed at 800°C for ...
Embodiment 3
[0066] This example provides a lithium-ion battery negative electrode composite material and a preparation method thereof, the composite material includes MXene material, a carbon layer formed on the surface and interlayer of the MXene material and capable of conducting electricity, and uniformly distributed in the carbon layer germanium elemental substance, the particle size of the germanium elemental substance is nanometer size.
[0067] Its preparation method comprises the following steps:
[0068] Add 0.2g of germanium dioxide and 0.4g of dopamine into 100g of deionized water, add 1g of sodium hydroxide and stir for 10 minutes to obtain a mixed solution, and add 0.5g of Ti 4 N 3 MXene material and 50g of ethanol were added to the above mixed solution, stirred and reacted at 30°C for 12 hours, centrifuged and dried to obtain MXene / Ge 4+ The compound precursor;
[0069] Take 0.5g of MXene / Ge 4+ The composite precursor is placed in a tube furnace, and annealed at 900°C f...
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Abstract
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