Formation of N‐Doped Carbon Nanofibers Decorated with MoP Nanoflakes for Dendrite‐Free Lithium Metal Anode

Abstract Metallic lithium (Li) is recognized as a promising candidate for anode material of Li‐ion batteries owing to high theoretical specific capacity and low redox potential. However, uncontrollable dendrite growth and huge volume expansion during Li plating/stripping processes hinder its practical application. Herein, N‐doped carbon nanofibers@MoP nanoflakes (NCNF@MoP) is developed as a potential host to address the above challenges. During the formation of solid electrolyte interphase, MoP nanoflakes can be changed into metallic Mo with high lithiophilicity and Li 3 P with high ionic conductivity. The whole composite host is transformed into a mixed ion/electron conducting network to reduce nucleation overpotential and accelerate diffusion kinetics at the electrode/electrolyte interface. As a proof of concept, the symmetric cell using NCNF@MoP host presents a long‐term cycling up to 2500 h with a low nucleation overpotential of 10 mV at 1 mA cm −2 . Additionally, the Li‐NCNF@MoP||LiFePO 4 full cell demonstrates a good capacity retention of 92.6% over 2200 cycles at a high current density of 5 C (1 C = 169 mA g −1 ).