Silicon oxides (SiO${}_x$, 0 < $x$ < 2)-based anodes have been regarded as one of the most prospective candidate materials for lithium-ion batteries (LIBs) due to their high theoretical capacity. However, the inherent drawbacks of SiO${}_x$ anodes, especially the severe volume expansion and the inferior Li${}^{+}$ kinetic properties, greatly limit their industrial promotion. Herein, we synthesized a dual-shell coating structural composite (denoted as SiO${}_x$@Ni-MOF@C) through a two-step process. The unique structure effectively mitigates the huge volume variation of SiO${}_x$, which leads to unstable material interfaces and inferior Li${}^{+}$ kinetic characteristics. The as-prepared SiO${}_x$@Ni-MOF@C composite demonstrates an initial charge capacity of 799.2 mAh g${}^{-1}$ with an initial Coulombic efficiency (ICE) of 63.2%, and 515.6 mAh g${}^{-1}$ with a capacity retention of 78.3% after 450 cycles at 1 A g${}^{-1}$. The dual-shell coating design can provide novel insights into other high-capacity anode materials suffering from large volume variations.

硅氧化物 (SiO${}_X$, 0 <$X$<2)基负极由于其高理论容量而被认为是锂离子电池（LIB）最有前景的候选材料之一。然而SiO2固有的缺点${}_X$负极，特别是严重的体积膨胀和劣质的Li${}^{+}$动力学特性，极大地限制了其产业化推广。在此，我们合成了一种双壳涂层结构复合材料（记为 SiO${}_X$@Ni-MOF@C）通过两步过程。独特的结构有效缓解了SiO巨大的体积变化${}_X$，这导致材料界面不稳定和劣质锂${}^{+}$动力学特征。所制备的SiO2${}_X$@Ni-MOF@C复合材料的初始充电容量为799.2 mAh g${}^{-1}$初始库仑效率 (ICE) 为 63.2%，515.6 mAh g${}^{-1}$1 A g 下循环 450 次后容量保持率为 78.3%${}^{-1}$。双壳涂层设计可以为其他遭受大体积变化的高容量阳极材料提供新颖的见解。