Abstract
A new nanofibrous material, consisting of a conductive carbon core and an external layer made of vanadium oxide, has been studied as a cathode for aluminium-ion batteries. The material enables a mixed-ion intercalation mechanism, resulting in the alternating insertion of Al3+ and in the and carbon layers, respectively. This is a highly desirable feature for cathode materials which may increase the energy density of future batteries by optimising the utilisation of the electrolyte.
Highlights
–) by icoonms buipnoinngcthhaergtwinog,mwatheirliealVs2iOn 5onheascabteheondes,haowmnixteodf-aiocnilimtaetechthaneiisnmsecrotiuolnd of Al3+ on take place, allowing for an increased energy density
We present a material that aims at similar properties, and exploits the synergistic effects of carbon and vanadium oxide to enable a mixed-ion intercalation mechanism
In order to achieve such a material, a nanofibrous core/sheath structure was prepared by adaption of a method first described by Li et al.,[11] in which a solvothermal synthesis was used to grow nstarnaoigshtrtufocrtuwraerddV: 2fiOrs5t,oCn Na Fcasrwboenrenasynnotfihberseis(eCdNtFh)rosuugbhstraatwe.elTl-hkenporwenpapraroticoendmureethinovdoflovrinthgisthme aetleerciatrlowspaisnrneilnagtivaenldy carbonisation of polyacrylonitrile[12], a solvothermal process was performed on the fibres, followed by thermal annealing, to grow V2O5 nanosheets on the surface of the CNFs
Summary
–) by icoonms buipnoinngcthhaergtwinog,mwatheirliealVs2iOn 5onheascabteheondes,haowmnixteodf-aiocnilimtaetechthaneiisnmsecrotiuolnd of Al3+ on take place, allowing for an increased energy density. A few conclusions can be drawn from the behaviour observed in the galvanostatic charge-discharge test: the presence of a much longer charge sequence than the corresponding discharge in the first cycle, accompanied by the appearance of new features, indicates the possibility of multiple processes taking place in the material.
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