Silicon negative electrode material and preparation method and application thereof
A silicon anode and silicon-manganese alloy technology, applied in the field of materials, can solve the problems of polluted environment, electrochemical performance degradation, low yield, etc., and achieve the effects of simple processing process, increased active sites, and increased contact area.
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Embodiment 1
[0028] Take 1g Mn 60 Si 14 The powder was used as a precursor, slowly added to 100mL HCl solution (12mol / L), and reacted at room temperature for 120h until no bubbles appeared. The reactants were centrifuged and vacuum-filtered, washed and dried in vacuum at 80° C. for 24 hours.
[0029] according to figure 1 and figure 2 The comparison of the XRD diagrams shows that after the silicon-manganese alloy is treated with hydrochloric acid, there is no peak of Mn element in the figure, indicating that the Mn element disappears. according to image 3 and Figure 4 It can be seen from the comparison of the SEM images that image 3 It is the shape of manganese-silicon alloy before etching, and no layered structure appears. After hydrochloric acid etching treatment, Figure 4 There is an obvious layered structure, and the etching is very obvious, indicating that the Mn element has reacted with hydrochloric acid. Tested by EDS from Figure 5 It can be seen that all Mn elements...
Embodiment 2
[0031] Take 1g Mn 60 Si 14 The powder was used as a precursor, slowly added to 200mL HCl solution (6mol / L), and reacted at room temperature for 120h until no bubbles appeared. The reactants were centrifuged and vacuum-filtered, washed and dried in vacuum at 80° C. for 24 hours.
Embodiment 3
[0033] Take 1g Mn 60 Si 14 The powder was used as a precursor, slowly added to 160mL HCl solution (7.5mol / L), and reacted at room temperature for 120h until no bubbles appeared. The reactants were centrifuged and vacuum-filtered, washed and dried in vacuum at 80° C. for 24 hours.
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