Sea urchin-shaped metal oxide coated silicon-based composite material and preparation method thereof

The invention provides a sea urchin-shaped metal oxide coated silicon-based composite material and a preparation method thereof, and relates to the field of lithium ion batteries. Comprising the following steps: S1, preparing a hard carbon coated nano silicon/carbon nanotube material; s2, hollow sea urchin-shaped iron oxide coating; and S3, surface soft carbon deposition. The prepared sea urchin-shaped metal oxide coated silicon-based composite material has excellent electrochemical stability, excellent rate capability and cycle performance, and has a good application prospect. 本发明提供一种海胆状金属氧化物包覆硅基复合材料及其制备方法，涉及锂离子电池领域。包括如下步骤：S1、硬碳包覆纳米硅/碳纳米管材料的制备；S2、空心海胆状氧化铁包覆；S3、表面软碳沉积。本发明制备的海胆状金属氧化物包覆硅基复合材料具有优异的电化学稳定性，优异的倍率性能和循环性能，具有很好的应用前景。