New conductive additive in lithium and sodium batteries

The invention pertains to the use of porous, chemically interconnected, carbon nanofibres-comprising carbon networks as a conductive additive in lithium or sodium batteries. It has been found that said carbon-nanofibre comprising carbon networks can beneficially be used in the cathode of lithium or sodium batteries when added in an amount of 0.1-20 wt %, and/or in the anode of lithium or sodium batteries when added in an amount of 0.1-10 wt %. The benefits include a high lifetime (stability over extended cycling), high charge and discharge rate and being resilient during manufacture and use. The porous, chemically interconnected, carbon nanofibres-comprising carbon networks can be used as conductive additive in the anode and/or cathode of lithium or sodium batteries of many areas of technology, such as smartphones, laptops and electric and hybrid vehicles.