Matched Facet-Induced Microflower-Like Li, Ni-Codoped Zn3V3O8/V(2)O(3)Nanoplate Assemblies Grown on Bamboo-Like Carbon Nanotube for High Energy Density Lithium-Ion Capacitors

Herein, Li, Ni-codoped Zn3V3O8/V2O3@bamboo-like carbon nanotube (BCNT) is synthesized as an anode for a Li-ion capacitor (LIC), which exhibits a high capacity and excellent cycling stability. The capacity retention is 91.0% after 2000 cycles at 5 A g(-1). Meanwhile, the formation mechanism of the hierarchical morphology of LNZVO@C is investigated. It is expected that the formation of Zn3V3O8/V(2)O(3)nanoplates is based on their matcheddspacings,d((311))(Zn3V3O8) approximate to d((110))(V2O3). The lateral and radial (thickness) directions of the nanoplate are along Zn3V3O8(311) and (111) facets, respectively. Density functional theory (DFT) calculations reveal that the Zn2VO4(311/111) heterointerface is thermodynamically favorable, and its good stability is associated with the charge transfer from the V atoms on the (111) surface to the V atoms on the (311) surface. Although the existence of ZnV(2)O(4)phase is not beneficial for the formation of ZnV2O4(311)/(111) interface, it favors the improvement of electron conductivity. Meanwhile, a KOH-activated BCNT is designed as the cathode for LIC, which shows a relatively high capacity. The LNZVO@C//FBCNT LIC with carbon nanotube-derived cathode and anode can provide high energy densities.