Effect of Pt and Au current collector in LiMn2O4 thin film for micro-batteries. (18th December 2017)

• Record Type: Journal Article
• Authors: Trócoli, Rafael; Dushina, Anastasia; Borhani-Haghighi, Sara; Ludwig, Alfred; La Mantia, Fabio
• Is Part Of: Nanotechnology. Volume 29:Number 3(2018)
• Publication Date: 2017-12-18
• Subjects: thin film -- LiMn2O4 -- aqueous electrolyte -- lithium-ion battery; Nanotechnology -- Periodicals; Nanotechnology -- Periodicals; Nanotechnology; Publications périodiques; Nanotechnologies; Periodicals; 620.5
• DOI: 10.1088/1361-6528/aa9e33
• Languages: English
• ISSNs: 0957-4484

Abstract

Abstract: The crystal orientation and morphology of sputtered LiMn2 O4 thin films is strongly affected by the current collector. By substituting Pt with Au, it is possible to observe in the x-ray diffraction pattern of LiMn2 O4 a change in the preferential orientation of the grains from (111) to (400). In addition, LiMn2 O4 thin films deposited on Au show a higher porosity than films deposited on Pt. These structural differences cause an improvement in the electrochemical performances of the thin films deposited on Au, with up to 50% more specific charge. Aqueous cells using thin film based on LiMn2 O4 sputtered on Au or Pt as the cathode electrode present a similar retention of specific charge, delivering 85% and 100%, respectively, of the initial values after 100 cycles. The critical role of the nature of the substrate used in the morphology and electrochemical behaviour observed could permit the exploration of similar effects for other lithium intercalation electrodes.