Preparation and Electrochemical Properties of Hollow FeS2/NiS2/Ni3S2@NC Cube Composites
A novel composite hollow FeS2/NiS2/Ni3S2@NC cube is synthesized through collaborative etch-precipitation(CEP)route,high-temperature calcination,polydopamine coating and high-temperature vulcanization with a pre-prepared Cu2O cube as sacrificial template.The preparation process is safe,while Ni and Fe are successfully incorporated through the CEP route.The hollow cube structure can ef-fectively restrain the volume expansion and slow down the mechanical stress caused by lithium-ion em-bedding and release.The introduction of N-doped carbon layer(NC)can greatly improve the conductivity and structural stability of the composite material,so that it can better maintain the stability of the cube structure.Furthermore,after 100 cycles at a current density of 0.2 A·g-1,the specific discharge capacity of the FeS2/NiS2/Ni3S2@NC cube composite can be maintained at 899.4 mAh·g-1,showing high specific capacity,good cycle stability,and great rate performance(427.5 mAh·g-1 at 3.0 A·g-1).
compositelithium-ion batteriesanode materialstransition metal sulfides
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