On the Durability of Protective Titania Coatings on High‐Voltage Spinel Cathodes. Issue 12 (12th May 2022)

• Record Type: Journal Article
• Authors: Østli, Elise R.; Ebadi, Mahsa; Tesfamhret, Yonas; Mahmoodinia, Mehdi; Lacey, Matthew J.; Brandell, Daniel; Svensson, Ann Mari; Selbach, Sverre M.; Wagner, Nils P.
• Is Part Of: ChemSusChem. Volume 15:Issue 12(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-05-12
• Subjects: cathode materials -- electrochemistry -- energy conversion -- lithium-ion battery -- sustainable chemistry; Green chemistry -- Periodicals; Sustainable engineering -- Periodicals; Chemistry -- Periodicals; Chemical engineering -- Periodicals; 660
• DOI: 10.1002/cssc.202200324
• Languages: English
• ISSNs: 1864-5631

Abstract

Abstract: TiO2 ‐coating of LiNi0.5‐ x Mn1.5+ x O4 (LNMO) by atomic layer deposition (ALD) has been studied as a strategy to stabilize the cathode/electrolyte interface and mitigate transition metal (TM) ion dissolution. The TiO2 coatings were found to be uniform, with thicknesses estimated to 0.2, 0.3, and 0.6 nm for the LNMO powders exposed to 5, 10, and 20 ALD cycles, respectively. While electrochemical characterization in half‐cells revealed little to no improvement in the capacity retention neither at 20 nor at 50 °C, improved capacity retention and coulombic efficiencies were demonstrated for the TiO2 ‐coated LNMO in LNMO||graphite full‐cells at 20 °C. This improvement in cycling stability could partly be attributed to thinner cathode electrolyte interphase on the TiO2 ‐coated samples. Additionally, energy‐dispersive X‐ray spectroscopy revealed a thinner solid electrolyte interphase on the graphite electrode cycled against TiO2 ‐coated LNMO, indicating retardation of TM dissolution by the TiO2 ‐coating. Abstract : Put your coat on : TiO2 ‐coating of the high‐voltage LiNi0.5‐ x Mn1.5+ x O4 by atomic layer deposition is shown to increase full‐cell cycling stability due to retardation of transition metal ion dissolution and reduced interface formation. The durability of the coating is investigated, as Ti is detected on the graphite counter electrode after prolonged cycling.