Low initial coulombic efficiency (ICE) and poor long-term cycling performance are key issues of silicon (Si) anode for lithium-ion batteries (LIBs), due to the irreversible consumption of Li ion. Herein, Si with corn-like structure is synthesized by a simple and low cost magnesiothermic reduction method from pre-treated sepiolite ore. The ICE of corn-like Si reaches 75.1% and can be increased to almost 100% by a simple surface prelithiated engineering, meanwhile the charge capacity remains 788 mAh·g^-1 (0.56 mAh·cm^-2) after 500 cycles at 1 A·g^-1(0.71 mA·cm^-2). Further SEM observation reveals that the prelithiated Si electrode keeps the original corn-like structure during cycling, confirming that available-Si from natural clay is applicable for the production of LIBs.

由于锂离子的不可逆消耗，低初始库仑效率 (ICE) 和较差的长期循环性能是锂离子电池 (LIB) 硅 (Si) 负极的关键问题。在此，具有玉米状结构的硅是通过一种简单且低成本的镁热还原方法从预处理的海泡石矿石中合成的。玉米状硅的 ICE 达到 75.1%，通过简单的表面预锂化工程可以提高到几乎 100%，同时在 1 A下循环 500 次后充电容量保持在 788 mAh·g ^-1 (0.56 mAh·cm ^-2  ) ·g ^-1 (0.71  mA·cm ^-2）。进一步的 SEM 观察表明，预锂化的硅电极在循环过程中保持了原始的玉米状结构，证实了天然粘土中的可用硅可用于生产 LIB。