Enhanced Lithium Storage Performance in Si/MXene Porous Composites

As a potential negative electrode material for lithium-ion batteries (LIBs), silicon has relatively high specific lithium storage capacity. However, the large volume change during cycle may result in isolation with current collector and therefore rapid capacity decay cycling. The poor electric conductivity of limits high-power density application LIBs. To meet above challenges, stable Si/Ti3C2Tx composite was designed. Si nanoparticles are bonded -NH2 group so that surface positive charge, which can then be electrostatic self-assembly negatively charged MXene nanosheets facile freeze-drying method. Silicon were anchored on or inside interspace nanosheets, could improve composites. (NH2-Si/MXene) presented porous structure extra room expansion plentiful channels carrier transportation. Benefiting from improved structural stability enhanced charge dynamics, discharge NH2-Si/MXene is 1203.3 mAh g−1 after 100 cycles at 200 mA g−1. These results provide new insights silicon-based materials high-energy-density