Lithium-ion insertion properties of one-dimensional layered rhenium phosphide

Abstract

Metal phosphides have aroused great interest among the electrochemical community due to their stunning performance, including good electrical conductivity, high theoretical capacity, and considerable cycling stability. In this work, we synthesized and utilized Re6P13 for the first time as a promising anode material for lithium-ion batteries (LIBs). High-purity Re6P13 needle-like crystals were successfully grown by a chemical vapor transport method. Surface modification of Re6P13 by conductive carbon results in Re6P13 @C composite electrode, exhibiting a high specific capacity of 1265 mAh g−1 at 0.1 A g−1. The calculated band structure of Re6P13 reveals a highly symmetric point path that is beneficial for achieving high electrical conductivity and good structural flexibility. These features further empower the Re6P13 @C composite anodes with good cycling life (775 mAh g−1 at 1 A g−1 after 100 cycles) and rate performance (558 mAh g−1 at 20 A g−1). This work suggests that Re6P13 compounds with needle-like structures are promising anode materials for LIBs.