Binder–Free Nanotubular Hetero‐Structured Anodes of α–Fe2O3 (Hematite) and TiN for Li–Ion Battery. Issue 39 (24th October 2018)

• Record Type: Journal Article
• Authors: Nam, Hochul; Bae, Changdeuck; Shin, Hyunjung
• Is Part Of: ChemistrySelect. Volume 3:Issue 39(2018)
• Page Start: 11027
• Page End: 11034
• Publication Date: 2018-10-24
• Subjects: Atomic Layer Deposition -- Hematite -- Iron Oxide -- Li–Ion Battery -- TiN; Chemistry -- Periodicals; 540.5
• DOI: 10.1002/slct.201801892
• Languages: English
• ISSNs: 2365-6549

Abstract

Abstract: Hematite (α‐Fe2 O3 ) has attracted considerable attention as an anode material due to its high theoretical capacity (1, 007 mAhg −1 ), low cost, and non‐toxicity. The conversion reaction, which often leads to the pulverization of hematite and degradation of electrochemical performances (e. g., capacity retention, high rate capability), is also found in hematite as Fe2 O3 + 6Li + + 6e – → 2Fe + Li2 O. Here, we synthesized nanotubular hetero‐structures using α‐Fe2 O3 and TiN via atomic layer deposition (ALD) without any binders. The initial reversible charge capacity of Fe2 O3 @TiN nanotubes (NTs) was 952 mAhg −1 with a retention of 673 mAhg −1 after 30 cycles. Porous Fe2 O3 NTs with conductive TiN NTs exhibited enhanced electrochemical performances when used as an anode material. Abstract : α‐Fe2 O3 @TiN hetero‐structured nanotubes were synthesized via a template‐directed method together with atomic layer deposition (ALD) and used as an anode in a lithium ion battery. In this work, the microstructure of the ALD‐grown α‐Fe2 O3 @TiN hetero‐structured nanotube electrode was analysed, and its cyclic performance with different wall thicknesses was evaluated. The conductive TiN coating by ALD on the nanotube electrode significantly improved its electrochemical performance.