▎ 摘　　要

The amorphous FePO4 are potential cathode materials for Li and Na ion batteries, due to its low costs, environmental benignity, satisfactory thermal stability and suitable voltage. Especially, its amorphous structure without apparent structure confinement is conducive to the isotropic ion transport. However, it suffers from the extremely low electronic conductivity, resulting in sluggish kinetics during cycling process. Herein, a novel bowl-like double carbon layer architecture is introduced to design and construct hollow carbon@FePO4@reduced graphene oxide composite, in which bowl-like hollow carbon covered with amorphous FePO4 nanoparticles acts as an internal skeleton as well as the reduced graphene oxide tight wrapped serves as an external framework. The bowl-like double carbon layer architecture greatly improves the electron transportation and decreases the excessive hollow interior space while reserving the general advantages of hollow structures. As a result, the as-synthesized composite as cathode materials exhibits excellent sodium and lithium storage properties in the aspect of high capacity, excellent rate capability, especially pre-eminent cycling stability. Kinetic analysis indicates that the charge storage in composite presents pseudocapacitive contribution, which is responsible for the improved electro-chemical properties. (C) 2019 Elsevier B.V. All rights reserved.