کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5437559 | 1398175 | 2017 | 22 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Electrochemical properties of amorphous GeOx-C composite microspheres prepared by a one-pot spray pyrolysis process
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موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Amorphous GeO2-GeO-C (GeOx-C) composite powders, containing a small amount of the GeC phase, are prepared by a one-pot spray pyrolysis process. The GeOx-C composite powders have a completely spherical shape and are non-aggregated. The Ge 3d components in the XPS spectrum of the composite occupy 53.3%, 40.1%, and 6.6% of the total for GeO2, GeO, and GeC, respectively. The amount of amorphous carbon in the GeOx-C composite powder is estimated at 18.3%, based on the TG and XPS analysis. The initial discharge and charge capacities of the GeOx-C composite powders at a current density of 1 A gâ1 are 1873 and 908 mA h gâ1, respectively. The discharge capacities of the GeOx-C composite and commercial GeO2 powders for the 1200th cycle are 723 and 169 mA h gâ1, respectively, and their corresponding capacity retentions from the 2nd cycle are 70.1% and 19.0%, respectively. The high structural stability of the composite during repeated lithium insertion and desertion processes results in excellent long-term cycling performance.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Ceramics International - Volume 43, Issue 7, May 2017, Pages 5534-5540
Journal: Ceramics International - Volume 43, Issue 7, May 2017, Pages 5534-5540
نویسندگان
Jin Koo Kim, Gi Dae Park, Jung Hyun Kim, Jong Hwa Kim, Yun Chan Kang,