Controlled prelithiation of siloxene nanosheet anodes enables high performance 5 V-class lithium-ion batteries

Two-dimensional siloxene nanosheet has attracted great attention as an advanced anode for lithium-ion batteries (LIBs) due to its special characters. However, the high surface area leads to a low initial Coulombic efficiency (ICE) and large irreversible capacity, impeding the further application of siloxene. In this work, controlled chemical prelithiation is designed to overcome the issue. The influences of prelithiated conditions on physical and electrochemical performance are researched. Uniform SEI film and high coulombic efficiency is obtained with a 15 minutes prelithiation process. The prelithiated siloxene anode shows high ICE, superior rate performance and stable cycling performance. When coupled with 5V-class LiNi 0.5 Mn 1.5 O 4 cathodes, an enhanced capacity retention of 94.3% is achieved after 200 cycles. This work may be useful for designing advanced anodes for rechargeable batteries.