Abstract：Amorphous silicon (a-Si) powder with layered structure was prepared by chemical delithiation from Li13Si4 compounds and the ball milling modification of a-Si was carried out subsequently. The hydrogenation behavior of the a-Si before and after modification in H2 and the effect of hydrogenation treatment on the electrochemical hydrogen storage performance of the a-Si electrode in proton conducting ionic liquid were investigated. The results showed that ball milling could obviously reduce the particle size of a-Si, but it introduced Fe, Cr impurities and formed Fe2Si and CrSi2. The structure of SiHx were composed of SiH, SiH2 and SiH3. Crystallization of a-Si occurred gradually during hydrogenation and a-Si were completely crystallized when the hydrogenation time was more than 8h. Ball milling contributed to increase the initial hydrogen absorption of a-Si and the hydrogen absorption increased gradually with the hydrogenation time prolonged, while the hydrogen absorption of a-Si for 2h, 5h, 8h and 58h were 0.38wt.%, 0.76wt.%, 0.91wt.% and 3.8wt.%, respectively, but the rate of hydrogen absorption in later stage were relatively slow. There were electrochemical hydrogen absorption and desorption activity for a-Si electrode in proton conducting ionic liquid, but its discharge capacity were relatively low (42~163mAh/g), which the a-Si with ball milling and hydrogenation for 8h had the maximum discharge capacity 163mAh/g after 20 cycles. Ball milling modification and proper hydrogenating treatment (8h) were favorable to improve the discharge capacity of a-Si electrode.
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