▎ 摘　　要

Graphene is a special form of carbon which can effectively enhance the critical current density Jc of MgB2. In this work, a systematic investigation on the impact of sintering conditions and doping level was carried out for graphene-doped MgB2 tapes. It is found that an appropriate addition level, i. e., 8 at% in this work, is very critical to obtain a high Jc in graphene-doped samples. The critical field and pinning force are improved obviously due to the graphene doping. The magnetic Jc of samples sintered at 800 degrees C with 8 at% graphene doping reached 1.78 x 10(4) A/cm(2), at 5 T, 20 K. At the same time, the transport Jc was up to 2.38 x10(4) A/cm(2) at 10 T, 4.2 K. The lattice distortion caused by C substitution and residual C at the grain boundaries were thought to be the major factors affecting the Jc of graphene-doped MgB2 samples.