I am reading a few papers on batteries and am coming across certain materials with @C after their chemical composition e.g Na3V2(PO4)3@carbon positive electrode. I am not sure what this means exactly.
The major drawback of Na3V2(PO4)3 (NVP) is the relatively low electronic conductivity makes the theoretical capacity of NVP cathodes unviable even at low rates. Therefore, coating or making composite with conductive carbon, denote as NVP@C, is a helpful strategy to overcome this issue.