▎ 摘　　要

Heterointerface plays the key role to adjust and enhance the charge carrier transport behavior of composite electrode materials in Li-ion batteries. However, fabricating heterostructures with suitable band gap and exquisitely distributed architectures is still a challenge to realize excellent electrochemical performance. Herein, heterogeneous CoO@Co9S8-rGO hollow nanocube is prepared via surface-seeding and secondary growth followed by subsequent sulfuration and carbonization processes. In this smart design of hollow CoO@Co9S8-rGO heterointerface architecture, the built-in electric field between CoO and Co9S8 helps to quicken the Li-ions transport in lithiation and delithiation processes. The abundant CoO-Co9S8 heterointerface exposes more active sites and facilitates the infiltration of electrolyte and Li-ion storage. In-situ generated CoO nanosheet could be a bridge between Co9S8 nanocube and graphene which endows the excellent electron transport channel. As expected, the CoO@Co9S8-rGO electrode exhibits a remarkable reversible discharge capacity (912 mAh g(-1) at 0.1 A g(-1)), high rate performance (586 mAh g(-1)at 5 A g(-1)), and excellent cycling stability (600 mAh g(-1) at 1 A g(-1) after 500 cycles). This work provides an effective strategy for constructing heterostructure anode to enhance the Li-ion transfer and storage.