Abstract: An industrially by-product carbon nanopowder was reused as the raw material to make cathodes of lithium cell for the purpose of reducing cost and improving performance. After the purification of the carbon nanopowder, its purify was measured with an electrochemical investigation done for the lithium embedding behavior. The results of charge/discharge test showed that for the nanopowder the discharging specific capacity was 358.3mA·h/g, the first rechargeable capacity was 336.4 mA ·h/g and 76.1% of rechargeable capacity could be held on after the 9th recharging actions done. The TEM result showed that the morphology of the nanopowder particles were spherical with a diameter about 30 nm, and the XRD result showed structurally that its interlayer distance, d002 was 0.3481 nm, i.e., between that of graphite and of soft carbon.