Lithium metaaluminate coated silicon-carbon composite material as well as preparation method and application thereof

The invention discloses a lithium metaaluminate coated silicon-carbon composite material and a preparation method and application thereof.The lithium metaaluminate coated silicon-carbon composite material is of a core-shell structure composed of an inner core and an outer shell, the inner core is a silicon-carbon material, and the outer shell is a lithium metaaluminate amorphous carbon complex; according to the invention, the ionic conductivity of the silicon-carbon composite material is obviously improved, and the rate capability, the first efficiency and other related performance of the battery applied with the silicon-carbon composite material are obviously improved. 本发明公开了一种偏铝酸锂包覆硅碳复合材料及其制备方法和应用，偏铝酸锂包覆硅碳复合材料为由内核和外壳组成的核壳结构，其中，内核为硅碳材料，外壳为偏铝酸锂无定形碳复合体；本发明显著提升了硅碳复合材料的离子导电率，明显提升了其应用电池的倍率性能及其首次效率等相关性能表现。