Abstract:

Graphene loaded nano-sized CoS₂ were prepared by secondary hydrothermal method.The properties of nano-sized CoS₂/GP composites as anode materials for lithium ion batteries were studied by structural characterization and electrochemical performance testing.The capacitance test results showed that the first cycle charge-discharge capacity of CoS₂/GP composite were 1 610 mA·h/g and 774 mA·h/g respectively at 100 mA/g current density.And the calculated coulomb efficiency was 48.1%.The cycle performance test results showed that the specific discharge capacity was 302 mA·h/g and the capacity retention rate was 33.4% after 50 times cycles.The rate performance test results showed that when the current density teturned to 100 mA/g,the specific capacity restored to 550 mA·h/g.CoS₂/GP composites anode exhibited excellent cycling and rate performance.

Key words: nano-sized CoS₂, grapheme, lithium battery, electrochemical