Matched Facet‐Induced Microflower‐Like Li, Ni‐Codoped Zn3V3O8/V2O3 Nanoplate Assemblies Grown on Bamboo‐Like Carbon Nanotube for High Energy Density Lithium‐Ion Capacitors. Issue 11 (13th October 2020)

• Record Type: Journal Article
• Authors: Bai, Youcun; Hai, Yang; Cui, Leilei; Gong, Yun
• Is Part Of: Energy technology. Volume 9:Issue 11(2021)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2020-10-13
• Subjects: Li-ion capacitors -- matched crystalline planes -- microflowers -- Ni-codoping -- Zn3V3O8/V2O3; Energy development -- Periodicals; Power resources -- Periodicals; 333.79
• DOI: 10.1002/ente.202000701
• Languages: English
• ISSNs: 2194-4288

Abstract

Abstract : Herein, Li, Ni‐codoped Zn3 V3 O8 /V2 O3 @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 Zn3 V3 O8 /V2 O3 nanoplates is based on their matched d spacings, d (311) (Zn3 V3 O8 ) ≈ d (110) (V2 O3 ). The lateral and radial (thickness) directions of the nanoplate are along Zn3 V3 O8 (311) and (111) facets, respectively. Density functional theory (DFT) calculations reveal that the Zn2 VO4 (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 ZnV2 O4 phase is not beneficial for the formation of ZnV2 O4 (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. Abstract : Herein, Li, Ni‐codoped Zn3 V3 O8 /V2 O3 grown on the surface of porous bamboo‐like carbon nanotubes (BCNTs) by stirring at room temperature is reported. Density functional theory (DFT) calculations reveal that the Zn2 VO4 (311/111) heterointerface is thermodynamically favorable, and has good stability.