The electrical and electrochemical properties of graphene nanoplatelets modified 75V2O5-25P2O5 glass as a promising anode material for lithium ion battery

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 V2O5-P2O5 and in this work we synthesized pristine and 7.5% GNP modified 75V(2)O(5)-25P(2)O(5) and used for the first time as anode for lithium-ion batteries; the anodes delivered with corresponding first discharge capacities of similar to 1400 and similar to 1600 mA h g(-1) (almost equal to theoretical capacity of V2O5 1472 mA h g(-1) during a fully reduction from V5+ to V-0), 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 75V(2)O(5)-25P(2)O(5) than unmodified composite, with the capacity retention of 89% with respect to 10th cycle discharge capacity. The electrical conductivity of 75V(2)O(5)-25P(2)O(5) drastically increases with GNP modification. The superior electrochemical performance of 75V(2)O(5)-25P(2)O(5)-7.5% GNP attributed to the high electronic and ionic conductivity of graphene nano-platelets. (C) 2017 Elsevier B.V. All rights reserved.