Electrochemical Behaviour of Nb-Doped Anatase TiO2 Microbeads in an Ionic Liquid Electrolyte
Artikel i vetenskaplig tidskrift, 2020

TiO(2)is a promising material for high-power battery and supercapacitor applications. However, in general TiO(2)suffers from an initial irreversible capacity that limits its use in different applications. A combination of a microbead morphology, Nb-doping, and the use of an ionic liquid electrolyte is shown to significantly decrease the irreversible capacity loss. A change in the electrochemical response in the first cycles indicates formation of a solid-electrolyte interphase (SEI) or a modification of the structure of the surface layer of the TiO2/Nb microbeads, which apparently stabilises the performance. The change in the response is manifested in an increased charge transfer resistance and the presence of two charge transfer contributions. During prolonged cycling the TiO2/Nb electrode shows an excellent stability over 5000 cycles. Ex situ analysis after cycling shows that the overall microbead morphology is intact and that there are no changes in the crystal structure. However, a decrease in the intensity of the XRD pattern can point to a decrease in size of the nanocrystals building up the microbeads or the formation of amorphous phases.

ionic liquid

TiO2

supercapacitor

Nb-doping

improved stability

Författare

Simon Lindberg

Chalmers, Fysik, Materialfysik

Carmen Cavallo

Chalmers, Fysik, Materialfysik

Universitetet i Oslo

Giulio Calcagno

Chalmers, Kemi och kemiteknik, Tillämpad kemi, Teknisk ytkemi

Adriana Navarro Suárez

Chalmers, Fysik, Materialfysik

Patrik Johansson

Chalmers, Fysik, Materialfysik

Aleksandar Matic

Chalmers, Fysik, Materialfysik

BATTERIES & SUPERCAPS

2566-6223 (eISSN)

Vol. 3 11 1233-1238

Avancerat forskningskoncept för Litiumsvavelteknologi

Energimyndigheten, 2017-02-21 -- 2020-01-01.

Starkt koncentrerade elektrolyter: Celloptimering och Grunder

Energimyndigheten, 2014-10-01 -- 2018-09-30.

Ämneskategorier

Oorganisk kemi

Materialkemi

Annan kemiteknik

DOI

10.1002/batt.202000076

Mer information

Senast uppdaterat

2020-11-05