Abstract SiOx/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 LiNO3 additive was introduced during the preparation of an anode electrode paste. The results of SEM, ex and in situ XRD and XPS showed that LiNO3 decomposed into LiNxOy and Li3N, which deposited on the anode surface during the first discharge process. Due to the high ionic conductivity of LiNxOy and Li3N, the rate performance of the SiOx/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 LiNxOy and Li3N 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 SiOx/graphite anodes.

中文翻译：

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通过添加 LiNO3 提高 SiOx/石墨负极的倍率性能

摘要 近年来，SiOx/石墨负极因其高比容量而受到广泛关注。不幸的是，由碳酸盐基电解质分解产生的厚固体电解质界面阻碍了锂离子的扩散，并显着限制了这种有趣的阳极在实际应用中的倍率性能。在这项工作中，在阳极电极糊的制备过程中引入了 LiNO3 添加剂。SEM、ex 和原位 XRD 和 XPS 的结果表明，在第一次放电过程中，LiNO3 分解为 LiNxOy 和 Li3N，并沉积在阳极表面。由于 LiNxOy 和 Li3N 的高离子电导率，SiOx/石墨负极的倍率性能显着提高，显示出比没有添加剂的比容量高出近三倍。此外，由于 LiNxOy 和 Li3N 无机盐的低电子电导率和优异的稳健性，它们在循环过程中也能抑制电解液的分解。我们的方法简便且易于扩大规模，这对 SiOx/石墨阳极的商业化具有重要意义。