Graphene\nNanoribbon/V₂O₅ Cathodes in Lithium-Ion Batteries

Abstract

Nanocrystalline\nV₂O₅ particles were successfully entrapped by\ngraphene nanoribbons (GNRs) derived from unzipped carbon nanotubes.\nThe electrical conductivity of V₂O₅ nanoparticles\nwas enhanced after introducing the GNRs. The 3-dimensional conductive\nframework in the composites plays a significant role in improving\nthe rate performance and cyclability of the material when used as\na cathode in lithium-ion batteries. By tailoring the mass ratio between\nthe GNRs and the V₂O₅ nanoparticles, the fabricated\ncomposites can deliver a high capacity of 278 mAh g^–1 at 0.1 <i>C</i>, which is close to its theoretical value,\nwhereas a capacity of 165 mAh g^–1 can be maintained\nat 2 <i>C</i>. The delivered capacity at 0.1 <i>C</i> can maintain 78% of its initial capacity after 100 cycles.