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In-situ grown Li-Ti-O layer derived by atomic layer deposition to improve the Li storage performance of Li2TiSiO5 anode materials
Electrochimica Acta ( IF 6.6 ) Pub Date : 2020-03-28 , DOI: 10.1016/j.electacta.2020.136149
Yueni Mei , Songtao Guo , Yingjun Jiang , Fuyun Li , Yaqian Li , Xianluo Hu

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 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.



中文翻译:

通过原子层沉积获得的原位生长Li-Ti-O层以改善Li 2 TiSiO 5负极材料的Li储存性能

通过ALD和后热处理,合成了原位生长的Li-Ti-O层包覆的Li 2 TiSiO 5(LTSO)纤维。由于采用ALD涂层技术,因此可以实现精确的厚度控制和保形涂层。通过后热处理,ALD涂覆的TiO x层可以与主体材料中的锂反应,从而形成Li-Ti-O涂覆层。受益于Li-Ti-O相的Li离子导电特性,经Li-Ti-O涂覆的LTSO纤维经过400次循环后在 0.5 A g -1的电流密度下表现出229 mA h g -1的高可逆容量。0.1–3 V的电位范围(vs. Li +/ Li)。即使在5 A g -1的高电流密度下,也可实现154 mA h g -1的可逆容量。电化学阻抗谱(EIS)表明,与原始LTSO纤维相比,涂有Li-Ti-O的LTSO纤维的表观化学锂离子扩散系数为1.43×10 -15  cm 2  s -1,并且电荷转移阻力降低,导致更快的锂离子传输动力学和改善的电化学性能。

更新日期:2020-03-28
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