The electrical and electrochemical properties of graphene nanoplatelets modified 75V2O5e25P2O5 glass as a promising anode material for lithium ion battery

Abstract

A V2O5 anode material significantly challenged on its further development to be used in lithium ion batteries in-terms of its structural degradation, poor cyclability and low conductivity. Thus researchers started to work on composite matrix such as V2O5eP2O5 and in this work we synthesized pristine and 7.5% GNP modified 75V2O5e25P2O5 and used for the first time as anode for lithium-ion batteries; the anodes delivered with corresponding first discharge capacities of ~1400 and ~1600 mA h g-1 (almost equal to theoretical capacity of V2O5 1472 mA h g-1 during a fully reduction from V5þ to V0), respectively. The rapid capacity fade was observed in the first few initial cycles (up to 10th cycle) for both materials; however highest discharge capacity of 446 mAh g-1 was retained after 100th cycles for 7.5% GNP modified 75V2O5e25P2O5 than unmodified composite, with the capacity retention of 89% with respect to 10th cycle discharge capacity. The electrical conductivity of 75V2O5e25P2O5 drastically increases with GNP modification. The superior electrochemical performance of 75V2O5e25P2O5e7.5%GNP attributed to the high electronic and ionic conductivity of graphene nano-platelets.