Journal article

Publication year: 2020

Journal: physica status solidi (a) – applications and materials science

Volume number: 217

Issue number: 20

ISSN: 1862-6300

eISSN: 1862-6319

Open access status: Hybrid

DOI Link: https://doi.org/10.1002/pssa.202000382

Publisher: Wiley

Abstract: 
LiCoO(2)thin films are grown by radio frequency magnetron sputter-deposition on platinum-coated Al2O3(c-sapphire) substrates. Deposition parameters such as substrate temperature and the partial pressure ratio between O(2)and Ar are varied to find suitable parameters for a cathode offering reversible intercalation and deintercalation of lithium ions. Structural characterization is carried out using X-ray diffraction and Raman spectroscopy, revealing that the orientation as well as the crystallinity of the deposited LiCoO(2)films can be influenced by varying the O-2/Ar ratio and simultaneously applying a sufficient substrate temperature during deposition. Furthermore, both the atomic composition and the atomic distribution are determined using X-ray photoelectron spectroscopy and secondary ion mass spectrometry. Results show that the films posses surface contaminations of Li and oxygen-rich compounds but have a homogeneous atomic distribution throughout the depth profile. For electrochemical characterization, LiCoO(2)thin films where charged and discharged against lithium metal while using a liquid electrolyte consisting of LiPF(6)dissolved in a mixture of ethylen carbonate/dimethyl carbonate with a molar fraction of 1:1. Reversible discharge capacities in the order of up to 70 mAh g(-1)or 32.40 mu Ah cm(-2) mu m(-1)can be achieved for optimized LiCoO(2)thin films.

Harvard Citation style: Michel, F., Couturier, M., Becker, M. and Polity, A. (2020) Structural and Electrochemical Characterization of Radio Frequency Magnetron-Sputtered LiCoO₂Thin Films, physica status solidi (a) – applications and materials science, 217(20), Article 2000382. https://doi.org/10.1002/pssa.202000382

APA Citation style: Michel, F., Couturier, M., Becker, M., & Polity, A. (2020). Structural and Electrochemical Characterization of Radio Frequency Magnetron-Sputtered LiCoO₂Thin Films. physica status solidi (a) – applications and materials science. 217(20), Article 2000382. https://doi.org/10.1002/pssa.202000382