Chalcopyrite CuFeS2was synthesized by solvothermal method,and used it as cathodic active species for lithium ion battery.Electrochemical test results showed that Li/CuFeS2had a high initial discharge capacity of 1 100mAh/g at a current density of 14mA/g under room temperature.Even under-20 ℃,the initial discharge capacity was still more than 400mAh/g.The Li/CuFeS2had two discharge plateaus for different discharge steps.