ABSTRACT Silicon oxide (SiO) is becoming the main anode for high‐energy lithium‐ion batteries because of its ease of manufacture, outstanding cycling stability, and high capacity. However, low initial Coulombic efficiency (ICE) caused by the irreversible reaction of silica, as the main issue, strictly limits its commercial applications. A high ICE prelithiated SiO@C (P‐SiO@C) anode was developed using a simple one‐step industrialized strategy with lithium hydride (LiH) as the reducing agent. The test results indicate that adding LiH to the carbon‐coated SiO (SiO@C) material can significantly enhance the ICE from 75.93% (SiO@C) to 90.25% (P‐SiO@C‐800) and also promote cycling performance with a 68.14% capacity retention rate after 200 cycles at 1 A g −1 . Full coin‐type cells assembled with LiFePO 4 cathode and P‐SiO@C‐800 anode display impressive rate and cycle properties. Commercial‐grade cylindrical batteries of 3200 mAh g −1 with LiNi 0.8 Co 0.1 Mn 0.1 O 2 also displayed a high ICE of 90.14% and a capacity retention rate of 92.56% at a 1C‐rate after 300 cycles. This one‐step prelithiated preparation strategy for SiO@C provides a good idea for its industrial production.
Mei et al. (Sun,) studied this question.