A kind of silicon-based composite lithium-ion battery negative electrode material and its preparation method and application
A lithium-ion battery and negative electrode material technology, applied in battery electrodes, non-aqueous electrolyte battery electrodes, secondary batteries, etc., can solve the complex preparation process of nanometer and porous materials, reduce the volumetric energy density of materials, and reduce the tap density of materials, etc. problem, to achieve the effect of reducing the first irreversible capacity, improving cycle stability, and improving electrochemical performance
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Embodiment 1
[0045] Silicon powder (500nm) and iron powder (70-150μm) are used as raw materials, the weight ratio is 2:1, and NH 3 As the ball milling atmosphere, the pressure is 6 bar, ball milling is carried out at 500 rpm in a planetary ball mill, and the ball milling time is 60 hours. The ball mill mixture was reacted with 10wt.% hydrochloric acid to the remaining Fe powder, washed with centrifugal water, and dried in vacuum at 120°C to obtain SiFeSi y / SiO x Negative material. figure 1 and 2 Respectively SiFeSi obtained in this embodiment y / SiO x Scanning electron micrographs and X-ray diffraction (XRD) patterns of composite anode materials. From figure 1 It can be seen that the particle size of the composite material obtained after ball milling is 0.1-1 μm. From the XRD analysis, it can be seen that the composite material contains Si, FeSi and FeSi 2 Mutually. But the peak width of each phase is wider, especially Si. It shows that the crystal grains are small and there is ...
Embodiment 2
[0053] Silicon powder (500nm) and iron powder (70-150μm) are used as raw materials, the weight ratio is 2:1, and H 2 As the ball milling atmosphere, the pressure is 6 bar, ball milling is carried out at 500 rpm in a planetary ball mill, and the ball milling time is 60 hours. The ball milled product was washed with 10wt.% hydrochloric acid Fe powder that did not participate in the reaction, centrifugally washed, and dried in vacuum at 120°C to obtain SiFeSi y / SiO x Negative material. Figure 10 and Figure 11 Respectively SiFeSi obtained in this embodiment y / SiO x Scanning electron micrographs and XRD patterns of negative electrode materials. The particle size of the composite material obtained after ball milling is 0.1-1 μm, and the composite material contains Si, FeSi and FeSi 2 Mutually. The electrochemical performance of the material was tested by the same test method as in Example 1. Figure 12 For the material cycle performance, the material has good cycle perfo...
Embodiment 3
[0056] Silicon powder (500nm) and Mn powder (50-150μm) are used as raw materials, the weight ratio is 2:1, and NH 3 As the ball milling atmosphere, the pressure is 6 bar, the ball milling is carried out at 500 revolutions of the planetary ball mill, and the ball milling time is 60 hours. The ball milled product was reacted with 10wt.% hydrochloric acid to the remaining Cr powder, washed with centrifugal water, and dried in vacuum at 120°C to obtain SiMnSi y / SiO x Negative material. Figure 13 and Figure 14 Respectively SiMnSi obtained in this embodiment y / SiO x Scanning electron micrographs and XRD patterns of negative electrode materials. From Figure 13 It can be seen that the particle size of the composite material obtained after ball milling is 0.1-1 μm. From the XRD analysis, it can be seen that the composite material contains Si, MnSi and Mn 15 Si 26 phase, but the degree of amorphization of each phase is relatively large. The hydrogen ball milling atmospher...
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Abstract
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