کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1287502 1497988 2013 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Li4Ti5O12 thin-film electrodes by sol–gel for lithium-ion microbatteries
موضوعات مرتبط
مهندسی و علوم پایه شیمی الکتروشیمی
پیش نمایش صفحه اول مقاله
Li4Ti5O12 thin-film electrodes by sol–gel for lithium-ion microbatteries
چکیده انگلیسی

Spinel Li4Ti5O12 has been considered as one of the most prospective anode materials for Li-ion microbatteries. Homogeneous, transparent and crack-free Li4Ti5O12 coatings with thickness around 110 nm have been prepared by dipping gold-coated quartz substrates in sols prepared using titanium isopropoxide and lithium acetate. The influence of the thermal treatment on the phase composition, structure and electrochemical behavior was studied. Rutile TiO2 (considered as an impurity in this study) is only detected in the coatings treated at 700 °C. XPS and TOF-SIMS depth profiles show a homogeneous distribution, with a Li increase and Ti reduction at the surface. Electrochemical characterization of samples treated at 600 °C presents a redox reaction around 1.55 V indicating that the film is simple phase of Li4Ti5O12. The shift to slightly lower voltage in samples treated at 700 °C is a consequence of Rutile impurities. Larger capacity and good reversibility in the sample heat-treated at 600 °C can be attributed to high crystallinity of Li4Ti5O12 and phase purity. RBS analysis specifies a composition close to Li4Ti5O12 in the case of the pristine and charged samples, and Li7Ti5O12 for the discharged sample. Surface XPS study confirms the presence of an outermost layer containing LiF and Li2CO3.


► Homogeneous, transparent and cracked-free Spinel Li4Ti5O12 coatings.
► Influence of thermal treatment on the phase composition and electrochemical behavior.
► Deep structural characterization, including XRD, RBS, XPS and TOF-SIMS.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Power Sources - Volume 244, 15 December 2013, Pages 482–487
نویسندگان
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