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A convenient,self-assembly,ionic liquid-assisted method for the preparation of Ni3S4-MoS2 heterojunction is reported.The Ni3S4 supporter not only proved high conductivity in heterojunction for MoS2,but also showed more compatibility with MoS2 allowing long cycle life.The capacity of Ni3S4-MoS2 heterojunction is 985.21 Fg-1 at a current density of 1 Ag-1,and it can retain 573 Fg-1 after 20000 cycles at a current density of 10 Ag-1.