Details

Autor(en) / Beteiligte

• Mei, Yueni
• Guo, Songtao
• Jiang, Yingjun
• Li, Fuyun
• Li, Yaqian
• Hu, Xianluo

Titel

In-situ grown Li-Ti-O layer derived by atomic layer deposition to improve the Li storage performance of Li2TiSiO5 anode materials

Ist Teil von

• Electrochimica acta, 2020-06, Vol.344, p.136149, Article 136149

Ort / Verlag

Oxford: Elsevier Ltd

Erscheinungsjahr

2020

Link zum Volltext

Quelle

Elsevier ScienceDirect Journals Complete

Beschreibungen/Notizen

• Li2TiSiO5 (LTSO) fibers coated by an in-situ grown Li-Ti-O layer are synthesized through ALD and post thermal treatment. Due to the ALD coating technique, precise thickness control and conformal coating layer can be realized. Through post-heating treatment, the ALD-coated TiOx layer can react with lithium residues in the host materials, forming the Li-Ti-O coating layer. Benefiting from the Li-ion conductive feature of the Li-Ti-O phase, Li-Ti-O coated LTSO fibers exhibit a high reversible capacity of 229 mA h g−1 at a current density of 0.5 A g−1 after 400 cycles in the potential range of 0.1–3 V (vs. Li+/Li). Even at a high current density of 5 A g−1, a reversible capacity of 154 mA h g−1 can be achieved. Electrochemical impedance spectra (EIS) demonstrate that the Li-Ti-O coated LTSO fibers have an apparent chemical Li-ion diffusion coefficient of 1.43 × 10−15 cm2 s−1 and decreased charge transfer resistance compared to that of pristine LTSO fibers, leading to faster Li-ion transfer kinetics and improved electrochemical performances. •Li2TiSiO5 fibers coated by an in-situ grown Li-Ti-O layer are realized through ALD and post-heating treatment.•The thickness of the Li-Ti-O coating layer can be precisely controlled by tuning the deposition cycles.•The Li-Ti-O coating layer improves the Li-ion diffusion kinetics and decreases the interfacial charge transfer resistance.•The Li2TiSiO5@Li-Ti-O (ALD-300) electrode delivers enhanced specific capacity and rate capability.