Electrophysical properties of composites Li3V2(PO4)3/graphene and Li3V2(PO4)3/CNT
Alexander A. Petrunin 1, Pavel V. Barkov, Vladislav V. Shunaev 1 and Olga E. Glukhova 1,2,*
1 Institute of Physics, Saratov State University, Astrakhanskaya Street 83, 410012 Saratov, Russia;
2 Laboratory of Wearable Biocompatible Devices and Bionic Prostheses, I.M. Sechenov First Moscow State Medical University, Trubetskaya Street 8-2, 119991 Moscow, Russia
Abstract
We conducted experimental and quantum-chemical studies of electrode composites based on lithium-vanadium phosphate Li3V2(PO4)3 (LVP) with carbon nanomaterials (carbon nanotubes (CNT), graphene). As the mass fraction of LVP in the composite with carbon nanomaterials increases, the quantum capacity also increases. In the case of the mass ratio m(Li3V2(PO4)3):m(graphene) = 1:6 the quantum capacity value at 0 V is 402.30 F/g, 1:3 is 705.69 F/g, 1:1 is 1494.10 F/g, 3:1 is 2185.96 F/g, 6:1 is 3184.27 F/g. The quantum capacity values in the range -3 ≤ U ≤ -1V are almost identical for all composites under consideration. At 0 V a maximum is observed, which falls as the phosphate concentration decreases. The peak at 1 V, characteristic of the quantum capacity of pure phosphate, decreases with decreasing LVP content and disappears altogether when the mass ratio of components is 1:1.
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A. A. Petrunin
Institute of Physics, Saratov State University, Astrakhanskaya Street 83, 410012 Saratov, Russia Russian
Russian
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