| Abstract: | SiO_x/graphite anodes have attracted considerable attention in recent years due to their high specific capacity.Unfortunately,a thick solid-electrolyte-interface,which is produced by the decomposition of carbonate-based electrolytes,impedes the diffusion of lithium ions and significantly limits the rate performance of this interesting anode for practical applications.In this work,a LiNO_3additive was introduced during the preparation of an anode electrode paste.The results of SEM,ex and in situ XRD and XPS showed that LiNO_3decomposed into LiN_xO_yand Li_3N,which deposited on the anode surface during the first discharge process.Due to the high ionic conductivity of LiN_xO_yand Li_3N,the rate performance of the SiO_x/graphite anode was significantly improved,showing a specific capacity nearly three times higher than that without the additive.In addition,the decomposition of the electrolyte during cycling was also suppressed by the LiN_xO_yand Li_3N inorganic salts because of their low electronic conductivity and superior robustness.Our approach is facile and easy to scale up,which will be of great significance for the commercialization of SiO_x/graphite anodes. |
