کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
185419 459597 2014 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
In-plane Vacancy-Induced Growth of Ultra-High Loading Cobalt Oxide-Graphene Composite for High-Performance Lithium-Ion Batteries
ترجمه فارسی عنوان
رشد ناشی از واکنش درون هواپیما کامپوزیت کربن اکسید گرافن کامپوزیت فوق العاده بالا برای باتری های لیتیوم یون با کارایی بالا
کلمات کلیدی
پیشگیری از اسید سونیک، کامپوزیت اکسید کبالت-گرافین، جابجایی در هواپیما، باتری های لیتیوم یون، بارگذاری فوق العاده بالا
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
چکیده انگلیسی


• Ultra-high loading cobalt oxide (93 wt%)/graphene composite has been successfully synthesized.
• Graphene oxide with induced in-plane vacancies (deGO) is produced through acid-sonication pretreatment.
• Ultra-high loading Co3O4 nanoparticles are in-situ grown onto deGO through a low-temperature hydrothermal reaction.
• In-plane vacancies can induce the formation of Co3O4 NPs with an average particle size of ca. 10 nm.
• Cobalt oxide-graphene composite exhibits a high reversible capacity, superior rate capability and much prolonged cycle life.

Ultra-high loading Co3O4 nanoparticles (NPs) with the particle size of ca. 10 nm anchoring on the acid-sonication pretreated graphene oxide with induced in-plane vacancies (deGO) are in-situ synthesized through a low-temperature hydrothermal reaction. These in-plane vacancies can act as active sites for the formation of Co3O4 NPs since Co2+ ions have a strong bonding effect with the carboxylate groups decorating the defect edge sites, in which nucleation, growth and crystallization of Co3O4 NPs are well separated and confined in a several nanometer region. Although the content is extremely low (7 wt%), deRGO can not only provide a support for anchoring Co3O4 NPs and work as a conductive matrix enabling good contact between them, but also prevent the particle aggregation and keep the integrity of the composite during long-term cycles. The as-prepared deRGO/Co3O4 anode exhibits a high specific capacity and superior rate performance with charge capacities of 727.1 mAh g−1 at 2 C, 559.4 mAh g−1 at 5 C and 70.45 mAh g−1 at 30 C. Meanwhile, no capacity fade can be observed after 100 cycles at 1 C, revealing a stable cycling ability. Therefore this material has great potential application for advanced Li-ion batteries.

Ultra-high loading Co3O4 nano-particles anchoring onto the acid-sonication pretreated graphene oxide with induced in-plane vacancies were applied as the high-performance lithium-ion anodes.Figure optionsDownload as PowerPoint slide

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Electrochimica Acta - Volume 136, 1 August 2014, Pages 330–339
نویسندگان
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