隨著電動車與再生能源的發展，具有高能量密度的鋰離子電池備受矚目。在鋰離子電池負極材料中，考慮到矽負極巨大的體積膨脹率(~300 %)，因此目前學者轉向研究同樣具有高比電容量且電池循環穩定性較佳的矽氧基(SiOx)負極材料。
SiOx在首次電化學鋰化過程中，奈米矽會進行合金反應貢獻電容值；而矽氧基材料則進行轉換反應，形成新的矽以及Li2O和不同矽酸鋰相，以當作奈米矽體積膨脹的緩衝層，提升電池循環穩定性，但其大多為不可逆相並會消耗鋰離子，產生首圈庫倫效率(Initial Coulombic Efficiency, ICE)低的問題。除此之外，SiOx還具有本質導電性較差以及體積膨脹率大(100~200 %)的問題。
為了解決上述問題，本研究將SiOx負極粉材進行導電碳披覆，再以粉材形式進行化學預鋰化以及鍛燒過程。藉由預鋰化參數調控，了解能有效提升SiOx粉材電化學性能的最佳矽酸鋰相組成。在後續對SiOx、SiOx@C以及Pre-SiOx@C粉材分析中，可以發現在預鋰化後碳披覆結構發生改變，且其導電性和導離性與SiOx相比皆提升，同時ICE以及循環穩定性為三者最佳，代表該改質粉末將有利於未來發展高能量密度的鋰離子電池。

As electric vehicles and renewable energy advance, silicon oxide-based (SiOx) materials are gaining attention for lithium-ion batteries due to their high specific capacity and improved cycle stability compared to silicon anode material. During SiOx lithiation, nano-sized silicon undergoes alloy reactions, contributing to capacity, while SiOx undergoes conversion reactions, forming new silicon, Li2O, and various lithium silicate phases. These phases act as a buffer layer, mitigating volume expansion and enhancing cycle stability. However, these reactions are mostly irreversible, resulting in low initial coulombic efficiency. Also, SiOx faces challenges related to poor intrinsic conductivity and high volume expansion rate. To overcome these issues, this study employs conductive carbon coating on SiOx powder, followed by chemical pre-lithiation and calcination process. The modified SiOx powder (Pre-SiOx@C) exhibits improved conductivity, ionic conductivity, initial coulombic efficiency, and cycle stability compared to SiOx, showing promise for the development of high-energy-density lithium-ion batteries.

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