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The study provides key findings on the unexplored redox chemistry of V metal for anode property in LiVP2O7/C composite, for the demonstration of appreciable specific capacity in lithium ion cell assembly, and arguably interesting rate capability behavior at 10 C conditions. Further, the study provokes renewed interest in pyrophosphates for a systematic revisit and opens a newer horizon of research, wherein ample scope remains to fine-tune pyrophosphate chemistry for energy storage and management.
LiVP2O7/C, popularly known so far as an environmentally compatible and economically viable lithium battery cathode material, was exploited for the first time as an anode through the current study. LiVP2O7/C was synthesized by adopting oxalyl dihydrazide assisted solution combustion method and explored as an anode material in rechargeable lithium cell assembly. Notably, an initial capacity of 600 mAh g–1 was exhibited by LiVP2O7/C anode, at the rate of 0.5 C along with an excellent Coulombic efficiency of 99% up to 150 cycles. The title anode demonstrates its suitability for high capacity and high rate applications by way of exhibiting appreciable capacity values of 200, 150, 120, and 110 mAh g–1, under the influence of 2, 4, 6, and 8 C rates, respectively. Further, LiVP2O7/C anode, when subjected to a high current 10 C rate, exhibits an acceptable capacity of 107 mAh g–1 up to 500 cycles, which is closer to its theoretical capacity value of 117 mAh g–1. The study demonstrates the possibility of exploiting LiVP2O7/C as yet another potential anode and thereby opens a newer avenue to explore wide variety of LiMP2O7/C composites for their probable anode behavior in rechargeable lithium batteries.
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