Atomic/molecular layer deposition and electrochemical performance of dilithium 2-aminoterephthalate

Juho Heiska, Mikko Nisula, Eeva-Leena Rautama, Antti J. Karttunen, Maarit Karppinen*

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

1 Citation (Scopus)
2 Downloads (Pure)

Abstract

Control of the redox potential of lithium terephthalate Li2TP anode material is demonstrated by functionalizing its terephthalate backbone with an electron-donating amino group; this lowers - as intended - the redox potential of Li2TP by 0.14 V. The two Li-organic electrode materials, Li2TP and Li2TP-NH2, are fabricated as crystalline thin films from gaseous precursors using the atomic/molecular layer deposition (ALD/MLD) technique. The amino-functionalized material possesses a previously unknown crystal structure, addressed here by applying the USPEX evolutionary algorithm for the structure prediction and then LeBail fitting of the experimental XRD pattern based on the predicted structure model. The ALD/MLD fabrication yields in situ lithiated active electrode materials without any conductive additivies or binders and thus allows a straightforward evaluation of their intrinsic electrochemical properties. Comparison between Li2TP and its amino-functionalized derivative reveals inferior capacity retention and rate capability characteristics for the latter, which somewhat counterveils the pros-and-cons balance between the two Li-organic electrode materials. From galvanostatic cycling experiments and post-mortem XRD and SEM analysis, the issue with Li2TP-NH2 is revealed to be in the morphology changes occurring during the discharge/charge cycling.

Original languageEnglish
Pages (from-to)1591-1599
Number of pages9
JournalDalton Transactions
Volume49
Issue number5
DOIs
Publication statusPublished - 7 Feb 2020
MoE publication typeA1 Journal article-refereed

Keywords

  • ORGANIC ELECTRODE MATERIALS
  • ANODE MATERIAL
  • CRYSTAL-STRUCTURE
  • THIN-FILMS
  • ION
  • TEREPHTHALATE
  • FRAMEWORK
  • BATTERIES
  • NA2C8H4O4

Projects

Novel hybrid materials by ALD/MLD: from fundamentals towards applications

Aleksandrova, I., Medina, E., Thomas, C., Karppinen, M., Haggren, A., Tiittanen, T., Multia, J., Ghazy, A., Mustonen, O., Khayyami, A., Revitzer, H., Sederholm, L. & Johansson, L.

01/09/201631/08/2020

Project: Academy of Finland: Other research funding

Molecular-Layer-Engineered Inorganic-Organic Hybrid Materials

Hagen, D., Khayyami, A., Marin, G., Ghazy, A., Nisula, M., Johansson, L., Safdar, M., Krahl, F., Thomas, C., Medina, E., Tiittanen, T., Giedraityte, Z., Heiska, J., Lepikko, S., Karppinen, M., Haggren, A., Tripathi, T., Multia, J., Philip, A., Srivastava, D., Aleksandrova, I., Mustonen, O. & Jin, H.

23/12/201324/05/2019

Project: EU: ERC grants

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