锂(药物)
涂层
材料科学
电化学
原子层沉积
阳极
图层(电子)
电流密度
扩散
电极
化学工程
离子
钛
分析化学(期刊)
化学
纳米技术
冶金
物理化学
物理
工程类
内分泌学
有机化学
热力学
医学
量子力学
色谱法
作者
Yueni Mei,Songtao Guo,Yingjun Jiang,Fuyun Li,Yaqian Li,Xianluo Hu
标识
DOI:10.1016/j.electacta.2020.136149
摘要
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.
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