Enhancing long-term cycling stability of lithium-ion batteries with prelithiated MXene@SiO2 anodes

The pulverization and volume expansion of silica (SiO2) particles during the continuous lithiation/delithiation process have great impacts on the long-term cycling stability for lithium-ion batteries (LIBs). Herein, a stable and robust solid electrolyte interphase (SEI) containing abundant LiF and Li2CO3 species was realized through MXene integration and prelithiation for SiO2 electrodes. The as-generated SEI displayed well electron insulator capability and fast Li+ transport kinetics owing to the synergistic effect of LiF and Li2CO3, as well as the excellent mechanical properties with the contributions of MXene layers. Therefore, the prelithiated MXene@SiO2 anodes achieved a high capacity of 380.2 mAh g-1 and a long cycling stability with a capacity retention of 88.3% after 600 cycles at the current density of 100 mA g-1. This work provided a deep understanding on the SEI structure and its efficiency on the cycling stability for high energy anodes.