Regulating interlayer spacing and surface terminations of N-doped 3D MXenes with high-rate Li-ion storage capability

Extending the interlayer spacing and modifying the surface terminations are of significance to improve the electrochemical performance of MXenes. Furthermore, the restacking of MXenes hinder the full utilization of their functional surfaces and further development. Here we devise a high-rate capability anode material of Ndoped 3D MXene for LIBs, by simultaneously extending the interlayer spacing and modifying the surface terminations of MXene, through electrostatic adsorb and pyrolysis of the positively charged melamine. Such an Ndoped 3D T3C2Tx with extended interlayer spacing and modified surface terminations is successfully used as an anode material to enable a high specific capacity of 411.5 mAh/g and a high-rate capability of 248.5 mAh/g at 1 A/g for LIBs.