Silicon oxides (SiOx) have received extensive attention as an promising anode candidate for next‐generation lithium‐ion batteries (LIBs). However, their commerical applications have been seriously hindered by low conductivity, large volume expansion and unstable soild‐electrolyte interface (SEI) layer, which result in low intial coulombic efficiency, poor rate performance and short cycling lifepan. In this work, we demonstrate a simple way to prepare a series of SiOx materials with lithium fluoride (LiF) modified by hydrothermal method and carbothermal modification. When the mass ratio of SiOx and LiF equals 1:0.15, the long‐term cycling capacity retention can be greatly improve form 30.2% to 76.7% after 200 cycles. The result is primarily because the enhancement of electrons and Li+‐ions transport and the stability of SEI layer due to LiF addition. However, excess LiF addition can hinder the diffusion of Li+‐ions. This study presents the great potential of LiF modified on SiOx anode materials for LIBs.

中文翻译：

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合成高密度锂离子电池稳定 SiOx 基负极的有效策略


硅氧化物（SiOx）作为下一代锂离子电池（LIB）的有前景的阳极候选材料而受到广泛关注。然而，它们的商业应用受到低电导率、大体积膨胀和不稳定的固体电解质界面（SEI）层的严重阻碍，导致初始库仑效率低、倍率性能差和循环寿命短。在这项工作中，我们展示了一种通过水热法和碳热改性制备一系列氟化锂（LiF）改性SiOx材料的简单方法。当SiOx和LiF的质量比等于1:0.15时，200次循环后长期循环容量保持率可以从30.2%大幅提高到76.7%。结果主要是因为LiF的添加增强了电子和Li+离子的传输以及SEI层的稳定性。然而，过量的LiF添加会阻碍Li+离子的扩散。这项研究展示了在 SiOx 阳极材料上修饰的 LiF 在锂离子电池中的巨大潜力。